That fault was my very first electronic repair on my TV about 3 years ago. I had absolutely no idea about what I was doing ( I have little better understanding now thanks to Sorin) and I successfully replaced the diode after a few trials and errors and got an extra 2 years out of that TV. I let you imagine (or remember) how satisfied I was when I plugged the TV back and it worked. I was the king of the world! two years later the same fault occurred, replaced the diode and.....cracked the screen putting it back together. That TV is now my testing / practice / donor board. It has a special place in my heart...I mean experience.
I love watching this guy. He reminds me of my uncle who used to fix things with the strangest ideas. He even used to say the same timing. Get back in case it explodes. We called him uncle sketch. His repairs were sketch but they never failed! I wish I could repair like him.
i want to thank you for the advice about the samsung tv, i have just repaired a 40 inch Samsung smart tv version (ie : Model No : UE40F6670SB Model) and the P.S.U board has EXACTLY the same lay out, so when i put a "solder blob" on the SAME SPOT that you did...IT WORKED!! (proving ...like you said.....that the top LED strip that is behind the screen is slightly faulty), BUT...it's STILL a very good picture!! . . NICE ONE!! . . . Thanks again!!
So, at 26:50 you bridged the SMD transistor to what, a ground track? Also, I thought that it was an optocoupler’s job to monitor AND to shut down things when something goes weird, how is it, that in this case, it’s an SMD transistor that can shut down operations? Please explain. Thank you kindly
Sorin myr friend, thanks again for making us learn even more. Can you please detail your trace routing how you reached that small smd transistor and how you realized if you bridged the transistor the set will overpass the protection ?.
you can see there, one pin from relay goes to plus and the other goes to the smd transistor and also to a optocoupler. Thats mean if you short the relay only, will be not enough coz the smd transistor will shutdown the power supply anyway. So i bridged the transistor, in this way the relay is on all the time and optocoupler aswell
@@electronicsrepairschool Hi. I have a question about the Samsung ue55h6590 TV, I have changed background light byt I don't now in which Direktion goes silver folie, in Direktion to backgrounds light or in direction Monitor?
You should not just bridge out the faulty LED on the light bar like you suggested. Yes it will work for some time but If you bridge out the faulty LED you will put additional stress on the remaining LED's and they will blow also. I have fixed several LED strips and its easy to replace an individual LED once you take the screen apart. I use a small heat plate and heat the strip from beneath to remove and replace the faulty LED. Its a time consuming process but that's the correct way to fix the issue or replace the complete bar. The other thing to do is turn down the back light to about 50-70% as that will extend the life of those LED strips.The manufactures push the LED strips to their limits when the back light is cranked up to 100% and that will shorten the life of those strips. The LED strips are failing even on TV's that are within their warranty period due to the excessive stress on the back light LED's.
If the LEDs are in series and they are constant current driven, short one LED should not modify the others because the LED driver should try keep the same constant current, so theoretically it will lower the voltage.
@@neteinfo9111 I agree with your theory, however if that is the case why do I find strips with multiple leds that have failed. Some go short some go open. I believe the less stress you can put the led strips under the better. The other reason why not to short out a faulty led is you will end up with a dark patch on the screen. Don't bodge the repair, replace any faulty LEDs they cost pennies.
Great stuff friend. question. if led light is dying.. can you just remove the power going to the light ? or best way is to short it ? if short it wont the logic board see its not enough current at the LEDs and still kill power to TV to prevent start up ?
I made a lot of money taking in lots of samsungs with the click of death. There was a whole bunch of samsungs that had used 10v capacitors on a 12v rail and the caps had blown. Many just failed without actually popping. A quick replacement of a few 70 cent parts and they were better then new!
This guy is a genius. I had the exact same issue with my 65” Samsung LED. I spent ages trying to figure the problem out. Eventually I gave up and ordered a complete new power supply PCB. It resolved the issue for me. I did not have any LED line issues. I would still love to know what was wrong with the clicking power supply PCB.
I suspect the backlight issue wasn't the cause of the problem with this tv, or with yours either. The transistor that Sorin shorted is fed power from an auxiliary winding on the standby transformer, and enables the PFC circuit. Samsung have a known problem with a low value resistor downstream of that transistor failing, so the PFC circuit does not come on. The main board senses that, and cycles the power board to prevent the tv from working until the fault is rectified (or maybe they hope you'll purchase another tv from them)...
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
Hi mite. I got a question. Will be werry happy, if You can to answer. I got 49 inch LG 49LB5500 2years used, yesterday screen switching off for 1 sec and switching on it for one sec , and like this all the time. I dont know where can to be a problem. I would like to ask for Your advice. Thankyou
brother,i have same tv series,where the leds flickering and then tv restarting .can you help me to find the fault dead ics to replace?pls add me on fb : cetin su
Abderrazak Harakat, you see the dark part of the screen? And that Sorin said he fixed it by shorting the one dead LED? And customer is happy? It is not an IC fault.
@@davecc0000 in this case at this model of samsung its a power supply fault by a defective ic belive me.i have same issue and fixed it by changing power supply.it seems like a led defect,but its not!!the diffrence to defective leds its that the tv reestarts!!at defective led tv restarts not!
I have a frame 3.0 samsung, does the same thing, when i cool off the heat sink, the tv starts up and works fine for a few minutes, so the main cpu chip overheats and does the reboot.... in this video, is there a way to remove the heat sink? can the heat sink be reset, or is it stuck to the chip?? pls do a video, would be fun to see.
have you ever mistaken your liquid flux with your vaping liquid lol because they have the same bottle. i thaught you were using your vaping liquid there :) nice video you are the best.
How you came to the conclusion it was a graphic issue? The tv was half turning on and off and that could point to other problems. What was your troubleshooting steps? Which obviously it was not the graphic issue.
I have that model on F6400. It was the WiFi module which was dead! That's why it looped. If you disconnect it, the issue is solved. Simple as that. I'm still using the TV today after disconnecting some 4 years later!
How about a CAPACITOR HEATSINK FIN TUBE pressed over each capacitor. A repeatitive problem that needs technical addressing. Heating over 105 degrees C. will pop the capacitor some time in the future.
Great videos! Thank you for taking the time to make, share, and TEACH! So much knowledge and wisdom shared on your channel. (and on more than just electronics!) In my opinion one the best on YT!
I used to repair that kind of problem, I agree it's expensive if you do it the proper way, even without, because handling the LCD part of the TV is one of the most delicate things you do in electronics, even with all that, I used to charge around 500 pesos here in Mexico, that is 20 pounds, or 25 USD. If you are careful handling the display, the rest is easy, but is also time consuming, I think that's the main reason in this particular case it will be expensive to repair.
friend you have great knowledge :) to look at board and know what goes where and what. I am trying to understand how to troubleshoot TV board to find exactly what is short. can you send me some of your video that can help me troubleshoot ?
This is not the correct way to repair this issue. The LED should be replaced. They cost pennies. If you dont replace the LED, there will be a patch of darkness on the screen, and the remaining LEDs will fail quicker, too. Also, in electronics and TV repair since 1974. Remember to back the brightness off a few notches, too, after the fix. That's what blows them in the first place.
I have same problem after a lot of tracing and trying to be to technical actually forcing the backlight on i came to same solution and went a head replacing two banks(strips) of 6 leds in total. Yes once again new shortcut learned today.
Yes, you are correct about a dead led and it is similar to panasonic led tv where the backlight was turning on and off with nothing on the screen and standby led blinking like mad.
@@Kminn1, I have just watched your video, so I will try and replace the corresponding ICs tomorrow and will let you know if it works. sharp, jvc, sony, panasonic and hitachi boards etc are the same but the firmwares
@@Kminn1, i have 17mb130e for jvc lt-49c870(b), but I am having doubt of the chip( H5TQ4G63EFR). I don't think , it is the chip that needs programming. There is another IC and it looks like IC found in usb sticks and it is not 8 pins. Another thing, I don't know where to get the firmware for programming.
If you are right, you can bypass by adding jumper from any of working LED strip to not working, so the logic board will think that current is ok and you can remove applied jumper before to the transistor.
If the LED on that strip has failed open (and they usually do), then no a resistor wont help. LEDs on the strips are wired in series and the strips themselves are wired in parallel. You will see the good strips light up, but only for an instant before the feedback circuit shuts them off. You can bypass the feedback circuit like he did for troubleshooting, but not really a good idea long term. Best to either replace the LED, use a diode, or jump it out in my opinion If the LED has failed shorted, you could use a resistor but probably better of using a diode. It's hard to match replacement LEDs for color/brightness, so when they fail I just use a 1N4148 diode as a bypass.
Dacke good, so you just place an 1N4148 with polarity same as the original diode right? so voltage is going as if it were the original led? . Also I did as sorin how he came up to trace route the smd transistor and realized bridging it will overpass the backlight circuit can you explain to me ?
Thanks very much for such an educative video sir, it's one of the best repair video I have ever seen on youtube. I have a Samsung UN46D6400...TV with the same issue containing PRW/S BOARD model # BN44-00427B can you please help me with the trace and solder point to solve this issue? Thanks much.
can you guide me please mine is UE46C6710US Samsung smart tv coming on with stripes on the screen and Clicking off all the voltage are complete I’m a technician I’ve tried but couldn’t get success please help 🥰🥰🥰
NO LIGHT RAIL MAY BE GOOD I SWITCHED THE PINS FOR LED RAIL 1+/1_ AND LED RAIL 5+/5_ AND THE TV NOW HAS DIMNESS IN IN DIFFERENT PLACE ON THE SCREEN.I HAVE NOTICED DIFFERENT VOLTAGES FROM THE CAPS ON THE LED DRIVERS.
PS: 93% of the flats made, have the LED backlight voltages purposely over driven (too much voltage)....WHY??? Because LED's practically last forever compared to incandescent lighting, Hence, that new Vizio 65" 4k might last you 12-17 years if we keep the LED voltages to spec (3.4vdc or sometimes 6vdc per LED), and OH Hellz to the NO, We'll make sure your buying another TV in 2 to 3 years after warranty expires. _" So overdrive the LED warp engines Mr Scott..Warp Factor 6"_ Want a quick, no cost, done by remote way to add 5-7 years more to that 4K 70" behemoth?? Simply go into your TV's menu via remote, and go to your picture settings and turn down the backlight from "100" (Factory default) to about 50-60, You'll probably won't even see the difference, but all those little light emitting diodes will, by about 1.8 - 2.1 vdc...and they will thank you for it by shining on for another dozen seasons of _"Game of Walking Dead Thrones Breaking Bad on 911"_ ...or whatever your fav shlok slop tv idiot-box show of choice currently is....
First of all thanks for answering, I've already seen that video (I don't miss any of your videos ;) ) but i don't know the proportions between alcohol and rosin.and general the procedure.for example you use it just after you make it or it has to stays
I find many big brand new samsung tv with minor problens. like a broken plastic part for the power button ... tv put to trash (those tv are brand new xD) now i have to many working tvs xD $$$$$
Are you going to post any video on desktop components? You cover laptops, smartphones, TVs, tablets, but no desktop and I think that a lot of people are interested in that. Dead desktop motherboards,graphics cards are a problem for a lot of people...
Hello master, first I want to say a big thank you for all your videos on TH-cam, I really really like them and you're the best, God bless you!!! But I'm actually new to your channel and I have a problem here that you have not made videos about since I subscribed to your channel. I really need urgent attention thanks... I have a HP compact pro 4300 desktop CPU, the problem is that when the power cable is plugged in, it flashes the green power light and the DVD rom light at the same time and goes off, this happens many times as long as I keep the power plugged into the CPU, and when I unplug the power cable, it beeps red light three times before going off. Please master, what is the problem and solution? Please help, it's really urgent. Thanks a lot!
hi . i have a question. i have a hp probook .it is charging but no power on. There is 3.3 and 5 volt. Bios and kbc get power. also voltage on on/off button. I can`t find the problem . is kbc chip bad?
i swapped the same smsc chip from another mainboard, but still no startup of the laptop. hmm..maybe that smsc was dead too :) ...can it be something else like corrupt bios. I tried to view data on SO pin of bios chip, but i see nothing on oscilloscope
S.a.j. Uffen you cannot just replace kbc chip from any board the kbc chip has its own programming data inside it for a particular motherboard. If you want to replace the kbc with similar chip then after replacing it you need to re-programme it with old kbc dump or a new working dump for same motherboard. And about your problem check if your bios firmware is not corrupted or your EC. Check which state is your motherboard in and check all alwats present rails im sure there is one missing. Well probook have commonly bios issues try re flashing bios chip.
My TV having the same problem I open the back clean it out everything turn the power on still doing the same after power off left side board remove the wire connecting right turn it power on turn it off again and connect the wire and restart the TV now tv working perfectly good
This pleasure bypass only relay "connected to current sense" if have all backlight ok work fine💪. But If have one STRIPLED with one led damaged the corrispective backlight not work or work with diffent lux! 😜💪Right?
Well they are the best so far. Also they don't last because people always put them on 100% brightness. It's like having a car that goes up to 300Km\h, if you are always at this maximum speed, the car will not last longer.
I haven't had any problems with good quality LED lighting. It's always the cheap stuff that runs LEDs at too high a temperature, or has poor current matching, or even poor connections on the LED die.
Replacing backlights in a TV is also too much work for me. I charge $400 for the job and tell my clients that they are better off buying a new TV. Frank Frank Reiser Video/Audio Service
My Samsung has been turning off and on for years I got it serviced 65 years ago. Last night it went out again but I got lucky and half way though taking off back to check board and capacitors then it just turned on! I probably jinxed it....damn lol
you know my father exactly looks like you and you and him both have same profession.i'm from Pakistan but i don't know how it is possible i think forefathers were cousins
That fault was my very first electronic repair on my TV about 3 years ago. I had absolutely no idea about what I was doing ( I have little better understanding now thanks to Sorin) and I successfully replaced the diode after a few trials and errors and got an extra 2 years out of that TV. I let you imagine (or remember) how satisfied I was when I plugged the TV back and it worked. I was the king of the world! two years later the same fault occurred, replaced the diode and.....cracked the screen putting it back together. That TV is now my testing / practice / donor board. It has a special place in my heart...I mean experience.
I love watching this guy. He reminds me of my uncle who used to fix things with the strangest ideas. He even used to say the same timing. Get back in case it explodes. We called him uncle sketch. His repairs were sketch but they never failed! I wish I could repair like him.
Tarjam
Are you vapping ? It's very bad for health . Please stay healthy we need people like you ! You, Sir, are a teacher .
Every-night after talking to my girlfriend i see your videos until late, because they have a lot to learn. Thank you sir.
just talking Pedro?? You do have alot to learn! And i dont mean good grammar
i want to thank you for the advice about the samsung tv, i have just repaired a 40 inch Samsung smart tv version (ie : Model No : UE40F6670SB Model) and the P.S.U board has EXACTLY the same lay out, so when i put a "solder blob" on the SAME SPOT that you did...IT WORKED!! (proving ...like you said.....that the top LED strip that is behind the screen is slightly faulty), BUT...it's STILL a very good picture!! . . NICE ONE!! . . . Thanks again!!
So, at 26:50 you bridged the SMD transistor to what, a ground track? Also, I thought that it was an optocoupler’s job to monitor AND to shut down things when something goes weird, how is it, that in this case, it’s an SMD transistor that can shut down operations? Please explain. Thank you kindly
Sorin myr friend, thanks again for making us learn even more. Can you please detail your trace routing how you reached that small smd transistor and how you realized if you bridged the transistor the set will overpass the protection ?.
you can see there, one pin from relay goes to plus and the other goes to the smd transistor and also to a optocoupler. Thats mean if you short the relay only, will be not enough coz the smd transistor will shutdown the power supply anyway. So i bridged the transistor, in this way the relay is on all the time and optocoupler aswell
@@electronicsrepairschool Hi. I have a question about the Samsung ue55h6590 TV, I have changed background light byt I don't now in which Direktion goes silver folie, in Direktion to backgrounds light or in direction Monitor?
You should not just bridge out the faulty LED on the light bar like you suggested. Yes it will work for some time but If you bridge out the faulty LED you will put additional stress on the remaining LED's and they will blow also. I have fixed several LED strips and its easy to replace an individual LED once you take the screen apart. I use a small heat plate and heat the strip from beneath to remove and replace the faulty LED. Its a time consuming process but that's the correct way to fix the issue or replace the complete bar. The other thing to do is turn down the back light to about 50-70% as that will extend the life of those LED strips.The manufactures push the LED strips to their limits when the back light is cranked up to 100% and that will shorten the life of those strips. The LED strips are failing even on TV's that are within their warranty period due to the excessive stress on the back light LED's.
YOU ARE RIGHT >
If the LEDs are in series and they are constant current driven, short one LED should not modify the others because the LED driver should try keep the same constant current, so theoretically it will lower the voltage.
Should test if are constant current.. some TV have constant voltage
@@neteinfo9111 I agree with your theory, however if that is the case why do I find strips with multiple leds that have failed. Some go short some go open. I believe the less stress you can put the led strips under the better.
The other reason why not to short out a faulty led is you will end up with a dark patch on the screen. Don't bodge the repair, replace any faulty LEDs they cost pennies.
thanks for your input. what can i do.. please help me
What if I short circuit the relays, instead of tracking the transistor? Wouldn't produce the same results or it would damage something else?
From now on, you're my teacher, MASTER. Thank's.
we need more tv repair videos :) you are great.only the gopro you should place more to you,that we can see like nearly how you see.
Great stuff friend. question. if led light is dying.. can you just remove the power going to the light ? or best way is to short it ? if short it wont the logic board see its not enough current at the LEDs and still kill power to TV to prevent start up ?
My friend! You are genius but this issue is psu problem. One of two led drive (slc5012) is dead.
I made a lot of money taking in lots of samsungs with the click of death. There was a whole bunch of samsungs that had used 10v capacitors on a 12v rail and the caps had blown. Many just failed without actually popping. A quick replacement of a few 70 cent parts and they were better then new!
Have same board did u ever fix ?
0:30 it's a samsoooong :D
i love ur vids man
please show us what you further did to fix the tv, did the customer agree to fix the led ?
This guy is a genius. I had the exact same issue with my 65” Samsung LED. I spent ages trying to figure the problem out. Eventually I gave up and ordered a complete new power supply PCB. It resolved the issue for me. I did not have any LED line issues. I would still love to know what was wrong with the clicking power supply PCB.
I suspect the backlight issue wasn't the cause of the problem with this tv, or with yours either. The transistor that Sorin shorted is fed power from an auxiliary winding on the standby transformer, and enables the PFC circuit. Samsung have a known problem with a low value resistor downstream of that transistor failing, so the PFC circuit does not come on. The main board senses that, and cycles the power board to prevent the tv from working until the fault is rectified (or maybe they hope you'll purchase another tv from them)...
You can fix everything (electronics). I am curious, what did you study, are you electronic engineer?
not everything -go pro camera he doesn't know haaaaaaaaaaaaaaaa
Why dina do you know how to rapair go pro camera?
Thanks a lot Master for sharing this pleaseful moment!
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
Hi mite. I got a question. Will be werry happy, if You can to answer. I got 49 inch LG 49LB5500 2years used, yesterday screen switching off for 1 sec and switching on it for one sec , and like this all the time. I dont know where can to be a problem. I would like to ask for Your advice. Thankyou
Dear it's only the power supply issue...
I repaired this fault many times in F models. One of the two LED control IC is dead.
brother,i have same tv series,where the leds flickering and then tv restarting .can you help me to find the fault dead ics to replace?pls add me on fb : cetin su
I have the same issue with my Samsung UN46D6400..tv and is seeking help to identify where to do the bridging or the dead ics as well.
Abderrazak Harakat, you see the dark part of the screen? And that Sorin said he fixed it by shorting the one dead LED? And customer is happy?
It is not an IC fault.
@@davecc0000 in this case at this model of samsung its a power supply fault by a defective ic belive me.i have same issue and fixed it by changing power supply.it seems like a led defect,but its not!!the diffrence to defective leds its that the tv reestarts!!at defective led tv restarts not!
sir i havesome question u help me
I have a frame 3.0 samsung, does the same thing, when i cool off the heat sink, the tv starts up and works fine for a few minutes, so the main cpu chip overheats and does the reboot.... in this video, is there a way to remove the heat sink? can the heat sink be reset, or is it stuck to the chip?? pls do a video, would be fun to see.
Ce faci cu Mac-ul ala din spate, este cumva PowerPC? Sau altfel zis, stii daca este PowerPC, sau este doar carcasa dar nu si componentele?
have you ever mistaken your liquid flux with your vaping liquid lol because they have the same bottle. i thaught you were using your vaping liquid there :) nice video you are the best.
I said that on another video hahahahahaha
How you came to the conclusion it was a graphic issue? The tv was half turning on and off and that could point to other problems. What was your troubleshooting steps? Which obviously it was not the graphic issue.
Buna Domnu Sorin, de ce nu ati alimentat placa sursa separat , adica fara main fara LED-uri.? poate face la fel si el este de vina ?
Power Mac G5 or Mac Pro in background? I would like to see the repair of that beauty... :)
New to the channel to understand more on repairing PCB boards for washer and dryers. This is Great Information you are providing. Thank You
Thank you from 🇮🇳 INDIA
I have that model on F6400. It was the WiFi module which was dead! That's why it looped. If you disconnect it, the issue is solved. Simple as that. I'm still using the TV today after disconnecting some 4 years later!
How about a CAPACITOR HEATSINK FIN TUBE pressed over each capacitor. A repeatitive problem that needs technical addressing. Heating over 105 degrees C. will pop the capacitor some time in the future.
Thank you for all your videos you've helped me out a few times
Which board did u work on? Power supply? I know a guy who scraps tvs. So I can swap boards with him. Thanks.
Great videos! Thank you for taking the time to make, share, and TEACH! So much knowledge and wisdom shared on your channel. (and on more than just electronics!) In my opinion one the best on YT!
I agree
I used to repair that kind of problem, I agree it's expensive if you do it the proper way, even without, because handling the LCD part of the TV is one of the most delicate things you do in electronics, even with all that, I used to charge around 500 pesos here in Mexico, that is 20 pounds, or 25 USD. If you are careful handling the display, the rest is easy, but is also time consuming, I think that's the main reason in this particular case it will be expensive to repair.
friend you have great knowledge :) to look at board and know what goes where and what. I am trying to understand how to troubleshoot TV board to find exactly what is short. can you send me some of your video that can help me troubleshoot ?
where is the fulte? what parts shoud change
thanks for the tip..it's much appreciated (and i've been in the electronics tv repair trade since 1974)
This is not the correct way to repair this issue. The LED should be replaced. They cost pennies. If you dont replace the LED, there will be a patch of darkness on the screen, and the remaining LEDs will fail quicker, too. Also, in electronics and TV repair since 1974. Remember to back the brightness off a few notches, too, after the fix. That's what blows them in the first place.
I have same problem after a lot of tracing and trying to be to technical actually forcing the backlight on i came to same solution and went a head replacing two banks(strips) of 6 leds in total. Yes once again new shortcut learned today.
th-cam.com/video/VUqslWr9f4w/w-d-xo.html
Good luck sir 🎉
U made my day sir.... thank you !!!!
Yes, you are correct about a dead led and it is similar to panasonic led tv where the backlight was turning on and off with nothing on the screen and standby led blinking like mad.
Do you know which part needs to be replaced? I don't know much about electronics
@@Kminn1, I have just watched your video, so I will try and replace the corresponding ICs tomorrow and will let you know if it works. sharp, jvc, sony, panasonic and hitachi boards etc are the same but the firmwares
@@petejackson7976 Ok, i would appreciate it
@@Kminn1, i have 17mb130e for jvc lt-49c870(b), but I am having doubt of the chip( H5TQ4G63EFR). I don't think , it is the chip that needs programming. There is another IC and it looks like IC found in usb sticks and it is not 8 pins. Another thing, I don't know where to get the firmware for programming.
@@petejackson7976 Sounds complicated
👍👍👍👍 Sorin, you are a mad scientist.
thank you for teaching electronics and i even dont know anything about electronics
An excellent teacher, an invaluable experience :o))
If you are right, you can bypass by adding jumper from any of working LED strip to not working, so the logic board will think that current is ok and you can remove applied jumper before to the transistor.
If you bypass the led, you will get a dark area on the screen.
Diana's always somewhere in the background. When will she do a video?
She did a top shelf one years ago...all i will say is phoarrrrr
can you put a resistor in series with the defective led rail so that the system sees it as a load and would not shut down?
If the LED on that strip has failed open (and they usually do), then no a resistor wont help. LEDs on the strips are wired in series and the strips themselves are wired in parallel. You will see the good strips light up, but only for an instant before the feedback circuit shuts them off. You can bypass the feedback circuit like he did for troubleshooting, but not really a good idea long term. Best to either replace the LED, use a diode, or jump it out in my opinion
If the LED has failed shorted, you could use a resistor but probably better of using a diode. It's hard to match replacement LEDs for color/brightness, so when they fail I just use a 1N4148 diode as a bypass.
thank you for enlightening me.....
Dacke good, so you just place an 1N4148 with polarity same as the original diode right? so voltage is going as if it were the original led? . Also I did as sorin how he came up to trace route the smd transistor and realized bridging it will overpass the backlight circuit can you explain to me ?
th-cam.com/video/VUqslWr9f4w/w-d-xo.html
th-cam.com/video/VUqslWr9f4w/w-d-xo.html
Thanks very much for such an educative video sir, it's one of the best repair video I have ever seen on youtube.
I have a Samsung UN46D6400...TV with the same issue containing PRW/S BOARD model # BN44-00427B can you please help me with the trace and solder point to solve this issue?
Thanks much.
can you guide me please mine is UE46C6710US Samsung smart tv coming on with stripes on the screen and Clicking off all the voltage are complete I’m a technician I’ve tried but couldn’t get success please help 🥰🥰🥰
YES, finally Friday ;)
u r great sir we are learning a lot
Backlight issue. Thanks a lot 👍🙏🏻
NO LIGHT RAIL MAY BE GOOD I SWITCHED THE PINS FOR LED RAIL 1+/1_ AND LED RAIL 5+/5_ AND THE TV NOW HAS DIMNESS IN IN DIFFERENT PLACE ON THE SCREEN.I HAVE NOTICED DIFFERENT VOLTAGES FROM THE CAPS ON THE LED DRIVERS.
Thank you for sharing!!!
Cheers
Xcellent Xcrements,Luv the vids so much, finally broke down and subbed.... Thanks
...and remember kiddies.... *"E" will ALWAYS equal "I" times "R"*
PS: 93% of the flats made, have the LED backlight voltages purposely over driven (too much voltage)....WHY??? Because LED's practically last forever compared to incandescent lighting, Hence, that new Vizio 65" 4k might last you 12-17 years if we keep the LED voltages to spec (3.4vdc or sometimes 6vdc per LED), and OH Hellz to the NO, We'll make sure your buying another TV in 2 to 3 years after warranty expires. _" So overdrive the LED warp engines Mr Scott..Warp Factor 6"_
Want a quick, no cost, done by remote way to add 5-7 years more to that 4K 70" behemoth??
Simply go into your TV's menu via remote, and go to your picture settings and turn down the backlight from "100" (Factory default) to about 50-60, You'll probably won't even see the difference, but all those little light emitting diodes will, by about 1.8 - 2.1 vdc...and they will thank you for it by shining on for another dozen seasons of _"Game of Walking Dead Thrones Breaking Bad on 911"_ ...or whatever your fav shlok slop tv idiot-box show of choice currently is....
Hey sir today i have lenovo ideapad 100 same way that doing loop restart after logo what i do to repair that?
it's the flash ic's you hve to replace it it's always the flash ic's or ram in all phones and tablets
Maybe you could try using a painting easel to support the television rather than having to balance it on your lap or having to lay it on a counter.
Buna Sorin merci mori prof 7/7
They sell these backlight testers, with these you can diagnose a backlight in seconds. Nice fix anyway.
So back light issue it was good thankyou for video
How do you make your liquid flux? Make a short video plz
i did, check 'About my flux'
First of all thanks for answering, I've already seen that video (I don't miss any of your videos ;) ) but i don't know the proportions between alcohol and rosin.and general the procedure.for example you use it just after you make it or it has to stays
About my flux
So what the solution? Optocoupler?
you have to make a video about that GoPro of yours, why it is always freezing lol .
A true MASTER.
It’s sad to imagine how many appliances hit the tip due to small parts breaking..
I find many big brand new samsung tv with minor problens.
like a broken plastic part for the power button ... tv put to trash (those tv are brand new xD)
now i have to many working tvs xD
$$$$$
Are you going to post any video on desktop components? You cover laptops, smartphones, TVs, tablets, but no desktop and I think that a lot of people are interested in that. Dead desktop motherboards,graphics cards are a problem for a lot of people...
I have same problem but all back lights are ok. This is power supply fault
Hello master, first I want to say a big thank you for all your videos on TH-cam, I really really like them and you're the best, God bless you!!! But I'm actually new to your channel and I have a problem here that you have not made videos about since I subscribed to your channel.
I really need urgent attention thanks...
I have a HP compact pro 4300 desktop CPU, the problem is that when the power cable is plugged in, it flashes the green power light and the DVD rom light at the same time and goes off, this happens many times as long as I keep the power plugged into the CPU, and when I unplug the power cable, it beeps red light three times before going off. Please master, what is the problem and solution? Please help, it's really urgent. Thanks a lot!
hi, i'm not very good on fixing desktops, maybe its cheap to replace motherboard
Thanks for your response sir, I'll bring up a laptop issue soon, I'm sure you will be able to handle that
i'm not able to handle anything :) Even if you your laptop will be beeping again, you have to try and resolder the processor on the graphic side
I think your processor in not seated probably in slot..
Or may b you have changed processor..
I think your processor in not seated probably in slot..
Or may b you have changed processor..
Thanks and your work really nice ... : )
well one more time i will say you fix Great info.
Thank You. Best Regards from Germany. Like and Abo have You.
Very nice video! :-)
hi . i have a question. i have a hp probook .it is charging but no power on. There is 3.3 and 5 volt. Bios and kbc get power. also voltage on on/off button. I can`t find the problem . is kbc chip bad?
most likely
i swapped the same smsc chip from another mainboard, but still no startup of the laptop. hmm..maybe that smsc was dead too :) ...can it be something else like corrupt bios. I tried to view data on SO pin of bios chip, but i see nothing on oscilloscope
S.a.j. Uffen you cannot just replace kbc chip from any board the kbc chip has its own programming data inside it for a particular motherboard. If you want to replace the kbc with similar chip then after replacing it you need to re-programme it with old kbc dump or a new working dump for same motherboard. And about your problem check if your bios firmware is not corrupted or your EC. Check which state is your motherboard in and check all alwats present rails im sure there is one missing. Well probook have commonly bios issues try re flashing bios chip.
You are brilliant
Backlight issue like some jvc tv(lt-50c550)
Hello sir my tv same problem how i fix
Plzz help me with my learning ...I would appreciate if I can Skype u for some advice with this work...thanks
My TV having the same problem I open the back clean it out everything turn the power on still doing the same after power off left side board remove the wire connecting right turn it power on turn it off again and connect the wire and restart the TV now tv working perfectly good
This pleasure bypass only relay "connected to current sense" if have all backlight ok work fine💪.
But If have one STRIPLED with one led damaged the corrispective backlight not work or work with diffent lux! 😜💪Right?
Hard to find somebody who knows what the fuck they’re talking about. Good lookin out. ✊🏻
for the jump solder at 26.48 min mark was a bad move.
i have never trusted leds for lighting, they just dont seem to last :-(
Well they are the best so far.
Also they don't last because people always put them on 100% brightness.
It's like having a car that goes up to 300Km\h, if you are always at this maximum speed, the car will not last longer.
I haven't had any problems with good quality LED lighting. It's always the cheap stuff that runs LEDs at too high a temperature, or has poor current matching, or even poor connections on the LED die.
The top row of LEDs being dead = vignetting, an artistic effect. Call it a free feature upgrade! ☺
Thankyou for video mines doing that too thankyou
whats the cause of this ?
Replacing backlights in a TV is also too much work for me. I charge $400 for the job and tell my clients that they are better off buying a new TV.
Frank
Frank Reiser Video/Audio Service
Subscribed
Hallo master.samsung 46f8080?
BN44-00635B.
Thx
Solved thx 36 minutes in
all valuable information ...
Sir let me tell you something you are brilliant
Did i hear mckintosh plus in the background?
I have TV Samsung model code: UA46F7500 with problems pictures working normal but light flashing
I found three big brand new samsung tv in one week with this problem (put to trash) ...
now i have to many working tvs xD
My Samsung has been turning off and on for years I got it serviced 65 years ago. Last night it went out again but I got lucky and half way though taking off back to check board and capacitors then it just turned on! I probably jinxed it....damn lol
Wooop Wooop nice job :)
you know my father exactly looks like you and you and him both have same profession.i'm from Pakistan but i don't know how it is possible i think forefathers were cousins
I love you man