Facing TV Problems? Ask a TV Technician.
Hello, This set doesn't have a Power Supply "Board"- it has the Brick-style AC adapter, and then the Mainboard. I'm assuming you tested the end of the barrel-plug on the AC adapter using a multi-meter to ensure it's delivering the correct DC voltage?
If so, then the Mainboard (at the link below) is the component that needs to be replaced as it distributes the DC voltage produced by the AC adapter:
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