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RCA LED55c55r120q not powering on, but power LED is lit

RCA LED55c55r120q not powering on, but power LED is lit

I have a RCA LED55C55R120q that is not powering on, the device is not powering on but the red LED for power is illuminated, I checked the voltages on the power supply, and the only pin with voltage is the 5V on/off pin. should there be the labeled voltages on the power supply pins even while tv is off? When I first press the power button the pins show voltage but it drops down to zero within a second or two. the primary side of the power supply shows constant voltage, but the secondary does not. no capacitors are swollen or blown, and no spots on board appear burnt or discolored. bad power supply or main board??

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