BenQ LCD G2320HD Service Manual page 63

23" LCD Color Monitor
(2) No picture
Check if the Pin 4, 7, 8 of CN701 is 5V input
Measure U702 Pin2=3.3 and U704 Pin2=1.2V
X401 oscillate waveforms are normal
Check if the sync signal from
computer is output and video cable is
connected normally
Input the sync signal of computer, or
change the cable
No picture
NG
OK
OK
NG
NG
OK
Check U401
NG
OK
NG
Check power board
Replace U702 and U703
Replace X401
Replace U401
63
BenQ G2320HD