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My TV has a slow start of one or two minutes and then it only stays on for 20 or 30 minutes and give me a black screen. What's the problem?
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@faceoffback sounds like bad capacitors probably on the power board or the T-con board. you did not say that you continue to have sound when this happens. Verify that it is only your screen that goes blank. Let us know the exact model of your TV and post some pictures of all of your boards with your question. That way we can see what you see. Use this guide Adding images to an existing question for that.
Start off with these relatively simple checks
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When the TV goes black the sound goes out as well
@faceoffback okay skip the t-con board and focus on the power board. Your TV a LG 37LF65?
Yes it is thanks
Yes my TV is the LG model that you posted
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