LG TV Random LED Backlight Failure, Power Supply or Faulty LED?
Hi all,
I am currently at a stand still with an issue. My LG TV (70LB656V) will work power on and function fine, however, as soon as a movie, video or TV starts to play, the LED backlights will power off after a random amount of time.
Troubleshooting:
I have managed to extend the time by turning power saving onto maximum and turning the brightness down to 50%.
Power supply board (EAY63072301) has a red LED light on, which appears to flash a fault code of 4.
Voltages to LEDs seem normal until failure occurs.
There is 120v from the heatsinks on the MOSFETs to ground (Is this normal?).
Question:
I would like a second opinion before i go ahead and purchase one, but does the issue occuring sound like Power fault, or LED fault? And does anyone happen to know the meaning of the fault code on the power supply board?
Thanks.
Update (09/18/2019)
@oldturkey03 The LCD still worked fine. I believe I located the issue. A bit more prodding around and I found that there is a LED that is not working, which if I understand correctly, it actually causes the entire array to slowly malfunction over time.
Will replace the LED and respond with the outcome.
Update (09/28/2019)
Turned out there was a blown LED, I have replaced the LED that had blown and it is working 100% again.
Es esta una buena pregunta?
4 comentarios
@kiwitronics that is correct. that is where i was going with those tests. LG has had issues with their backlight arrays. Those are a bit of a PITA to replace since you have to pull the panel apart. The larger the panel the bigger the chance of failure :-)
- de oldturkey03
@oldturkey03 yeah mate, I had it apart a couple days ago to mount all the defuses back into place, just purchased it faulty (all the defuses had failed out of place) put it back togeather, worked mint for half a movie and backlights went off. I was trying to avoid having to pull it back apart again but glad I did.
- de Michael
@kiwitronics should have told us that you have had it apart already :-) that way we could have gone straight for the LED's :-)) Best of luck to you.
- de oldturkey03
Am having same issue, am in Sharjah , any hope to fix it?
LG told to replace it which I cost to buy a new TV
prasanth6410@gmail.com
- de Prasanth Viswanath