Service manual

17" LCD Color Monitor AOC 712Si
35
No Picture (LED green)
No picture（LED orange）
The button under
control
Check U2 BL EN is
hi
g
h volta
g
e
Analyse inverter
Check U2、pin50 and pin51
waveforms
Change U2
NG
NG
NG
OK
Change U2
Check C29 and
OK
Change defective
NG
OK
The button under
control
Check reset signal
of U2、
p
in17
Change U2
NG
NG
Check waveforms of
U2、pin50 and pin51
Check Y1、C29
su
pp
l
y
volta
g
e
Change defective
NG
NG
OK
Check U2 supply voltage
Change defective component
NG
OK
Check VGA、HS、VS signal
Check if under saving mode
NG
OK
Check U2、pin70、pin74
OK
Check U5
Change U5
NG
NG
Change U2
NG