Sony HCD-GPX33 Service Manual page 20

D-AMP Mount Diagnosis Flow (1/2)
PLAY MUSIC
Yes
Is there audio output from D-AMP Board?
Yes
A
No
Checks 13.5V output of CN200 1pin.
Is the power voltage OK?
Yes
Checks 3V output of CN200 6pin(Main on)
Is the power voltage OK?
Yes
Checks 61V output of CN1001 1pin(PVDD).
Is the power voltage OK?
Yes
Checks OUT terminal-49V output of REG IC1000
Or, Checks GND and OUT Terminal with Tester.
Is it shorted out?
Yes
B
Reinserts the cable or Exchanges.
No
If there are no problems, Checks output of
Switching regulator Board.
Reinserts the cable or Exchanges.
No
If there are no problems, Checks Output of
Main on Output of Main Board side.
Reinserts the cable or Exchanges.
No
If there are no problems, Checks output of
Switching regulator Board.
No
Checks circumference circuit of REG IC1000.
If there are no problems, exchanges IC1000.