Question LG 60PH6700 Sound with No Picture

Sep 27, 2020
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TV initially turns on and operates fine for about five minutes. Then for the next 10-20 minutes, picture goes black randomly, but sound continues to work. After continuing to turn TV off/on up to a dozen times, it will then work fine indefinitely. Took off back panel and nothing looked visibly wrong with boards. Looking for advice on which board to replace or where to check voltage.
 
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