Q7C3 LCD Monitor Service Guide
Trouble Shooting
4
4. Power Board
Backlight didn't shine
LED shined?
3.3V existed?
IS I/F board connected?
IC751 PIN 9 IS 14-
16V?
Check IC751
PWM existed?
(BLT_ADJ)
Plug CN701 again or
checking I/F BD
Turn on level existed?
(BLT_ON)
Insert them again
Check CN752, CN753
was pluged properly?
Plug CN601 again or
checking PW BD
Replace IC751,Q751
Replace new fuse
Replace new fuse
Check IC701 OK?
Checking F601
Broke?
Check IC601 Vcc
existed?
Replace IC602,
IC702,D701 or check
I/F BD
Replace IC701
Replace new fuse
Replace
IC601,Q602,Q603
R602
Y
N
N
N
N
Y
Y
Y
Y
N
Y
Y
N
N
Y
Y
Y
N
N
N
