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Sanyo DP39E23 turns on for 15 minutes then the screen goes black

Hi!

I have a Sanyo DP39E23 that I got from a family member. They gave it to me because it would work perfectly for a while and then the screen will go black with the audio still running. I looked into getting a different main board as that sounds to be a common problem, but I’m not sure if the board is even faulty. What should I do?

Edit: The power supply makes an audible whine when the backlight goes out. Also, it seems that one of the corners warms up but none of the other do.

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Allen Hauser could be a power board issue or a backlight issue. When the screen turns dark, in a darkened room, shine a flashlight beam at an angle against the screen. If you can make out shapes/silhouettes you know it is the backlight (possibly backlight LED strips). If you do not then you will have to remove the back cover and check the power board and main board connectors to see if the voltages are as required. Post some pictures of your boards with the question so we can see what you see.

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Allen Hauser will be eternally grateful.
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