AOC 712SI - Page 30

17” LCD Color Monitor AOC 712Si
30
No picture（LED orange）
No Use Of Pressing Key button
O
K
Check waveforms of U2、
p
in50 and
p
in51
Change U2
OK
Check U2、
p
in70、
p
in74
NG
Check U5
NG
Chan
g
e U5
OK
Chan
g
e U2
The button under control
NG
Check reset si
g
nal of U2、
p
in17
NG
Check Y1、C29 su
pp
l
y
volta
g
e
NG
Change defective
component
Check U2 su
pp
l
y
volta
g
e
NG
Chan
g
e defective com
p
onent
OK
Check VGA、HS、VS signal
NG
Check if under saving mode
NG
OK
OK
Check key circuit
NG
Check C33、C38 and C39
NG
Change defective component
Check U2、pin33、34、35 are defective
solder or bad
NG
Chan
g
e U2 or solder