Per magnavox 37mf231d I switched tcon board, and put an older main board that I had laying around, now the tv tries to turn on, there is a background light for about 5 seconds and then it shuts off.

Do you think it is still the main board?

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Terry Dovre

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Hello, I think it either had a bad back light board or one of the florescent tubes in the display has gone bad. As these sets get older, I see more of the florescent tubes going bad. I think there are 9 in that set, and all it takes is one of them to go out to cause the set to shut down. You may also look for a bad connection on the transformers on the back light board.....thanks, let me know

Posted on Aug 07, 2014

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