Denon DHT-S514 - Trouble Shooting; Check 24 V; Check 5.2 V; Check 5 V(SW5 V)

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TROUBLE SHOOTING
Check the each voltage
1. Check 24V
Check the voltage pin 1 of J5 conector.
Is the voltage in the specication? (24V±10%)
Start (MAIN PWB)
Finish
Replace the AC Adaptor.
NO
2. Check 5.2V
YES
Check the input voltage 5 pin of U27.
Is the voltage in the specication? (24V±5%)
Is a PWM being output from 6 pin of U27?
Start (MAIN PWB)
Finish
Check the soldering of the L45.
1. Check the soldering of D7, D9, C294, L43, R230, R231
and R232.
2. Check the soldering of the U27.
NO
NO
YES
YES
3. Check 5V(SW5V)
Check the input voltage 2 pin of U29.
Is the voltage in the specication? (24V±5%)
Is a PWM being output from 8 pin of U29?
Start (MAIN PWB)
Finish
Check the soldering of the L49.
1. Check the soldering of D8, C315, C316, L46, R235, R236
and R2383.
2. Check the soldering of the U21
NO
NO
YES
YES