BenQ Q7T3-FP737S Service Manual page 140

Q7T3(CPT panel) LCD Monitor Service Guide
4. Power Board
Y
Replace Q761
N
Plug CN701 again or
checking I/F BD
N
Plug CN601 again or
checking PW BD
N
Insert them again
Backlight didn't shine
Y
IC751 PIN 9 IS 15V?
N
PWM existed?
(BLT_ADJ)
Y
Turn on level existed?
(BLT_ON)
Y
Check CN752, CN753
Check IC701 OK?
was pluged properly?
Y
Replace IC751,Q751
IC702,D702 or check
LED shined?
N
3.3V existed?
N
Y
N
Y
Checking F601
Broke?
N
Y
Check IC601 Vcc
existed?
N
Replace IC602,
I/F BD
Trouble Shooting
Y
IS I/F board connected?
Y
Replace new fuse
Replace IC701
Replace new fuse
Replace
IC601,ZD601,C606,
C611
N
Replace new fuse
3