Denon PMA-2500NE - TROUBLE SHOOTING; Power Indicator LED Not Lit

Check insertion of the connector of the AC1 PCB.
Check insertion of the connector of the POWER SW PCB.
Check insertion of the connector of the DIGITAL PCB.
Check that voltage is supplied to the STANDBY TRANS [T8501]
coil
Check that voltage is supplied to the [D8508 : cathode]
Check that voltage is supplied to [N8507: 5pin]
Check that voltage is supplied to [C8505]
Check that voltage is supplied to the [Q105 : collector]
Check that voltage is supplied to [U103 : 4pin]
Malfunction of [U102].
Broken wire in STANDBY TRANS [T8501]
Malfunction of [D8502 - 8505].
Malfunction of [U8501].
Malfunction of [D8506/8507].
Malfunction of [Q102/Q105].
Malfunction of [U103].
TROUBLE SHOOTING
1. The power cannot be turned on (Power indicator LED is not lit)
NG
NG
NG
NG
NG
NG
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