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Have a TCL 65' TV. 65S425 model number.
I've done a factory reset (which was incredibly difficult with no picture).
I've replaced the power board
I've replaced the video board
I'm not sure what i can replace next. Since I see the splash screen briefly i'm guessing the picture can project fine, i don't know. Up for any ideas on what i can fix/replace next.
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@Jeff Young What I've seen is that the power supply brings up the backlight strips but if it detects a fault in the voltage and/or current, it shuts them back down again. So yeah, it's entirely possible for bad backlight strips to light up for just a few seconds like you're seeing.
I had a similar issue with a TV a friend had that turned out to be the backlight strips. I splurged $20 on a backlight tester on eBay and found that the tester could light up the strips, but there were obvious spots where LEDs were out. I got something like this.
TV Backlight Tester LCD LED Lamp Strips Beads Test Tool Measurement Instruments
Once I took it apart, I could see that there were several individual LEDs that weren't lighting up. I found replacement chips, but ultimately decided that with the number of them that were out the problem was only going to continue with more of them dying so I elected to just replace all of the LED strips and that fixed the problem.
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Thanks Jerry. I'm gonna order the test tool and follow up next week if it's the LED strips. Gonna live the question open until I test it.
Took longer than expected but I ordered an LED voltage testing tool. Tested the strips and one of the six were out. So i ordered a new set of 6 strips, replaced just the one, and the tv works. Wish i would've started with the LED strips and worked my way back but the LED strips were the hardest to replace. Thanks Jerry
@Jeff Young Yeah, I fully understand; mine were a PITA to replace too. Kind of nerve-wracking worrying about damaging the bloody LCD screen, but managed it without any major issues.
Anyway, congratulations on a successful repair! Thanks for letting us know how it turned out.
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Hi Jeff,
Does it have sound? Can you make out any image when you hold a flashlight up to the screen in a darkened room? I'm thinking backlight failure here...
- de Jerry Wheeler
What's up Jerry -
Sound works fine. I was able to do a factory reset when it died using accessibility mode so it could narrate all the menu choices.
The backlight is next on the list, but if i see the TCL splash screen (that initial screen when the TV turns on) is the lighting (led strips) the problem? I've tried the whole flashlight thing to look for a dim picture but couldn't see anything....though I don't have the best eyes.
But also, I don't think these TVs have just one LED strip....so do they all go out together or is it like christmas lights where if one is broke they're all broke?
- de Jeff Young