That's a classic problem with the Polaroid TVs.
Most of the time it is problem with the power board, but there are a few models - particularily 37'' ones - where the main board goes away.
It will help to know the model of the TV to provide better help, but I bet if you simply google for it you will find the answer yourself.
The 32'' Polaroids from a few years back are *notorious* for this problem.
Bobby, www.coppelltvrepair.com
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