No Picture - BenQ E2220HD Service Manual

21.5" LCD Color Monitor

(2) No picture

Check if the Pin 7, 8 of CN701 is 5V input
No picture
OK
Measure U702 Pin2=3.3V
Measure U704 Pin2=1.2V
OK
X401 oscillate waveforms are normal
OK
Check U401
OK
Check if the sync signal from
computer is output and video cable
is connected normally
NG
Input the sync signal of computer, or
change the cable
NG
Check power board
NG
Replace U702 and U704
NG
Replace X401
NG
Replace U401
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BenQ E2220HD