Power on problem

I have a 2009 40 inch LCD Model number LN40853oP7NXZA. If I turn if off it is hard to turn back on. It will finally turn on after many attempts, like a power supply on a PC might do. I have been just leaving on and it will stay on without shutting off. The minute I do turn it off same problem again. I would like to resolve the problem if I could. I have called a few people in my area and nobody repairs these. If it is something as simple as a circuit board I could replace myself. Thanks for any help on this. Tom
Power on problem

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