He legitimately sounds very mature and professional. When I was 20 I was a rebellious piece of shit. Genuinely impressed with this guy. He's already gone places, but I see more places he'll be going.
I’m guessing it’s the LCD flex cables at the top of the screen. They heat up and expand causing the intermittent contact. Give them a wiggle to see if the lights come back briefly.
@@creeper2671 Your right. I fixed my 50" TV by replacing the backlight led strip. You need to pull each layer of the screen off and will eventually get to the metal frame holding the led backlight strips.
@@Creptex yes. I did nothing like this, but i seen that on a lot of tutorials. They said that there was no imqge but sound, and with a flashlight, you were able to see a little bit of the image.
@@ilijadimitriev8148 or one or more LEDs could be shorted causing the overcurrent to trip/pulling down the voltage rail and therefore measuring 0 volts.
7:35 Those fractal dust deposits are most likely due to diffusion limited aggregation (DLA). As succinctly as I can describe DLA: dust moves around in the chassis via Brownian motion (somewhat randomly but influenced by other dust particles and air currents). The initial dust "seeds" naturally get stuck to non-smooth edges (in this case, the injection molding ejector pin indents). Additional dust deposits via both physical impact and dust's own electrostatic charge. Since the shape of the chassis limits the dust motion to effectively a 2D plane, any minuscule bump in the initial seed is more likely to get another piece of dust stuck to it than for the new dust to make it past the bump to the center of the seed clump. As this process repeats, the bumps begin forming into arms. Any tiny bumps on the arms may similarly form additional branching arms. You're more likely to see this inside a TV than a laptop because TVs are passively cooled by convection. A laptop's cooling fans push enough air to disrupt the Brownian motion needed for DLA.
dang, was not expecting to learn that much. you explain that well. perhaps the repelling force from the like charge of the dust particles also makes them spread apart like that? just not enough to become disentangled from each other
the ones who failed is never have a try! If he have the right parts he would might get that working again, its uneconomical and not worth it in Australia that why!
I've had similar "fun" with an LG set and I also thought initially that the backlight driver was the culprit (voltage went up for a second on powerup then turned off). However, after some more troubleshooting it turned out some of the LEDs in the strips burned out. Replacing them fixed the backlight issue, so it seems the driver board checks if the backlight is drawing the correct amount of current.
Did this exact repair a couple of months ago, there was no need to mess with the board at all. Out of the top and bottom LED strips, 2 LED's burned out and it made the top and bottom not work, bought replacements and it's working as new. Not saying this might be the case here but since my problem started out the same way as Hugh's one (top illuminated and bottom bit dark) it might be worth to check it.
I had the exact same problem. I replaced the psu unit but gave up after I found out it was the leds. That was too much work and money for a tv that old and cheap :)
Yeah, I also experienced this with a cheap TV from TCL. I took it apart, replaced all the LED strips, and the TV was working again. I did manage to crack the LCD panel taking it apart but part of the image being broken is better than no image at all I guess 😬
The TV world has changed a lot, sadly. 50-70 years ago, TVs were very expensive, and everyone was fixing them. There was a HUGE TV repair market (Especially when they still used vacuum tubes). Up until around 2005-2010 (CRT, most Plasma and many LCD) most TVs were very well documented. Service Manuals were available for anyone willing to pay, even big 1000 page books with schematic collections. Most TV repairmen diagnosed and fixed down to component level. However starting with the 2010s this changed a lot. Instead of Plasmas and early LCDs having sometimes 5 or more boards, now they ALWAYS just contain 2 or 3 (PSU, CPU/Inputs, sometimes TCON). TV repairmen just changed those. However even this is not done often anymore. TVs are not anymore a high tech unit, they became very cheap, and most of the time the cost of a replacement board is more expensive then buying a complete new set. Just think of what would happen if any TV nowadays would cost 2000$ or more - the repair business would probably flourish again. That is also most likely why it still is active in india - people cant afford new TVs, so its worth for them to repair what they have.
The micro soldering shots are indeed super satisfying 😎 Also, there are a few Sony tvs in our local 24 hour gym that have literally been on non-stop since late 2009 and they’re still going strong.
Fun fact: The primary smoothing capacitor stores up to 330V (220√2) or in more expensive units featuring APFC, theese go up to 450V (writing this as I watch the video) The fact that you sat the bottom part of the screen go darker, means that the bottom row of the backlight failed, causing more power to flow trough the top part killing it too, you had to replace the backlight strips, or if you wanted to keep the budget low, replace the old strips with a standard 12V led strip and use the external adapter. (you could go searching on the supply for a suitable rail and building a controll circuitry, but that is quite hard to do. I like the chellange, saved a few monitors and TVs this way.) This happens due to bad cooling on the strips or the manufacturer overdriving the LEDs as the part of "planned obsolecence" or just to get the brighter picture for cheap. No output voltage to the strips was caused by the controll chip detecting the overvoltage on the output (due to the strips beeing open) and shutting down. The scrambled picture is caused by the bad solder joint on the controll circuitry. The LCD displays do not wear out, they can only break or develop "LCD screen cancer" (a lot of dead pixels on one spot). New stuff is never as reliable at the old stuff (newer things are junk).
I always hear the sentiment that "old stuff is much more reliable than new stuff" does that not sound like survivorship bias? I can imagine that there is a bunch of old tech that does not work and the old tech that is "good" is usually because it is one of a few products that survive.
@@aMMMMungus I'd say yes and no. If you are talking about more mechanical appliances, the stuff from 50s until early 80s are more durable, simply because the materials used, QC, not existing an amount of white brands flooding the market, compared to nowadays. You can still get very durable appliances, but you would have to go for professional/commercial level to have the same durability. Also, the cost, a blender back in those days, for example, was way more expensive than today's (inflation adjusted). Now, if we are talking about electronic goods, it's definitely more streamlined and reliable now a days, to a certain extent, but with the cost of not being able to repair it so easily. Now in European Union, brands will have to provide and design more repairable products. I did a work study at university about the planned obsolescence, many of the products displayed by other groups had a good that failed,due to a really cheap nylon or metal parts. Meanwhile, we did a study on a by then 25 year old mixer that was still working perfectly, and couldn't fault any of its components due to the quality of the build and parts. And the funny thing was it filled with old flour and still worked perfectly fine.
@@aMMMMungus No. I mean sure, some of what you say is correct, but there has been a very noticeable drop in the quality of manufacture across the board over the last 30 years. Essentially, everything now is built to a price, and often planned obsolescence is a factor.
Very likely the LED strips. You can buy replacements or make your own using those RGB strips everyone puts on their desks etc but you just need the white one. Nice to see you branching out though.
Most likely, my dad does LED TV repair for living, most of the time replacing the LED strips fixes the problem. But you need to disassemble the screen assembly to replace the LED strip, so you gotta be careful handling it.
@@mindofvirtuoso3358 you can either mod it or replace all the SMD LEDs on the LED strips that comes original with the TV. Replace all with identic LEDs for even white light across the screen
Hey! Huge thumbs up for your efforts to make electronics back to work again. This is vivek from India and yes we Indians do repair our electronics whether it is small or very costly. I request you to please keep trying out new projects as it makes us more engaging to you.
3:25 If you have a J or knife edge solder tip, you should try one of them for reflowing chips. They move a bit more smoothly across the pins letting you tackle each side with 1 nice drag.
Recently I had the same issue with an older LED TV, turned out that the entire backlight was just a series of LEDs, took only one dead one to make the whole thing go dark.
I had a similar issue with a Samsung TV my family bought around 2014 - 2015 in which during 2021 a year ago the backlight and power board were not functioning as intended but I originally thought it was only the backlight. I then ordered the backlight and replaced it but nothing seemed to have worked. Then I replaced the power board and it then worked and the backlight was brighter than before.
Like many others say, you should replace the backlight strips. Fixed my LG this way. It had the same issues like the tv you're shown here. Some of the LEDs failed. If too many of them fail the tv senses it and doesn't turn on the backlit to not burn it up. My LG actually had marks of internal fire. Luckily this safety measure is in place. Replaced all strips and runs fine for two years now.
Would recommend you check in to SOIC desoldering tips for bigger IC removals, or basically those that you can manage to see with your eyes. Less use of the heat gun then, less burn.
I don't know much about TVs and repairs, but from what I watched, did you check if LEDs are working. Because maybe low voltage is due to LEDs not drawing power and failsafe engaging. I am not sure if I will put this correctly but I think on cheaper TVs, LEDs are connected in a way, where one dead LED can cause whole strip to fail, if this makes sense, not sure if it is called parallel or whatever. But I did watch few repair videos on other channels a while ago. And it feels like this would make sense. Sorry, if I confused anything or put it wrongly, as I said, totally not an expert, but it feels like something in those lines could be happening. Also can't really remember how it was tested.
5:50 after 5 years in SMT and through hole assembly, I can explain the glue under the chip. With this being a singe layer board (when produced in these quantities, single layer saves a lot of money compared to dual layer), all the SMT components are attached with a heat setting glue to hold them to the board. After all the SMT components are glued on the boards go to through hole/hand assemble, after all the through-hole (THT) parts are in place, the board is wave soldered with a solder bath, so ALL the SMT parts get washed over with solder which gives them their electrical connection. They have to be glued before wave soldering as, if they were reflow soldered, when the solder bath operation happens, they would literally be washed off the under side of the board.
The capacitor on the PSU (hot side) stores 400v, just so you know, 240 would be too low. Edit: You need to replace the backlight LED strips. But since that’s a difficult and dangerous job to do (done it many times already) it’s not worth it for this cheap set. Get your parents a nice Samsung or LG tv 😉
Flat screen televisions are piled up in recycle facilities, the problem is usually a power supply with swollen capacitors. For around $3.80US in parts, some false confidence from watching TH-cam repair videos, a little patience, and they're usually back in service. The real problem is full featured smart televisions are dirt cheap.
Awesome hugh! TV repair shops are a common thing here in India. We like to keep our devices running as long as possible and discard it only when repair is not a viable option 😅
You aren't wrong about TV repair being so uncommon in the west! My brother and I both brought Sony PVMs in the UK and found a guy with a lot of CRT expereince to get them re-capped...however the repair guy is, so I'm told, one of only 2 English speaking people who knows how to fix them.
Indian people never discard electronics without trying to repair them first. My current tv is 8 years old and has been repaired once and my phone is 5 years old and i got it repaired twice for minor issues, both of them are going strong and still works like new!
Yes. I'm over the moon you did something other than phones. Don't get me wrong you're brilliant at repairing phones it's just good to see something different. Was an interesting video even tho it wasn't a fix.
I am from India..and coincidencely a tv repair technician ...too i can give you a cheap. idea to this problem..In this case to reduce cose we use 'Universal backlight driver' cost around 3 to 4 us dollars in India.. obviously made in china..the connections are simple..if that didnt work..then you have to open the panel and check the led strips behind it...Ok do it just for fun. I always appreciate your videos..
This was a departure and an interesting video. I myself have a 32 inch LG TV that I have connected to my PC, mostly because I repair PCs from home and this particular TV has 3 HDMI inputs as well as a VGA input, so I can run multiple devices at once and use it to test out the functionality of older devices at the same time. Back when I lived in South Africa, we had a Sony TV from the late 1990s which was a CRT, we stopped using it in 2012 or so and replaced it with an LCD TV when high definition channels were becoming more available. Sony have always made really solid TVs.
The power suppplies in these sets almost never die before the LCD panel itself which renders it as a junk. The culprit here are the Backlight LED Strips, even if one or two of them die the whole circuit will break and not work due to the imbalance of Voltages.
Here in Brazil tv repair shops are very common too, 4K tvs here are expensive just to trow it and buy a new one. We try to fix it, sometimes it is an easy fix
I have a 24” Insignia tv, I’ve had it since 2011 and it still works today. Only reason why I still use it is because it has multiple HDMI ports/ AV and Component. Yes newer tvs have multiple hdmi ports but they usually don’t have av and component ports anymore and I still use them on my current tv.
I fix TVs on a regular basis. Nothing to do with the power supply. It's just her backlight. Her name burned for one or two LEDs no more. Open it, lift the screen, go to the LEDs and look for their code with Express owners, order and replace a set and that's it
This happened to me with my 43” 4k tcl, I bought new backlight strips and a main board, tried the easily replaceable main board and it wasn’t that, so I replaced the backlight strips, very carefully, and it worked, make sure you keep track of the backlight diffusion panel order, I had to take my tv back apart and reorder them. I spent $30. I made sure to get the parts from a place that had easy returns, I always do this, it was very helpful when I fixed my fridge and dryer as well, I returned all the boards and fans I didn’t need.
I had the same TV for repair a few weeks ago. It also had no picture. TV was under brand Kruger&Matz (model KM0248). It had broken 3 or 4 LEDs out of 80. Those LEDs are in straps and are connected to two connectors. If even one LED is open or shorted, then one part of the screen (left or right) will not work. In your case, you have problem on both sides. PS. Be very careful with assembling the display, it is very easy to break it.
A shame you couldn’t get it working but serious respect to you my friend! 20 years old. You seem way older and the fact you’ve learnt these skills shows how far I’m this particular line of work you’ve got yet to go. Kudos to your channel and commiserations for your parents TV
I just grabbed a 58" 4K LED TV by the dumpster at my apartment. After a lot of research it seems the t-con board is bad, I ordered a new one for $8. EIGHT DOLLARS. We'll see if that does the trick, but based on everything I found it's either that or the LED strips, which are $50. And a lot of the Reddit posts I found about this problem were just "throw it away and buy a new one." Come on everyone, let's fix stuff. An $8 part is likely gonna keep this out of the landfill and I'll get a sick new TV.
You don't need to be an engineering student.... You really proved age dosen't matter you're only 20 years but more than an engineer, great job Hugh! Love from India Brother!!!! 💜💜💜💜💜
It will be better if they sold dumb but relaible tvs and just buy a tv stick for it. My Sony LCD TV has now almost 9 years, it is dumb and i just run a tv stick. I have had zero problems so far. Great video Hugh, keep them coming. Every day i care more about reparability!
Oh my gosh, you are only 20 years old?!? You are much more skilled that I am, and I am 18, it is amazing that you probably were my age when you did most of the videos that I look up to
replace the led strips power supply shut down cuz no current is drawn from it problem is just one of the led died and as they are all in series all went out chinese tv always overdrive the backlight so it fail easily
I was under the impression back light LED's short out when they fail, and with that thought Is it possible enough of them have shorted out driving the Controller chip into protection mode, essentially limiting the supply to all of the LED Strips usually three to four of them.. But then I am pretty sure some one below has already suggested to replace the LED Strips without going to the details I just provided..
Yes, I have two TV sets from Sony at my home, one from 2009 and another from 2013, and they're still running much better than most random brand TVs (actually all these cheap TVs are most likely made in the same factory, by the same company but under different brands, in China).
Thats the issue when you dont have the necessary materials of knowledge to troubleshoot something. Its hard, even with Bsc in Electronics. Experience comes with personal training and also having the right job to learn. You are doing great, sometimes you need donor parts to repair. Pros may have a board, to test the panel. Or even have similar panels (in case of known brands). But companies want their stuff not to get fixxed easily and the right to repair is our only option. Ps My monitor had problems switching off, but only searching for 10 mins, I found the problem 2 capacitors and its like new, I have repaired an psu for a pc and its still works.
Look bro buy a led strip of 40 W open it up and you'll find an inverter( led power supply) then remove the inverter an apply it to yr tv backlight +to+ and -to - if it has multiple cabels( the tv) open it up and join the tv ledstrips in seri than apply the inverter to the backlight and than plug it in to a wall if it doesn't work turn the +'- kabels around and if it still doesn't respond yr backlight is burt
I've been wondering if it's possible to fix terribly loud humming coming from my TV... But I'm not an expert so I might just end up buying another cheap TV.
I do think you should try to look for the LED backlight as I suspect that it has blown. That was the main culprit of our 32" LG Smart TV and replacing it fixed the issue.
Nice video. I really appreciate the honesty with which you also show content like this. It is not always possible to fix everything and, sometimes, it is not even economically sensible to do so. The motherboard you showed was definitely not the best made and your parents sure love the new Sony TV.
Hey there, love the video. Idk if you'll ever see this comment but I thought I'd leave it here. I worked on LCD/LED TVs for about 3 years (along side computers and phones and such) and have seen this type of issue a lot. Given that half of the backlight was out before they all went out it's possible that the LED strips under the panel are bad. They're not very difficult to replace, it's a procedure I did often, and they're not too expensive either (depending on the brand/model), just a time consuming repair as you practically have to disassemble the entire TV. The LED strips typically contain contact pads that you can inject voltage into to test the bulbs and see which ones went out. A lot of the time, if one LED goes out, it'll take out all the LEDs on it's strip. You can also replace individual LEDs instead of the whole strip assuming you can find them. Maybe for next time you get a TV that has these types of issues lol
change the led striped for those normal led stripes with it's own power supply, so when the lcd dies you can take the power supply back and use it again
I recently did the LED strips in the screen of my 2012 iMac 27" .. wow it was stunning. Because of 3 wires poorly placed and rubbed over time, I had to disassemble the whole back panel to get to it like it was a huge iPhone 5. Yes it now works, but honestly it was not worth my relationship with my girlfriend. (I wrongly accused her of mixing up the LCD's Perspex polarized , opaque & clear light panel layers
One of led strips has died (indicated by dimming of lower sode of the screen) I believe that if circut isn't completed, You won't see any voltage on backlight power. I've fixed few TV's with the same behaviour. Also you can test led's in the strip with multimiter, just put into continuity and check the led swapping the leads between it"s pads, if it glows it is good, after finding the dead led (maybe more than one) you can jump it with the wire without replacing the strip, but it will increase the load on the rest of leds, but as a test you can do it. And be careful with an LCD itself, it is a stront as a potato chip.
Great video! I believe the weird dust patterns on the back of the TV resemble a Lichtenberg figure, it tends to happen on high tension circuits when the capacitor's insulation goes bad.
How many repair shops have disappeared over time due to the cost of fixing than just replacing the broken item for a new one. Its the throw away age now.
8:44 Haha, as you were talking about how dangerous CRT repairs are, I was reminded of ours where we had AV output ports installed on it which originally just came with a COAXIAL out. Because of him, we could use it for another 10 years or so!(1991-2013) He would also repair it when it would break. He was our cable guy!
This reminds me of that one Vizio TV that I fixed up just over two years ago (and it's still working to this day) Ever since then, I've came across at least 3 more TVs that were being discarded that I wanted to try fixing, one being a 60-inch LG 4K TV if I recall correctly, but all of them had broken LCD panels, essentially making them worthless due to the panel's price (unless I wanted a fancy faux-sunlight lamp with them) Modern TVs have always been weird to me; some are cheap, some are expensive, some basic parts are cheap, and the most fragile parts are expensive, they're always awkward to resell, and problematic to dispose of if something goes wrong
Hi Hugh, your backlights are physically fried. they are shorted out which is putting the backlight circuit into protection mode. There may also be other sources of backlight voltage (around 40-60V) you can probably jack from and wire in. Give it a go and see if you can fix it. Take the lcd panel off and replace the faulty leds. each led is 3v, run a couple 9v batteries in series to test each strip.
I'm still using a TV I bought from eBay before COVID-19 shut half the country down. I'm talking about the United States. It has a few minor blemishes on the screen, but my 40" Bravia is like a tank. I'd love to replace it, but since it still works I can't see it as something necessary. So yeah, I kinda get your point about older TV's. Keeping some of them working can be frustrating.
Check the backlight LED strips. The PSU probably just noticed there is something wrong wit the LED strips and cut the voltage. If you don't find suitable LED strips online, measure the LEDs and you might be able to somewhat replace them with common LED chips.
The problem with those tvs is not the PSU backlight circuits, the problem is from the LED Strips, i once recovered a TV from the bin and i've bought an LCD for it, however that LCD had the LED strips faulty so i've replaced myself
Repairing modern LCD TVs is usually not worth it. The components can be more than what the TV is worth (if you can even find them) and there’s no guarantee it’ll last any longer. Unfortunately if something goes wrong its just better to replace the whole thing.
That is a shame that the repair didn't work, but dont think you are the only one that sits there for hours and still makes next to no progress. When i was 20 (millions of years ago lol ), i was determined and rather bloody minded. Not the ideal state of mind lol. I realised that some things were not worth the time or effort. So don't get depressed with a crap design, just show it the skip/dumpster or bin lol.
I have a old (2008-2009ish) Sony Bravia 32 inch. Got it from a closing retail store. It was on for almost all of its life yet it still goes strong with excellent picture quality and no burn-in!
My mothers Vizio LEDs went out. I ordered replacements off eBay. But they didn’t work. I had to get a new tv. The old one is still in pieces. Those specs though. Legacy inputs on UHD!
Pretty sure it is a chip that transcodes video i.e. a video card but this uses a blob solution that keeps voltages in check by keeping it integrated. That means back light = video card. A cheap solution that isn't meant to be repaired. Higher end HDTV have separated boards.
1:03 I have a rule about this, it’s not worth spending more than half of what it’s worth, so if something Is worth $100 And I have to spend more than $50, it’s probably better to buy a new one and keep the rest for parts
I wonder if its actually just the Backlight LED burnt out itself which is actually way more common Especially with the symptoms you explain before where the bottom part is darker
Love from India & small request can you make video of sony hifi system late 2005 series to fix with errors like push to power protect, Effect & standby, or C81
jeffescortix has done quite a few TV repair vids. Maybe reach out to him to see if he has any advice? would be a shame to see this being thrown away, despite being a cheap TV.
My jaw dropped when he said "just a curious 20 year old" legit thought you were 28 or something (in a good way)
I was also mindblown when i found out that he is younger than me.
Same, I though he was closer to his 30's but looking younger thanks to genetics.
Yeah that genuinely shocked me. Holy shit.
He legitimately sounds very mature and professional. When I was 20 I was a rebellious piece of shit. Genuinely impressed with this guy. He's already gone places, but I see more places he'll be going.
"joined 6th July 2011", first tech video 10 years ago "What's inside your laptop"
Replace the backlight LED strips
Here's a tip to make your TV last longer: turn the brightness as low as possible.
That wont help becaude he said the backlight controller was outputting .3 volts
@@manolisgledsodakis873 nailed it
I’m guessing it’s the LCD flex cables at the top of the screen. They heat up and expand causing the intermittent contact. Give them a wiggle to see if the lights come back briefly.
MacBook be like
@@morganb900 yes
On some tvs, i don't remember, you need to dissasemble the screen and change the lamps.
@@creeper2671 Your right. I fixed my 50" TV by replacing the backlight led strip. You need to pull each layer of the screen off and will eventually get to the metal frame holding the led backlight strips.
@@Creptex yes. I did nothing like this, but i seen that on a lot of tutorials. They said that there was no imqge but sound, and with a flashlight, you were able to see a little bit of the image.
Try replacing the backlight LED strips. Theyre usually only about £30 for a decent set and are usually the culprit of backlight issues.
A single bad LED can cause the whole strip to go off. They need to be individually tested.
@@edwardfletcher7790 board dosent give voltage to leds so leds are fine
@@ilijadimitriev8148 I believe there's still multiple heat related problems.
I came here to say this.
@@ilijadimitriev8148 or one or more LEDs could be shorted causing the overcurrent to trip/pulling down the voltage rail and therefore measuring 0 volts.
7:35 Those fractal dust deposits are most likely due to diffusion limited aggregation (DLA).
As succinctly as I can describe DLA: dust moves around in the chassis via Brownian motion (somewhat randomly but influenced by other dust particles and air currents). The initial dust "seeds" naturally get stuck to non-smooth edges (in this case, the injection molding ejector pin indents). Additional dust deposits via both physical impact and dust's own electrostatic charge. Since the shape of the chassis limits the dust motion to effectively a 2D plane, any minuscule bump in the initial seed is more likely to get another piece of dust stuck to it than for the new dust to make it past the bump to the center of the seed clump. As this process repeats, the bumps begin forming into arms. Any tiny bumps on the arms may similarly form additional branching arms.
You're more likely to see this inside a TV than a laptop because TVs are passively cooled by convection. A laptop's cooling fans push enough air to disrupt the Brownian motion needed for DLA.
dang, was not expecting to learn that much.
you explain that well.
perhaps the repelling force from the like charge of the dust particles also makes them spread apart like that? just not enough to become disentangled from each other
Man, I love science
TIL why I see weird dust patterns too
@@videowatcher5931 Computational physics course at university.
@@videowatcher5931 *he spent 7 years beyond the mountains, training with the gods
Much respect for giving it a go!! Can't win 'em all, but at least you try.
He tried but he failed !!!
the ones who failed is never have a try! If he have the right parts he would might get that working again, its uneconomical and not worth it in Australia that why!
I've had similar "fun" with an LG set and I also thought initially that the backlight driver was the culprit (voltage went up for a second on powerup then turned off). However, after some more troubleshooting it turned out some of the LEDs in the strips burned out. Replacing them fixed the backlight issue, so it seems the driver board checks if the backlight is drawing the correct amount of current.
I also had a LG TV we’ve had for about 10 years that gave up same way, just threw it to the curb to make it someone else’s problem
Did this exact repair a couple of months ago, there was no need to mess with the board at all. Out of the top and bottom LED strips, 2 LED's burned out and it made the top and bottom not work, bought replacements and it's working as new. Not saying this might be the case here but since my problem started out the same way as Hugh's one (top illuminated and bottom bit dark) it might be worth to check it.
same happened with two of my LG tvs from 2009 and 2016.
I had the exact same problem. I replaced the psu unit but gave up after I found out it was the leds. That was too much work and money for a tv that old and cheap :)
Yeah, I also experienced this with a cheap TV from TCL. I took it apart, replaced all the LED strips, and the TV was working again. I did manage to crack the LCD panel taking it apart but part of the image being broken is better than no image at all I guess 😬
Check the backlight LEDs. I fixed like 3 TVs from the dumpsters just by replacing it.
The TV world has changed a lot, sadly. 50-70 years ago, TVs were very expensive, and everyone was fixing them. There was a HUGE TV repair market (Especially when they still used vacuum tubes). Up until around 2005-2010 (CRT, most Plasma and many LCD) most TVs were very well documented. Service Manuals were available for anyone willing to pay, even big 1000 page books with schematic collections. Most TV repairmen diagnosed and fixed down to component level. However starting with the 2010s this changed a lot. Instead of Plasmas and early LCDs having sometimes 5 or more boards, now they ALWAYS just contain 2 or 3 (PSU, CPU/Inputs, sometimes TCON). TV repairmen just changed those. However even this is not done often anymore. TVs are not anymore a high tech unit, they became very cheap, and most of the time the cost of a replacement board is more expensive then buying a complete new set. Just think of what would happen if any TV nowadays would cost 2000$ or more - the repair business would probably flourish again. That is also most likely why it still is active in india - people cant afford new TVs, so its worth for them to repair what they have.
The micro soldering shots are indeed super satisfying 😎
Also, there are a few Sony tvs in our local 24 hour gym that have literally been on non-stop since late 2009 and they’re still going strong.
gym tvs are built different
Fun fact: The primary smoothing capacitor stores up to 330V (220√2) or in more expensive units featuring APFC, theese go up to 450V
(writing this as I watch the video)
The fact that you sat the bottom part of the screen go darker, means that the bottom row of the backlight failed, causing more power to flow trough the top part killing it too, you had to replace the backlight strips, or if you wanted to keep the budget low, replace the old strips with a standard 12V led strip and use the external adapter. (you could go searching on the supply for a suitable rail and building a controll circuitry, but that is quite hard to do. I like the chellange, saved a few monitors and TVs this way.)
This happens due to bad cooling on the strips or the manufacturer overdriving the LEDs as the part of "planned obsolecence" or just to get the brighter picture for cheap.
No output voltage to the strips was caused by the controll chip detecting the overvoltage on the output (due to the strips beeing open) and shutting down.
The scrambled picture is caused by the bad solder joint on the controll circuitry.
The LCD displays do not wear out, they can only break or develop "LCD screen cancer" (a lot of dead pixels on one spot).
New stuff is never as reliable at the old stuff (newer things are junk).
100% on point.
I always hear the sentiment that "old stuff is much more reliable than new stuff" does that not sound like survivorship bias? I can imagine that there is a bunch of old tech that does not work and the old tech that is "good" is usually because it is one of a few products that survive.
@@aMMMMungus I'd say yes and no. If you are talking about more mechanical appliances, the stuff from 50s until early 80s are more durable, simply because the materials used, QC, not existing an amount of white brands flooding the market, compared to nowadays. You can still get very durable appliances, but you would have to go for professional/commercial level to have the same durability. Also, the cost, a blender back in those days, for example, was way more expensive than today's (inflation adjusted).
Now, if we are talking about electronic goods, it's definitely more streamlined and reliable now a days, to a certain extent, but with the cost of not being able to repair it so easily. Now in European Union, brands will have to provide and design more repairable products.
I did a work study at university about the planned obsolescence, many of the products displayed by other groups had a good that failed,due to a really cheap nylon or metal parts. Meanwhile, we did a study on a by then 25 year old mixer that was still working perfectly, and couldn't fault any of its components due to the quality of the build and parts. And the funny thing was it filled with old flour and still worked perfectly fine.
@@aMMMMungus No. I mean sure, some of what you say is correct, but there has been a very noticeable drop in the quality of manufacture across the board over the last 30 years.
Essentially, everything now is built to a price, and often planned obsolescence is a factor.
Exactly how i would put it
Very likely the LED strips. You can buy replacements or make your own using those RGB strips everyone puts on their desks etc but you just need the white one. Nice to see you branching out though.
Most likely, my dad does LED TV repair for living, most of the time replacing the LED strips fixes the problem. But you need to disassemble the screen assembly to replace the LED strip, so you gotta be careful handling it.
It doesnt work like that. You need tv LED . The light defuser doesnt support just any white light
@@mindofvirtuoso3358 my 55" Samsung TV with this mod will disagree with you. But you do you my man.
@@mindofvirtuoso3358 you can either mod it or replace all the SMD LEDs on the LED strips that comes original with the TV. Replace all with identic LEDs for even white light across the screen
@@shirufin5928 replacing the single Led would require you to buy new equipment. You can find sets at 30$
Hey! Huge thumbs up for your efforts to make electronics back to work again. This is vivek from India and yes we Indians do repair our electronics whether it is small or very costly.
I request you to please keep trying out new projects as it makes us more engaging to you.
These videos where the fix doesn’t work are probably more interesting than the fixed videos tbh
3:25
If you have a J or knife edge solder tip, you should try one of them for reflowing chips. They move a bit more smoothly across the pins letting you tackle each side with 1 nice drag.
Recently I had the same issue with an older LED TV, turned out that the entire backlight was just a series of LEDs, took only one dead one to make the whole thing go dark.
because they're connected in parallel connection
@@quicksilverb12 i think you mean in series.
I had a similar issue with a Samsung TV my family bought around 2014 - 2015 in which during 2021 a year ago the backlight and power board were not functioning as intended but I originally thought it was only the backlight. I then ordered the backlight and replaced it but nothing seemed to have worked. Then I replaced the power board and it then worked and the backlight was brighter than before.
Hey Hugh, nice to see another electronic device added to the list of types on the channel 🥰
Like many others say, you should replace the backlight strips. Fixed my LG this way.
It had the same issues like the tv you're shown here.
Some of the LEDs failed.
If too many of them fail the tv senses it and doesn't turn on the backlit to not burn it up.
My LG actually had marks of internal fire.
Luckily this safety measure is in place.
Replaced all strips and runs fine for two years now.
Congrats for your soldering skills, you've come a long way. I'd definitely get a bevel tip for your soldering iron though :)
Tv At My House was bought in 1999 And Still Working It's CRT one. Love From 🇮🇳 😊.
Would recommend you check in to SOIC desoldering tips for bigger IC removals, or basically those that you can manage to see with your eyes. Less use of the heat gun then, less burn.
Respect for trying to expand your knowledge Hugh!
I don't know much about TVs and repairs, but from what I watched, did you check if LEDs are working. Because maybe low voltage is due to LEDs not drawing power and failsafe engaging. I am not sure if I will put this correctly but I think on cheaper TVs, LEDs are connected in a way, where one dead LED can cause whole strip to fail, if this makes sense, not sure if it is called parallel or whatever. But I did watch few repair videos on other channels a while ago. And it feels like this would make sense. Sorry, if I confused anything or put it wrongly, as I said, totally not an expert, but it feels like something in those lines could be happening. Also can't really remember how it was tested.
5:50 after 5 years in SMT and through hole assembly, I can explain the glue under the chip.
With this being a singe layer board (when produced in these quantities, single layer saves a lot of money compared to dual layer), all the SMT components are attached with a heat setting glue to hold them to the board.
After all the SMT components are glued on the boards go to through hole/hand assemble, after all the through-hole (THT) parts are in place, the board is wave soldered with a solder bath, so ALL the SMT parts get washed over with solder which gives them their electrical connection.
They have to be glued before wave soldering as, if they were reflow soldered, when the solder bath operation happens, they would literally be washed off the under side of the board.
The capacitor on the PSU (hot side) stores 400v, just so you know, 240 would be too low.
Edit: You need to replace the backlight LED strips. But since that’s a difficult and dangerous job to do (done it many times already) it’s not worth it for this cheap set. Get your parents a nice Samsung or LG tv 😉
Flat screen televisions are piled up in recycle facilities, the problem is usually a power supply with swollen capacitors. For around $3.80US in parts, some false confidence from watching TH-cam repair videos, a little patience, and they're usually back in service. The real problem is full featured smart televisions are dirt cheap.
Awesome hugh! TV repair shops are a common thing here in India. We like to keep our devices running as long as possible and discard it only when repair is not a viable option 😅
Sometimes seeing failure is more useful than success.
You aren't wrong about TV repair being so uncommon in the west! My brother and I both brought Sony PVMs in the UK and found a guy with a lot of CRT expereince to get them re-capped...however the repair guy is, so I'm told, one of only 2 English speaking people who knows how to fix them.
Indian people never discard electronics without trying to repair them first. My current tv is 8 years old and has been repaired once and my phone is 5 years old and i got it repaired twice for minor issues, both of them are going strong and still works like new!
Yes. I'm over the moon you did something other than phones. Don't get me wrong you're brilliant at repairing phones it's just good to see something different. Was an interesting video even tho it wasn't a fix.
Better and better in micro-soldering, too bad about the result but sometimes you can't save money in repair costs. Nice video as always.
If I had to guess, I think the dust inside was like that due to vibrations.
I am from India..and coincidencely a tv repair technician ...too i can give you a cheap. idea to this problem..In this case to reduce cose we use 'Universal backlight driver' cost around 3 to 4 us dollars in India.. obviously made in china..the connections are simple..if that didnt work..then you have to open the panel and check the led strips behind it...Ok do it just for fun. I always appreciate your videos..
This was a departure and an interesting video. I myself have a 32 inch LG TV that I have connected to my PC, mostly because I repair PCs from home and this particular TV has 3 HDMI inputs as well as a VGA input, so I can run multiple devices at once and use it to test out the functionality of older devices at the same time.
Back when I lived in South Africa, we had a Sony TV from the late 1990s which was a CRT, we stopped using it in 2012 or so and replaced it with an LCD TV when high definition channels were becoming more available. Sony have always made really solid TVs.
The power suppplies in these sets almost never die before the LCD panel itself which renders it as a junk.
The culprit here are the Backlight LED Strips, even if one or two of them die the whole circuit will break and not work due to the imbalance of Voltages.
Here in Brazil tv repair shops are very common too, 4K tvs here are expensive just to trow it and buy a new one. We try to fix it, sometimes it is an easy fix
Second
I have a 24” Insignia tv, I’ve had it since 2011 and it still works today. Only reason why I still use it is because it has multiple HDMI ports/ AV and Component.
Yes newer tvs have multiple hdmi ports but they usually don’t have av and component ports anymore and I still use them on my current tv.
I fix TVs on a regular basis. Nothing to do with the power supply. It's just her backlight. Her name burned for one or two LEDs no more. Open it, lift the screen, go to the LEDs and look for their code with Express owners, order and replace a set and that's it
This happened to me with my 43” 4k tcl, I bought new backlight strips and a main board, tried the easily replaceable main board and it wasn’t that, so I replaced the backlight strips, very carefully, and it worked, make sure you keep track of the backlight diffusion panel order, I had to take my tv back apart and reorder them. I spent $30. I made sure to get the parts from a place that had easy returns, I always do this, it was very helpful when I fixed my fridge and dryer as well, I returned all the boards and fans I didn’t need.
I had the same TV for repair a few weeks ago. It also had no picture. TV was under brand Kruger&Matz (model KM0248). It had broken 3 or 4 LEDs out of 80. Those LEDs are in straps and are connected to two connectors. If even one LED is open or shorted, then one part of the screen (left or right) will not work. In your case, you have problem on both sides.
PS. Be very careful with assembling the display, it is very easy to break it.
A shame you couldn’t get it working but serious respect to you my friend! 20 years old. You seem way older and the fact you’ve learnt these skills shows how far I’m this particular line of work you’ve got yet to go. Kudos to your channel and commiserations for your parents TV
I just grabbed a 58" 4K LED TV by the dumpster at my apartment. After a lot of research it seems the t-con board is bad, I ordered a new one for $8. EIGHT DOLLARS. We'll see if that does the trick, but based on everything I found it's either that or the LED strips, which are $50.
And a lot of the Reddit posts I found about this problem were just "throw it away and buy a new one." Come on everyone, let's fix stuff. An $8 part is likely gonna keep this out of the landfill and I'll get a sick new TV.
You don't need to be an engineering student.... You really proved age dosen't matter you're only 20 years but more than an engineer, great job Hugh! Love from India Brother!!!! 💜💜💜💜💜
Bro look what you type half of the spellings are wrong..
@@vashishtmadhur Brother only the word engineering in the 1st line is wrong. And it's a simple typing mistake....
@@sohamghosh6166 its hugh not huge
@@vashishtmadhur ya brother. It's Google keyboard, not me. Better not to type. I turned off the autocorrect option now, thanks for your comment.
It will be better if they sold dumb but relaible tvs and just buy a tv stick for it. My Sony LCD TV has now almost 9 years, it is dumb and i just run a tv stick. I have had zero problems so far. Great video Hugh, keep them coming. Every day i care more about reparability!
I appreciate you also posting your fails! Keep going!
He will keep going, he makes lots of TH-cam money !!!
@@travisash8180 and you are begging for money in roadside.
@@jjoulekelvin2986 He tried but he failed !!!
@@travisash8180 you never tried, so you never succeeded in life.
Oh my gosh, you are only 20 years old?!? You are much more skilled that I am, and I am 18, it is amazing that you probably were my age when you did most of the videos that I look up to
5:15 - Look at "Bb" marking (Cold side of the board)
5:18 - Now that looks like a burn mark
5:27 - Bye bye burn mark
Magic!
You should get some sort of electric drill, don't get carpal tunnel :)
replace the led strips
power supply shut down cuz no current is drawn from it
problem is just one of the led died and as they are all in series all went out
chinese tv always overdrive the backlight so it fail easily
I was under the impression back light LED's short out when they fail, and with that thought Is it possible enough of them have shorted out driving the Controller chip into protection mode, essentially limiting the supply to all of the LED Strips usually three to four of them..
But then I am pretty sure some one below has already suggested to replace the LED Strips without going to the details I just provided..
Yes
i tried to repair a similar model of this, it electrocuted me 3 times and the capacitor of the power supply exploded
Here in India you get almost anything repaired from local repair shops!! Which if malfunctions again the same shop might cover it!
Maybe I’m imagining it but Onyx seems familiar. I’m not thinking of the Pokémon.
Its like shooting in the dark.
Yes, I have two TV sets from Sony at my home, one from 2009 and another from 2013, and they're still running much better than most random brand TVs (actually all these cheap TVs are most likely made in the same factory, by the same company but under different brands, in China).
Your 20 years old?????
I dont know why but i taught you were 18 at max😂😂😂😂😂
Thats the issue when you dont have the necessary materials of knowledge to troubleshoot something. Its hard, even with Bsc in Electronics. Experience comes with personal training and also having the right job to learn. You are doing great, sometimes you need donor parts to repair.
Pros may have a board, to test the panel. Or even have similar panels (in case of known brands). But companies want their stuff not to get fixxed easily and the right to repair is our only option.
Ps My monitor had problems switching off, but only searching for 10 mins, I found the problem 2 capacitors and its like new, I have repaired an psu for a pc and its still works.
Look bro buy a led strip of 40 W open it up and you'll find an inverter( led power supply) then remove the inverter an apply it to yr tv backlight +to+ and -to - if it has multiple cabels( the tv) open it up and join the tv ledstrips in seri than apply the inverter to the backlight and than plug it in to a wall if it doesn't work turn the +'- kabels around and if it still doesn't respond yr backlight is burt
If ur backlight is burnt it will allsow not trigger the power supply to turn on the tv backlight voltage
Had the same problem with my brother's TV. Replaced the backlight LEDs and it came to life
I've been wondering if it's possible to fix terribly loud humming coming from my TV... But I'm not an expert so I might just end up buying another cheap TV.
Replace the mainboard humming will go away
Hugh's dad 'it was working fine before you took it. You can pay for the new one!'
I do think you should try to look for the LED backlight as I suspect that it has blown. That was the main culprit of our 32" LG Smart TV and replacing it fixed the issue.
I have a Sony Bravia tv r350b from 2013 and its still doing well.
first
I am guessing this tv company from our country India not sure hard to find any part
Nice video. I really appreciate the honesty with which you also show content like this.
It is not always possible to fix everything and, sometimes, it is not even economically sensible to do so.
The motherboard you showed was definitely not the best made and your parents sure love the new Sony TV.
Hey there, love the video. Idk if you'll ever see this comment but I thought I'd leave it here. I worked on LCD/LED TVs for about 3 years (along side computers and phones and such) and have seen this type of issue a lot. Given that half of the backlight was out before they all went out it's possible that the LED strips under the panel are bad. They're not very difficult to replace, it's a procedure I did often, and they're not too expensive either (depending on the brand/model), just a time consuming repair as you practically have to disassemble the entire TV. The LED strips typically contain contact pads that you can inject voltage into to test the bulbs and see which ones went out. A lot of the time, if one LED goes out, it'll take out all the LEDs on it's strip. You can also replace individual LEDs instead of the whole strip assuming you can find them. Maybe for next time you get a TV that has these types of issues lol
change the led striped for those normal led stripes with it's own power supply, so when the lcd dies you can take the power supply back and use it again
Change The Backlight LED
I recently did the LED strips in the screen of my 2012 iMac 27" .. wow it was stunning. Because of 3 wires poorly placed and rubbed over time, I had to disassemble the whole back panel to get to it like it was a huge iPhone 5. Yes it now works, but honestly it was not worth my relationship with my girlfriend. (I wrongly accused her of mixing up the LCD's Perspex polarized , opaque & clear light panel layers
One of led strips has died (indicated by dimming of lower sode of the screen) I believe that if circut isn't completed, You won't see any voltage on backlight power. I've fixed few TV's with the same behaviour. Also you can test led's in the strip with multimiter, just put into continuity and check the led swapping the leads between it"s pads, if it glows it is good, after finding the dead led (maybe more than one) you can jump it with the wire without replacing the strip, but it will increase the load on the rest of leds, but as a test you can do it. And be careful with an LCD itself, it is a stront as a potato chip.
Great video! I believe the weird dust patterns on the back of the TV resemble a Lichtenberg figure, it tends to happen on high tension circuits when the capacitor's insulation goes bad.
How many repair shops have disappeared over time due to the cost of fixing than just replacing the broken item for a new one. Its the throw away age now.
The problem are the LED behind LCD. You need to replace them.
8:44 Haha, as you were talking about how dangerous CRT repairs are, I was reminded of ours where we had AV output ports installed on it which originally just came with a COAXIAL out. Because of him, we could use it for another 10 years or so!(1991-2013) He would also repair it when it would break. He was our cable guy!
Interesting video Hugh, fun to watch along 👍
Great stuff Hugh. Bugger it didn't work out in the end, but all part of the learning experience, so kudos for attempting it. Thanks for sharing Mate.
This reminds me of that one Vizio TV that I fixed up just over two years ago (and it's still working to this day)
Ever since then, I've came across at least 3 more TVs that were being discarded that I wanted to try fixing, one being a 60-inch LG 4K TV if I recall correctly, but all of them had broken LCD panels, essentially making them worthless due to the panel's price (unless I wanted a fancy faux-sunlight lamp with them)
Modern TVs have always been weird to me; some are cheap, some are expensive, some basic parts are cheap, and the most fragile parts are expensive, they're always awkward to resell, and problematic to dispose of if something goes wrong
This. Tv. Repair. Didn’t. Go. The. Way. I. Wanted it. To
i wouldnt pay 500bucks for this even brand new more like 180-240
Hi Hugh, your backlights are physically fried. they are shorted out which is putting the backlight circuit into protection mode. There may also be other sources of backlight voltage (around 40-60V) you can probably jack from and wire in. Give it a go and see if you can fix it. Take the lcd panel off and replace the faulty leds. each led is 3v, run a couple 9v batteries in series to test each strip.
I'm still using a TV I bought from eBay before COVID-19 shut half the country down. I'm talking about the United States. It has a few minor blemishes on the screen, but my 40" Bravia is like a tank. I'd love to replace it, but since it still works I can't see it as something necessary. So yeah, I kinda get your point about older TV's. Keeping some of them working can be frustrating.
Check the backlight LED strips.
The PSU probably just noticed there is something wrong wit the LED strips and cut the voltage.
If you don't find suitable LED strips online, measure the LEDs and you might be able to somewhat replace them with common LED chips.
Yoo
The problem with those tvs is not the PSU backlight circuits, the problem is from the LED Strips, i once recovered a TV from the bin and i've bought an LCD for it, however that LCD had the LED strips faulty so i've replaced myself
You can't win them all but it was a great attempt.
just buy an backlight tester for TVs/monitors. Also going randomly testing componentes on a board is a waste of time.
Repairing modern LCD TVs is usually not worth it. The components can be more than what the TV is worth (if you can even find them) and there’s no guarantee it’ll last any longer. Unfortunately if something goes wrong its just better to replace the whole thing.
That is a shame that the repair didn't work, but dont think you are the only one that sits there for hours and still makes next to no progress.
When i was 20 (millions of years ago lol ), i was determined and rather bloody minded.
Not the ideal state of mind lol.
I realised that some things were not worth the time or effort.
So don't get depressed with a crap design, just show it the skip/dumpster or bin lol.
I have a old (2008-2009ish) Sony Bravia 32 inch. Got it from a closing retail store. It was on for almost all of its life yet it still goes strong with excellent picture quality and no burn-in!
u can change the back light led it could work because sometimes only the led fail or broke
My mothers Vizio LEDs went out. I ordered replacements off eBay. But they didn’t work. I had to get a new tv. The old one is still in pieces. Those specs though. Legacy inputs on UHD!
Pretty sure it is a chip that transcodes video i.e. a video card but this uses a blob solution that keeps voltages in check by keeping it integrated. That means back light = video card. A cheap solution that isn't meant to be repaired. Higher end HDTV have separated boards.
1:03 I have a rule about this, it’s not worth spending more than half of what it’s worth, so if something Is worth $100 And I have to spend more than $50, it’s probably better to buy a new one and keep the rest for parts
I wonder if its actually just the Backlight LED burnt out itself which is actually way more common
Especially with the symptoms you explain before where the bottom part is darker
Love from India & small request can you make video of sony hifi system late 2005 series to fix with errors like push to power protect, Effect & standby, or C81
jeffescortix has done quite a few TV repair vids. Maybe reach out to him to see if he has any advice? would be a shame to see this being thrown away, despite being a cheap TV.