Power Board Troubleshooting - Hitachi 32PD3000 Service Manual

Power Board Troubleshooting

8.3.
No picture,
no sound
LED is
No
dark?
Yes
No
Fuse F901
is OK?
Yes
C931 (+)
No
voltage ~
5.2V?
Yes
Q933 (G)
No
voltage >
1.0V?
Yes
Operation of
protection
circuit
AV3000 AVC Unit Service Manual
Caution!
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.
Check D901,
D902, etc.
Check D902,
R914, H901, etc.
LED is
lit in
green?
Yes
Relay
S901 is
ON?
Yes
Main switching
regulator
problem
22
No
Check
AV Board
No
Check
S901