Samsung tv#ln40A530P1FXZA dead samsung tv

  • Samsung model#LN40A530P1FXZA completely dead, tested power supply by disconnecting main board from power supply,have standby 5.3v, when i short pin 1 standby voltage with pin 3 power on, all other pins read correct per legend stamped on board, when i connect main board back to power supply & take readings again i get steady standby voltage 5.3v all other pins voltages are erratic, have replaced main board with what i was told compatibleboard (different part #) it did not work, sent it back. Is it bad main.
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