Help diagnosing faulty 55PUS6704.
Hi. I'm looking for some help from the community to diagnose the fault on my Philips TV please.
It started off with a darkish hazy horizontal band about 1/3 from the bottom of the screen. About a week later the screen went black (screen off, no backlight) after changing inputs. Input signal was working briefly before going off. Sound still worked, but eventually the sound also stopped working. Ambilight still works and changes colour in response to pressing menu buttons, etc. When powering on, the backlight briefly flashes for a split second then goes off.
I was suspecting TCON board but I'm not sure since there are issues with backlight and sound also. Tested voltage and it appears to be getting 12v, although I'm not entire sure where the board fuse is, so not sure if that is at fault.
Before I go and buy a replacement TCON board, I would greatly appreciate advice on additional things to check to diagnose the fault.
Thanks in advance!
UPDATE 1: Adding images of boards
Update 2 - 03/09/2023
@oldturkey03 - here's some better pictures of the TCON board (hopefully)
Update 3 - 03/09/2023
@oldturkey03 Right, good news (I think). Turns out the screen and sound are in fact working. Not quite sure how I missed it in my earlier tests (must have been on a bad input), but I managed to load up the YouTube app and with flashlight could confirm picture and sound.
So now I've further dismantled in an attempt to access the backlight LEDs. It was proving a bit tricky/noisy for tonight so have stopped and will continue again tomorrow. I did notice an odd smell when accessing the panels so I'm thinking perhaps one of the LED strips has burned out which would correlate with the dark shadow we saw on the screen before it failed completely. Challenge now is to figure out if it's the strips themselves or the driver / power supply. The backlight flashes on briefly when the TV powers up but I haven't yet confirmed if all of the strips light up, or just some of them.
UPDATE 4 - 04/09/2023
Backlight strips accessed and confirmed 2x LEDs not working across 2 separate strips when testing with multimeter diode tester. So now to decide whether to replace both strips, or just the 2 LEDs.
@oldturkey03 - Any thoughts on how easy it is to replace individual LEDs and where to source replacement LEDs or strips? Anything else to check before replacing?