Power Board - BenQ Q7C3 Service Manual

Q7C3 LCD Monitor Service Guide

4. Power Board

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