. VIZIO E552VL Picture fades out after a period of time .

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Have picture and sound then picture starts blacking out but still has sound .

Have a Vizio E552VL model

When turning on hooked to my cable everything works for a few minites picture and sound then the picture flickers and goes away there is some elumination to the picture but never comes back still has Ssound . Power board ? Led board? Which one should I replace?

Have the back off no visible damage that is obvious to the boards . When left pluged in and then turned on vizio logo would freeze when turned on and I would have to do a hard reset . Unpluging and holding on button for 30 seconds and pluging in again

That would allowit to get past the frozen Vizio logo and allow the picture to come on full function great picture . After a 5 or 10 minute time frame sometimes longer maybe 30 minites picture would start fading out with horizontal interuption then go black with sound still on . Have a new power board ordered .

Any advise appreciated. Thanks