Hitachi 32PD3000 - Power Board Troubleshooting

22
AV3000 AVC Unit Service Manual
8.3.
Power Board Troubleshooting
Yes
Check D901,
D902, etc.
No
No
Always confirm that C907 (CE220uF/450V) is discharged prior to
touching the POWER Board with fingers or soldering iron after
power-off to prevent electric shock and secondary damage.
Caution!
No picture,
no sound
LED is
dark?
Yes
Yes
Yes
No
No
Yes
No
No
Fuse F901
is OK?
C931 (+)
voltage ~
5.2V?
Check D902,
R914, H901, etc.
Relay
S901 is
ON?
Main switching
regulator
problem
LED is
lit in
green?
Yes
Check
AV Board
Check
S901
Operation of
protection
circuit
Q933 (G)
voltage >
1.0V?