Its either bad caps on the PSB-power supply board or the Y-SUS main board is bad or a component has failed on it. Remove the YSUS and take it to a PC repair shop the does board level test and repair. It's more cost effective to rework the exisitting board than to buy a new one. Or you can buy a refurb online. I say PC repair as they are cheaper than your local TV repair person.
Best regards
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