I have a Sanyo flat screen TV it turns on but turns back off all the t

I have a Sanyo flat screen TV it turns on but turns back off all the t

Hello I have a Sanyo TV flat screen and the model number is fw50d36f I have problems with it turning off and on it will not stay on to watch anything on it automatically shuts off what is the problem is it easy cheap fix maybe it's a power board

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