Samsung TV Main board was bad. Here's how I figured it out. Model # UN32EH5300FXZA.
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- เผยแพร่เมื่อ 19 ก.ย. 2017
- www.tvrepairinfo.com/ The television I repaired in this video is a Samsung UN32EH5300FXZA. I had mis-stated the model number in this video so please take note. This TV came in my shop dead. My first guess was bad LEDs since I see this so often, but it turned out to be a bad main board. One common characteristic of a defective main board is that if the TV does happen to turn on at all, and you press the power off button often times the TV doesn't respond and remains on. One other thing that surprised me about this particular model was that unplugging the main board allowed the back lights to come on. Normally the power supply doesn't turn on unless it gets a 5 volt turn on voltage from the main board, but on this model unplugging the main board did enable the back lights to come on.
![Help! My TV Keeps Restarting! - 58" Scamsung LED TV Panel Driver Board Complex Repair [Video 11]](/img/n.gif)
Thanks for going into detail explaining why and how everything works. I'm working on a different tv but the answer I was looking for I found in your video because of your explanations as you went. Great video
Thanks! This video and mention of Shop Jimmy led me to replacing the Main Boarding my Samsung that got fried through HDMI when my cable box was hit with a coax surge. So nice to have my 55" Samsung back!
My samsung leds are fine and the flashlight test have picture. The backlight just doesn't turn on with the tv?
good info
Excellent video and thanks a million for your amazing work and support, it's been a long time since I last repaired one of them but great to see you working on them and not many other do it now so thanks again for everything 👍
Another good bit of information .Thank you.
I can remember a time where I could make a living in tv repair. Times change people need to keep with the times and have these crappy flat screens , surprised you could even find the boards for it ! Thanks for the heads up Dave !
Yea things have certainly changed in the TV repair business. Many repair shops have closed their doors, and the remaining shops have had to branch out and find additional kinds of work. to pay their bills. I'm no exception.
Grants Pass TV Repair I closed the business
If it weren't for home service calls doing simple hook up and correcting user mistakes, plus TV antenna sales and installations I'd be forced to close my doors. With winter on the way it's going to be interesting to see how I survive.
i would like to have some classes in this subject, also if i'm not native speaker. Maybe some pay classes could be an idea for winter=) PS: hope you passed it nice and worry less
I am happy we have those "crappy flat screens". Thinking about those analog p.o.s. we used to watch back in the day still makes me ill.
When you disconnected wire to mainboards from powerboard ,back light will on, you will know is not backlight problem , it cool, 5star for Samsung have this function 👍👍👍👍👍.
Thanks for the video. I wish there was an excellent definitive book on modern tv repair. I've looked and found nothing so far! If they can design these boards, why can't they produce repair manuals? I realize the tv's are fairly inexpensive now, but I would prefer to fix things when 99% of it still works.
Thank u for ur explanation. I'm a electronics technician myself and open to any helpful subsection u may have in fixing these TV's. That's again for the information. 👍👋👋
Great video ultra helpful!
So what part was really rong with it was it the main board or the power . Supply board.?
Thanks for posting this video, I’m dealing with the same kinda issue, in my case, my Samsung 4K tv wouldn’t fully turn off, it would turn off then turn back on seconds later, the remote became unresponsive, and my only temporary fix was to unplug it, but even then the tv would turn itself on again. The TV is not even 3 years old and I spent a lot on it so I felt like my only option was to have it fixed.
This sounds like my tv. Keeps power cycling. Plug it in and it acts like its turning on lights up for a few seconds the shuts off and blinks red power light twice. Do you know how it was fixed?
@@stevensheffey731 sounds like a bad motherboard. In my situation, I had an older Monster Power center that these newer TVs didnt like, caused my Samsung's motherboard to go, I end up having it fixed, then sold it. Plugged my Sony OLED into the same Power Center, had the same issues. After having to have Geek Squad come out and swap the mother board (luckily under warranty), I had mentioned the only common denominator was the power center, they said they had never heard of an issue like that ever happening. They fix my Sony, I plug it back into the Power Center, and guess what? Immediately started to have the same issues, long story short, I gave the Power Center away to a coworker but warned him about it.
@@damianw41 oh wow crazy. Ya I ought a replacement power supply board thinking it was a power issue as this particular TV uses a One Connect box (googling it will pop up a ton of probs of it failing). Replaced the board but didn't fix the issue so the only other thing I could do is replace the main board. Replacement part still on the way. Will share how everything works after I install. If it doesn't work ill have to sell it for parts :(
@@stevensheffey731 hey did you ever end up installing the main board you ordered? My Samsung is having the same issue.
@@sonsetsfree hey sorry I forgot to respond. So ended up replacing the main board (the green one) and everything works perfectly now. Super happy I was able to save the TV as i spent over 3k on it.
Sorta new to this but how do you check the voltage? What pins do you put the POS and NEG leads on to see it? And I’m guessing the TV should be plugged in while you’re doing this?
Honestly it sounds more like a power board issue. Why else would both mains work suddenly unless the culprit being a intermittent issue with power board..? Plus consider your issue with standby voltage.
Thanks for sharing
Great explanation
I miss the component level troubleshooting days of electronics lol
Me too. It was often far more fun than any board game, and schematics were far easier to find and understand.
For sure! We have a complete shortage of troubleshooters in most fields now and we have a brainwashed, throw it away society to add to it. Who cares how it works" throw it out and get a new one!
the problem is spare parts, i have a f9000 samsung with mainboard gone, but i can't find no new one neither refurbished one. So probably have to sold 55" panel and buy new tv
if your into laptops, apple laptops, search Louis Rossmann on YT. but any channel who openly tell their aprouch and asumbtions are intresting to me :D this one definitly is cool too :D
@@SilvanoP I have the 65 f9000 series also. Has the one connect box, ugh.. Wish they never had that. But it shows the SMART HUB screen then goes black. Then repeats that over and again. Without the one connect box plugged in, the screen stays lit fully on the part that asks you to plug in the one connect. Everyone having this issue. Must be a mainboard issue.. Gonna try to see if a cap is bad or a ribbon or pin burnt to guide me to what could be the issue. Any help from anyone I would be blessed to have. Thanks. Awesome video..love them
These tv are only 0.5 V on stand by on a regular basis
the small 50V 47uf cap and larger 16v 1000uf cap is what usually goes
Also to test the Led on this tv its as easy as unplugging the main board and leave he PS board plugged in all Led's with light
Pulled one out of the trash yesterday in like new condition and had it fixed within 10mins of finding it had the same issue no sign of life what so ever ,, Works great now
Excellent video! I am having almost the exact same issues with my Panasonic TC-39AS530U. TV turns on, screen flickers 3 times (I can see the LED lights flickering in the back), then I get a blank screen with 1 LED flicker (error code 1 I assume) then just a slowly blinking red LED. There is no sound and I can't turn it off with the remote. I have to press and hold the power button on the side of the unit or unplug it to turn it off. I have tested my power supply board. ALL 3 test points (standby, LED driver, and main board) maintain voltage when it goes from power on to blinking light. However, the pins on the connector for the main board and driver board go from 16V and 24V respectively down to 0 when the light starts to blink.
There are 3 test points on the main board, 5.3V, 12V, and 15V. The 5.3V (standby) maintains voltage when it goes from power on to blinking light, the other two do not, they go to 0. Would that, along with voltages being maintained on the power supply board, indicate that this main board is bad? I really hope that is the case as I do not want to get into replacing LED strips. Thanks and keep up the great work! P.S. I have put in new power supply and T-con boards and the problem continues.
I'm in the dying field of after market TV repair and happened to pick up on what you said; "You KNOW it's the main board - but replaced all three"? But the power supply was low output on all legs. I Didn't hear you say that you unplugged the power supply cable to the main board to isolate it from the power supply (divide and conquer technique). God bless you for making a video and explaining you can get all three for $50.00. You're leaving a lot to the imagination of someone who stumbles upon this video though. 51% thumb up (for the effort).
Some of my videos are not ideal, but I figured listing the voltages might be helpful to some. As you probably know TV repair is a lousy business now. That's why I've resorted to mostly doing home service calls for hookups, customer errors and TV antennas. All the best.
@@GrantsPassTVRepair I liked your comment about "he wanted it repaired anyway". That part is very true. Once in a while I get a TV that's just out of warranty, that's still going for over a grand, those are bread and butter right there (customers will pay 800 to save 300). All flat screens are like what your video shows. Like it - you're educating folks, I can appreciate. thanks man
Your welcome. After a TV has a few years on it I often tell my customers it's best to replace it, and they end up hiring me to hook their new TV. There were a few instances where I'd attempt to repair a TV I didn't think was a good investment for them, and sometimes it seemed to backfire on me.
@@GrantsPassTVRepair I still have my B&K picture tube rejuvenator from the old days, a huge library of old newstock mostly RCA tubes. Sitting there waiting for the right job. Government put my analog out of business overnight.
Yeah I try to over-bid the TVs unless it's a really nice one, then I try to help. Rarely burned since 92, but I had to eat some before. Par for the business. I'll subscribe to your channel. Pleased to meet you.
@@OnHoldAt50 Likewise. All the best.
Brother, I feel your pain.
All black people love this bro bra name
I own a Olevia 42 hd lcd tv that still produces a beautiful picture. The sound just went dead just the other night and I can't get any volume out of it. I have tried a number of things to see if my setting were wrong but still no sound. Can I get any input from you.I would deeply appreciate it, I'm on a very tight budget right now and can't get a new one.
What's a good place to get diagnosing help? I have a tv that I can't find schematics for
I have a Samsung 40" TV that started having some kind of noise and green screen once in a while. After some time, the problem started getting worse. After reading some info on internet, I decided to change some ICs and tantalum capacitors on the main board. Now TV does not turn on, but I see the classical blinking red LED forever, and the TV does not start. I took some measurements on the connector between mainboard and power supply, and they are more on low side (ex: instead of 5.3V, I get 4.99V; instead of 13V, I set 12.5V). I checked the main capacitors (dissoldered them and measured with LCR meter), and they are good. Would this little voltage difference be an issue or it within the accepted tolerance? Also, when I disconnected the main board from the power supply, I did not see the backlight turning on. Which board appears to be faulty in your opinion?
Isnt all you would have to do is unplug main board and see if voltage goes back to 5v?
Hi I have a Samsung un50h6 and the screen went black with audio. Replaced the tcon board and didn't get any results...pulling the ribbons did nothing...then I noticed that only two LEDs in tcon were lit......I then unhooked the wifi from the main board to fully lift of the back panel and then everything went out! The backlights and the tcon lights?? Any ideas?
Thanks Dave.
So what about horizontal lines? I have an Oled panel, I tried replacing the power board and that did not fix, I was told the power board was fine. My red light goes off then back on but before that when it turned on it had horizontal lines so I suspect that is bad display panel?
Very nice sir
Hey, anyone know where I can get a main board? To replace a toasted one? Thanks...
Just one question, I have and 2012 Philips 47 inch led tv, and I am not happy with the static contrast ... If I buy and Android TV box, could give me a better picture quality? Or could I replace the motherboard from a newer generation tv? Makes any sense? Thanks
I have Samsung TV UN 39FH5000 FXA that don't have backlight also when plugged in power stand by light flashes 6 times. I was measuring voltage on wires to backlight and got different reading when main board connected to power supply board reading goes to zero, but when main board disconnected, reading is 193V on connector D+ but when I measure voltage on wires from mainboard to power supply board voltage is as noted on power supply board. can you please advise what to change to fix it?
Hello i have Thomson 40FZ5533 model TV with burned main board, the board that i buy is the same 40-MT51SS-MAC2HG but it's from tv that is 48FZ5635 model , the serial number of the boards is the same but the board its slightly diferent from mine, can my tv works with the other board ?
Check the cable from the supply unit to the main board. My 55 inch Samsung burnt out 2 of the ribbons. Replaced the entire ribbon cable and fixed the problem. Don’t recommend it though as it just covers up the initial problem instead of solving it
Me too. There was an official service update about this fault. The act of unplugging and replugging the cable probably cleaned it up enough to get the old board working temporarily.
Hello, I have a problem where my Sony Model: KDL-65W850C
Keeps randomly rebooting on its own, weird thing is that I cannot reset or hard reset it, neither on settings or by forcing it (Holding Volume down + Power until green light appears). Nothing works to start it fresh. Anyway you can tell me if there's a way to check if its the power supply or the motherboard?
Thank you for your help!
I know this is a late comment but your video gave me some insights. I have a UN46EH5000 with no back-lite. I fix PCs all the time but sticking my paws into the back of TV would be something new. Thanks for you layout of your trouble analysis...
So what is your hypothesis as to why the old main board started working again, loose grounding screws?
To be honest I have no idea as to why the short went away.
@@GrantsPassTVRepair honest reply
That IC could have had a transient hang up, and when the cables were removed it reset.. Possible bad solder on the IC too, if its a bga....
With the Samsungs Series C and later you just have to pull the plug to the main board to start the power supply fully, including the backlight. If that works ok, it's the main's fault. Pretty clever, actually. Samsung has the opposit signal level (0V, low) for power supply activation compared to other brands.
Yes seeing the backlight come on after I pulled the wiring harness was quite a surprise. I forgot the put that in this video.
My tv doing same thing everything works except backlights wont turn on with power
thank you very much
Muito bom irmão
Now if the screen is rated for 120hz/120fps but States that it just lacks support than would forcing 120hz with a PC graphics card work?
sony tv kdl46nx711 turning on and off every two seconds no red lights. replaced powerboard that didn't fix it should I replace the mainboad.
Very good video
Could you answer me a question. In the connection are the same, power to board the same and size. Can you swap the main board to another manufacturer with out issue?
No. You need to use the exact match for your TV.
i, need advise , i have a Samsung LA40B650. bought it second hand an it died 1 days later. power turns on with a music an turns off the same but no picture after that just blank. i tried to unplug from the switch few times an plug back it gave a turn on kind very mild light for a sec an turns black again. after few tries it turned on for 10 mins an went to the source page but died after 10 mins.. need advise if i can fix it.
my 40" Samsung smart Tv works fine but the HDMI ports , any ideas ? Thanks
Thank you for this most informative video. I am trying to troubleshoot a Samsung Plasma that has a defective HDMI circuit. When any HDMI device is plugged into to either port, there is a great deal of static on the screen and the picture blacks out for a second every minute or so. Very frustrating. This all happened after a nasty lightning strike that hit nearby. Do you know if the HDMI circuit is on its own board that can be easily replaced?
I don't know enough about your TV to help you on your question.
Did you find out if the hdmi ports are part of the main board?
bdo there is white cloud in my lcd tv 32 iches upside down...why is it? remaining space of lcd tv is fine....but we cant see on cloudy area
My Qwerty remote cannot power off my Samsung. The red power light flickers when pushing power off.
Wondering if u can help me out . My tv has blinking red light when u turn it on. U can hear it turn on and there’s sound too just no picture . I think the LED is fine because it does occasionally turn on and it stays on for hours it just seems to have a power issue like it’s struggling to turn on. Capacitors look fine on the PSU. I would assume main board is fine if it’s “recognizing to turn on”like u said . Any thought ?
Sounds like the back light or t con bored
Hey look, there's a SCART header on that board. I guess they use one board for both markets,
But quick question I have a Samsung 75 inch series 6 when I hit the power button the TV turns on the Samsung logo turns on then it lights up number three and then it goes to a blue screen and then it doesn't do nothing else I took the TV apart and now I'm trying to figure out what's the problem thank you let me know thank you for all your help
I Have a Samsung UN40ES6003FXZA I replaced the LED backlights because I was getting a black screen, but I could see images on the screen with a flashlight, I replaced the backlights and it works, but the screen isn't bright for some reason. I kinda believe it's a main board issue. Any way I can test the main board?
Nice video!! I have a UN55JS700F. When you turn it on, it just clicks on and off! No picture!
Good day, ive watched the video and i have the same problem with a Samsung UA70TU7000K and the power board has a voltage less and when you try to turn the set, a RED light flickers non stop. Can you please help
I need to know where you get the parts from?, Please . Thanks
I have purchased parts from many different places. Digikey is the company I use the most for individual components such as capacitors, resistors and transistors. but when I'm looking for a replacement board I like to use Shop Jimmy when possible since they have a good reputation. Sometimes I use ebay for replacement boards, but I've found some of the sellers there are dishonest about the condition of their boards. If you go to my website at www.tvrepairinfo.com you can scroll down the list and find other companies I also buy from.
Hi i have samsung 22" Tv logic board fully burned out. psu ok iam try to install universal Led board. how to on ccfl back light with that psu. Can i BLU_ON short to gnd
Change main board ... tiene power board and system protection i was the tb off
Hi, thanks for all your greate videos. I need your help please with my Philips Tv (37PFL5604H/12). TV only shows a red light blinking 3 times every 2 seconds. A curiose thing is that when i do the manual software upgrade (reconnecting the TV to the Mains/AC Power while pressing "ok" button) the tv starts to work perfectly. The problem is that every time i turn off the TV the blinking red light returns, and the tv will not work again till i install the software again. Thank you very much.
Possible bad ERPROM
I have a tv that feels hot in the same location you pointed out here on the ic main board and sometimes if i touch the tv on the outer metal frame i can feel a small shock or pinch. Not to mention the tv completely freezes on any given image and turns off after the frozen image then turns back on again. What would you recommend? This same work? i got this really nice Samsung TV un55es8000 for $80 I believe due to this issue but its almost in new condition and the price was a steal, wouldn't want to loose it. Again what would be recommended?...Thank you for the video as well. Appreciate any help thanks.
I can't guess at the problem, but many parts run hot by their very nature, and that's not necessarily a problem unless the part is shorted or malfunctoning.
I have red light stand by and the tv wont turn on so what your saying is the main green logic board is bad? Or main power supply board is bad?
I can't tell you which one, but if I had the TV in front of me I'd be checking to see if the power supply is getting an enable voltage from the main board. The enable voltage tells the power supply to turn on. The enable voltage terminal on the power supply might be called PS on, On, or power on, and it's often 5 volts.
Hello, i have a situation where lightning struck my samsung that uses bn44-00715a power supply. When I plugged it in the backlight came on automatically. I was checking voltages then plugged in the main board and it toasted the ic206 chip. I'm wandering if there is anyway to tell if the led panel is fried before I purchase power supply and main board? Thanks. The standby voltage is always 13vdc. I know I should have stopped and changed the power supply first but I screwed up. Now the backlight doesn't come on like it was although I have dc voltage going to it. I'm not sure what the voltages should be.
One never knows how bad the damage is when Lightning strikes a TV, But I would think your panel might have survived since it isn't the first in line to get zapped. I'd be suspect of the main board and power supply.
Grants Pass TV Repair Thanks for the reply. My concern was now I plug the power supply in, the backlight doesn't come on anymore. I have dc voltage going to the ribbon though. The model number is un46h7150afxza (samsung). I'm sure the power supply has issues because I unplugged everything other than the led ribbon and it lit up(until I fooled with it). Do you think it's worth spending $250 on power supply and main board?
Since the power supply is generally the first circuit board to take a hit from lightning, I would suspect it may have a problem, and the other boards could be okay, but that's just a guess. Sometimes a lightning strike through the AC cord is so strong, it may have effected other boards as well.
Thanks for the video. My Eurostar smart tv motherboard is faulty. Would I be able to buy any motherboard to at least get the TV to work?
You might call shop jimmy and ask them if they have your board available.
Will a Samsung 55RU7172 motherboard work in a 50RU7172 TV?
You mention the place where you bought boards but I could not catch the name of the company could you give me this information?
I believe it must be shopjimmy.com. It looks like an electronics supplier.
shop jimmy
I have a question for you. I have the exact same TV and have no picture or sound ,but the red LED on the front will flash 5 times then pause and repeat. Once in a while the screen will flash a very faint white but you need to have the lights turned off in the room to see it. I checked the voltages like you did and have 3.2V on pin 14. I also found out if I disconnect the main board from the power supply board the back lights come on. If I replace the main board do you think this will fix the problem?
Your diagnosis sounds like a good possibility.
I replaced the main board and it fixed the problem. Thank you very much.
Thanks for the update on your success with this repair.
New LCD or LED TV depending on size could be as little as $150 to $300, but the power supply board alone is listed for $212-$331 + the labor charges are additional. This is what we call mind boggling.
He got all 3 for $50
hi...pltease can you hep me to find this part ....
ELETECK E254881 AWM STYLE 21016 26AWG 105C 300V 20 pin
i'm about to go on ebay to repair an lg LG 27UK600-W that has weird lines and artefacts on the screen should i replace the main board or is it the t con board? thank you
I don't know, but it could be a bad display panel also.
My tv works fine with no problem but it have a single issue, it performs some unnecessary functions with other devices remote like, set up box, other tv remots, AC remote, just take an example, whenever i change my channel with set up box remote, volume of tv increasing simultaneously, when i try switch to channel 4 with set up box remote then simultaneously tv switch off, when i press signal button from from set up box, input dialog box open(tv, Av, hdmi, usb etc option.)
Can u tell me, what is wrong with my tv?
Hi, I am currently diagnosing the issue with my Samsung TV. The light will blink red, screen not turn on, and you heard a clicking sound, which I discovered was the power board once I took the back cover off the TV. I immediately saw a small burn (about 1/2 inch diameter) where two DSC 2.5D-15 Thermistors were. I assume this means I will have to replace the board, but I am just wondering, what could have caused this in the first place and will it happen again if I replace the unit? Thanks!
Sorry, but with dozens of different models on the market. I'm unable to make an educated guess as to what caused your thermistors to go bad.
I can't change any settings with remote but voice command all okay. What this problem is about. TV model UA43RU7470U
My Samsung Smart TV has audio and the backlight go on but there is no picture the menu doesn't pop up and the screen remains on but blank? What could the problem be?
My samsung tv has a white light that pulses on the upper part of the screen. Do you think its power supply board. The tv works just constant pulsing white light on the upper part of the screen. Picture is kind of dim even while in dynamic mode.
I had this issue. And get ready for a headache if i am right. Tvs purchased before 2009 were transitioning from ccfl (Cold cathode fluorescent lights) to LED (most tvs circa 2010).
Much like flourecent tubes in your basic office building these tubes dont last forever and when they go bad they flicker/short and blow out.
Now for 20 bucks you can fix the problem if you are handy and dont mind a headache. You will have to strip your tv down to the ccfl lighting. Remove the bulbs, preferably all of them.
Wire LED strips in parallel and run it to a 12 v supply off the power supply. Minor things to worry about, all your caps on the power supply are good (not bulging) and that the lights turn on with power button pressed.
You will be unable to dim your lighting but it will fix your issue.
There are lots of youtube vids showing installing led light strips in led tv
Hi, I’m hoping you can help me out. I have a 55 Samsung KU6290 that is having an issue. The picture and sound is great, so I don’t want to have to replace it unless I have too.
What is happening is that sometimes when I turn it on, it will turn on but then it immediately turns off and the indicator led will start flashing red. If I try to turn it back on, it will not. however, I am able to get it to turn back on if I unplug it from the wall outlet and leave it unplugged for like 2+ hours. After I plug it back in, it turns on and works like normal. I’m able to even power it off and back on like normal until it wants to mess up again and then I got to repeat the process.
Anyways, do you think This sounds like a power supply problem? Would replacing just that board (BN94-10712A) correct this issue?
Je veux savoir comment réparer l'image de mon TV Samsung LA32B450C4×8V
We have a Samsung UN55H6203AF version US01. The red light in front flashes and the TV won't turn on. We tested the fuse (it's fine), checked for anything "burnt" or "popped" as suggested in some other TH-cam videos . When the Power Supply board is plugged into the Main Board we have no backlights. When the plug is disconnected between these two boards the backlights come on! We bought a power supply board as recommended for this situation but it did not work. I also noticed we get flashing blue lights in the T-Con board. Any suggestions on what to try next or should I just purchase all three boards?
If your backlights come on after you disconnect the main board. I'd guess your main board is the problem.
@@GrantsPassTVRepair we purchased and installed a main board as you suggested. The TV works! Thank you so much!
Your welcome. :-) @@susandoll6990
Any idea where I can get the main board for my xvt3d554sv?
I would check with Shop Jimmy
Hi friend for my poor understanding of the English language I couldn't figure out how to enable the motherboard on / off .... could you kindly write it to me? Thanks! ?🙏
I have a Samsung tv. Un65j6200af and it had no lights so I replaced the LEDs. Now I get a very faint light I see the Samsung logo then 2 big vertical blue bars then back to black. I've also replaced the tcon board. Also when I unplug the cable from the main board to the power board and plug it in the wall nothing happens but when I unplug all the leds flash once. Could it be the main board or the power supply board?What do you think the problem could be? If you have time I would really appreciate it. Thank you!
Sounds like the display itself may have gone bad. Sorry to hear your throwing so much money at a TV which might be better spent towards buying a new one.
that is the issue we are having with out tv since its kinda old.. the hdmi port seem to have lost signal i guess from the main board overheating. i assume the only way to resolve that issue is top replace the main board for the tv?
th-cam.com/video/SGf8FEjGlVA/w-d-xo.html
What are the symptoms of a bad ribbon cable? I have a Samsung UN55NU8000 which is in an endless on/off loop (no image, just welcome sound and panel lights on/off) since plugged to power. Apparently main & power board are ok. Could be the ribbon? Or led panel went bad?
The symptoms would depend on where the ribbon cable is used.
@@GrantsPassTVRepair Two ribbon cables from motheboard to bottom center of the screen (like the T cable of the tv from your video) . Thanks for your help.
@@r.f.2366 A bad ribbon cable attached to the display can cause the picture to get thin vertical lines in it, but I'm guessing there are other symptoms I know nothing about.
@@GrantsPassTVRepair Just the ones i mentioned in my first comment. Could the ribbon cable cause the tv to restart over and over?
@@r.f.2366 I'm not sure.
Great video.....I have a Samsung 75" Q70R and it went black screen while watching a movie, it flashed blue every 20 seconds, I have some knowledge in electronics so I opened it to see if it had bad capacitors. With the TV energized, I disconnected the ribon cable that goes to the main board and the screen turned blue, so I assumed it was not the damaged screen, I have been looking on ebay and I have found the original power supply parts, do you think that replacing the board will solve the problem?...thanks
I don't like to guess on what will solve the problem, but it doesn't sound like a power supply issue. If I was to guess I'd say it's more likely to be a main board or t-con board issue, but that's just an educated guess.
@@GrantsPassTVRepair Thanks my friend
When I turn my toshiba TV on the backlight flashes and then turns back off. I can use a flashlight and see the TV is working just no backlight. I unplugged the power supply board plug at the power supply that connects to the mainboard and just kept messing with an eventually got it to work . Couple months later now I have the same problem but my trick isn't working anymore. Do you think this could be the main board or the power supply? And remember the TV is working as it should just no backlight
I don't want to guess and end up misleading you.
sir i have a problem in my samsung 32" led tv like it is showing red, green, blue, white screen on power or Burn mode and my power button does not work. How can i fix this on motherboard my TV model no. is UA32H4303AR, please make video on this issue
I have a Samsung UN32J5205AF. It turns on, but blinks pretty fast. Periodically, it will stop blinking for a few seconds. This may happen twice every hour or so. The tv has sound. Tv is in mint condition. Still has plastic on it, and of course the warranty has expired. Any easy fix? I miss Madden and my son misses Fortnite.
Hi,
I have a LG 55LF5700 LED tv
The standby light is on and I can see the picture with the flashlight test, so there is no back light but the tv is on. I test the standby power at the power board and there is no power. The 2 Led+ test points are only showing 30V. Is this a bad power board? Thanks!
I suspect you are taking voltage measurements form the wrong ground point. Even if the back light doesn't work, the fact that you can see the picture when you do the flashlight test tells me you most likely do have stand by power, or you would not see a picture when doing the flashlight test, Only measuring 30 volts going to your LED back lights also sounds suspicious. Here is a video that may help you. th-cam.com/video/M2v04tdp5B8/w-d-xo.html
@@GrantsPassTVRepair
Thanks for the quick reply,
I am testing on the cold side where the wires go from the power supply board to the main board, grounding to the chassis and everything reads the proper voltage but the standby voltage. Is it possible that just that standby wire has a separate ground? I have watched a ton of videos and I am testing it exactly how they did. Thanks again for your help. My father was going to throw out this 3-year-old 55-inch tv and said if I can fix it I can have it.
I don't know enough about your model to know if your stand by voltage has a ground of its own, but if pressing the power button makes the picture or sound come on, to me this suggests the stand by power should be there. @@jorendor
@@GrantsPassTVRepair Thanks, I'll do some more research.
Hi, very informative video. Question: when you explain about the logic board clue being at fault, and that a way to know this is bcuz it doesn't recognize you pressing the power off button,, can you say which button? The remote control button or the Tv's on/off button? Because on my Samsung UN55J620DAF, which just suffered some sort of melt down, turns on with remote or Tv button, but Only turns off with remote, not the Tv button. The red standby light flashes 4x and stops when I press to turn on. I am currently checking it bcuz a few days ago, as we watched Tv, we began to hear crackling at the rear of Tv and it went dim blue, then black. It turned off with remote, but I disconnected everything off the wall outlet as precaution, bcuz I also smelled burnt wire. Watching pertaining videos, I checked fuse, its good. I inspected all 3 boards and only at the power supply board did I see like melted wire plastic. I could not see anything unusual on the main green board, it has a red lit port. The T-con board seemed ok as well, it has blue lights when I power on. Odd thing is, she turns on with power button and remote, but will only turn off with remote, and the red standby light blinks 4 times and stops. I tested all LEDs thru the corresponding wire leads and many did not light. I tested the port pins from where the LED connector goes, and it had No current going out. I did unplugged cable connector from main or logic board and did get the four 12.65v results in those leads, plus the 4.50 power on voltage of other side. One thing is for certain, I am going to replace All the LED strips with new. And I am prepared to replace the power supply board as well. However, I am not sure about the green logic/main board. What say ye..? I'd appreciate any input. (incidentally, this Tv is 7yrs old, was working flawlessly)
I find your questions very difficult to understand, If your TV is able to turn on and off using your TVs remote control it does not sound like you have any problems wich need to be addressed except for the possibility that the power button on the TV itself is not responding. In that case I suspect the power button on the TV may be defective, but if your TV works good using the remote control then just use your remote control and the problem is solved right?
@@GrantsPassTVRepair Thank you for your reply. My apologies, I didn't mention there is No picture. When I explained "it turns on, I meant it acted as if. I thought, with what I wrote about the sudden crackling at the rear, screen went off, burnt wire smell, you'd understand what this thread is about. Thanks again.
@@GrantsPassTVRepair Any input..?
I have a Samsung 52" It works great, but on occasion when I turn it on, I don't hear the startup chime and I get a black screen and some moving color test gradients. Would that be the main board? I have no other issues when it is operating. If I cycle it on and off or let it warm up I'll hear the chimes and picture is perfect... Thanks Great Videos!!!
This is only a guess or course, but I would suspect it to be a main board issue because your chime doesn't come on when your picture comes on with distortions..
I because moving color gradient is a symptom of bad tcon board. I want to say I read that somewhere...
I have a problem with a Samsung, I suspect the main board...I can get a cheap 2nd hand part from the same model number TV....the board looks indentical in every way to mine but the part number is different.. would it be ok to use?
Sometimes the main board may look the same but might have a problem if you swap them, but it could possibly work.
Service manual states that after changing the main board you need to “set option bytes”. What is that, and how do you know what the setting should be?
It sounds like something you can only get into if you enter the TVs service mode to access this menu where you can then change the settings. Try to google Samsung TV service mode and see if you can find what this is for your particular model.
@@GrantsPassTVRepair You're correct about it being a setting in the service menu. I've since learnt that the specific settings are released by Samsung in Service Bulletins I don't have access to (and can't for the life of me find online).
I have a similar problem with my Samsung TV. The red light blinks. When I connect power board to the main board, light is seen but when I disconnect the power board to the main board lights are seen. What is the problem?
I had similar issues with mine , did you figure it out? What was the problem with yours?
hello, I hope you can help me ,I have a TV like this one and it went off after a storm, then I turned on aand it stays on for a couple of minutes and then goes u\out
I thougt it was the power supply., I OPENED and there is a chip on the main board and it feels very hot.,do you think it s the main, has a short?? thanks. where can I GET it ??
Check your capacitors are not blown up/short. On your power supply. Also your diodes should have huge resistance values in 1 direction. Any big resistors should also be checked for shorting.
Hi there, I have a Samsung UN55D8000. The screen is dim, but still view-able. However when I entered 3D Mode, the Screen works perfectly. But when going back to 2d the screen goes dim again, but still view-able. Based on the following research, I believe I have a bad main board. Also the cable connection is also bent and damaged on the main board.
1) T-CON Board - Is good if you can see the Menu when pressing the Settings Button
2) Backlight Test - Entering into 3D Mode the Backlight turns on and the dim appearence goes away completely. Which tells me the Backlight is fully fucntional.
This sounds like a Bad "Main Board"??? Please help. Thank you.
Main board is probably. Trace back to the power supply and confirm your getting proper voltages to the main board. You very well could have a short messing with the led driver when the demand is failing to activate the driver.
Also check your Drain and Source on all your MOSFETS and confirm no shorts.
Thank you sir
hey there, I have a similar issue where when you power it off, it doesn't go off and the remote also does not respond. the tv comes on, backlights light up but no picture. kindly assist. Thank you @grants
It could be a main board.
was the standby light on? My Samsung LED TV the standby light doesn't even light up
I don't remember on this one, but generally speaking if your stand by light doesn't come on, you have a power supply problem, or one of your other boards has a short which is dragging your stand by power down. I suggest you disconnect the other boards from the power supply, and then measure all the output voltages on the power supply to see if your stand by power has returned.
My vizio turns on fine, turns off fine but no picture, backlights or sound. Last thing I saw when turning on the television was what looked like a frozen picture of colored scan lines, sounds like the cpu froze up. Turned the tv off and when I went to turn it back on, nothing. Turned on and off but no picture, backlights or sound. The back of the main board looks like parts of the board are shining, like it's wet but it's not. Probably heat damage, sounds like the main board right?
I don't like to guess about television symptoms. If it were me I'd be testing voltages to look for better clues.
Grants Pass TV Repair How about symptoms happening over the years of using the tv? The first thing that stopped working was the I.R censor for the remote, that's hooked up to the main board. Then some hdmi ports stopped working, that's hooked up to the board. Lastly, audio coming through hdmi would be fine for an hour or so and then it would sound like a distorted echo, unplug the hdmi and plug it back in and it would work normally again. And the vizio symbol still lights up and shuts off when I turn the tv on and off. I don't have a voltage checker so I'm going with probability here. Too bad I can't find the cbpfrd1ka1 main board for sale anywhere on the internet.
Yes the main board does sound like a good suspect. Nevertheless I still like to take a few voltage measurements on it, as well as the other boards to look for additional clues. Due to the lower cost on new TVs often times they just aren't worth the effort.
Hello
I have a Samsung tv ue48h6400
I don't found any wifi network and wired don't connect any time some time I wait 1 hour to connect with wired cable
Sometimes reset the screen, sometimes take to long to open, sometime don't recognise the remote and sometimes don't work the back button
Can you tell me what you think is wrong
Mainboard or other board
Thanks
This is just a guess, but it sounds like a main board related issue.
HI, great video. Could you please advise, I have led light on but when
turning on, screen goes with `SMART TV` logo and then remains black, no
audio, nothing apart of black screen and all the led lights on - would
this be motherboard? Appreciate your reply )
It sounds like several possibilities. One of them being bad back lights causing the TV to go into shut down, or possibly a main board issue not allowing the TV to boot up. I have a whole series of videos you might find helpful at www.tvrepairinfo.com
@@GrantsPassTVRepair Thanks, very useful and it looks like a motherboard 👍👍