My sanyo dp55441 won't turn on. I replaced the power supply board

My tv just shut off one day and won't turn back on. I replaced the power supply board and still dead. I replaced the power cord and still dead. What should I replace the main board.

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Hi @pg15212 after replacing the power supply board inside, there is still no LED indication or misc? check if there is any voltages to the mainboard

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How do I do that?

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