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Samsung TV F8500 is flashing - need expert advice

Plasma Flat Panel Displays - www.avsforum.com
Samsung TV (model PN51F8500AFXZA) started flashing almost right after the warranty was over. Sometimes I can see flashing contains part of a previously displayed picture or menu. Please video sample of flashing in the attachment of this post and in this you tube link:

I have tried all of the samsung recommended troubleshooting steps including turning off all options that could cause this including all eco options and every auto option on the TV with no success.

The TV started to power cycle as well. I changed out the ysus main board and this fixed the power cycling problem and seemed to fix the flashing problem as well. However, the flashing problem returned and has progressively gotten worse until I can't watch the TV any longer. I have also changed out the y-buffer recently but the problem persists.

What could possibly be causing this?
Date: Sep 26, 2017   


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