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Author Topic: LG LCD tv warm up issues  (Read 1000 times)

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Offline QuantumplateTopic starter

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LG LCD tv warm up issues
« on: January 28, 2022, 03:56:42 pm »
It's an LG26LC55 that's been on the blink for some time ie years! Used to get the screen pic attached for about ten minutes, then slowly the working picture would arrive via three horizontal bands that would each start working in turn. After some months though the pic would never arrive. Had some luck replacing a few out of spec caps in the power supply section - there was still a long wait, but the picture would eventually work fine. Now, no pic, just the screen with frozen vertical lines. I've replaced all the caps now bar the two 450v ones on the board. I've also tried two different AV boards - used from ebay, so heaven knows if they were ok to start with, and no change.
If anyone can diagnose from this brief description then I'm all ears and very grateful. Should I replace the final two caps on the power board (the 450v ones)? New to this game.
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Online inse

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Re: LG LCD tv warm up issues
« Reply #1 on: January 28, 2022, 05:22:57 pm »
If it is obviously a thermal behaviour, get a hairdryer and cooling spray and start searching for the culprit.
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Offline BrokenYugo

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Re: LG LCD tv warm up issues
« Reply #2 on: January 28, 2022, 06:00:51 pm »
I would assume trouble on the TCON board or in the panel itself. You've more or less eliminated everything upstream.
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Offline QuantumplateTopic starter

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Re: LG LCD tv warm up issues
« Reply #3 on: January 29, 2022, 07:50:01 pm »
Yes, you're probably right about the tcon. I'm trying to remove it but it's got me stumped at the moment. Can't find anything online, do you know the procedure?
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Offline BrokenYugo

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Re: LG LCD tv warm up issues
« Reply #4 on: January 29, 2022, 09:34:58 pm »
I've never personally seen this model, it isn't in plain view after removing the back?
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Offline QuantumplateTopic starter

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Re: LG LCD tv warm up issues
« Reply #5 on: January 29, 2022, 10:26:15 pm »
That's it under a steel cage. Four screws go thru that holding the pcb down, but if I then angle the cage up and try and pull the board out there 's a ribbon cable holding it back, and doubtful if I have room to pull it out anyway.
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Offline sean0118

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Re: LG LCD tv warm up issues
« Reply #6 on: January 30, 2022, 10:28:23 am »
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Offline QuantumplateTopic starter

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Re: LG LCD tv warm up issues
« Reply #7 on: January 30, 2022, 11:25:57 am »
Thanks for the link, interesting.
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Offline abdulbadii

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Re: LG LCD tv warm up issues
« Reply #8 on: January 30, 2022, 11:53:38 am »
Honestly I'm not knowledgeable on this but read

https://electronicshelponline.blogspot.com/2013/06/how-to-diagnose-failed-tcon-board-how.html

if know what it means by video process circuit is than it'd be very helpfful
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