Service manual

17" LCD Color Monitor AOC 712Si
36
No Use Of Pressing Key button
White Screen
Check key circuit
is normal
Check U2、pin33、34、35
are defective
OK
Check C33、C38 and C39
NG
Change defective component
NG
Change U2 or solder
solder or bad
NG
Check PWR_EN is
high voltage
Change U2
Check L1 supply voltage
OK
NG
Change Q3、L1
NG
Check output of Pin4 from IC3
OK
Pin 6 oscillate is
normal
NG
Check C81
NG
Change C81
NG
Check IC3
OK
Check D21 voltage is normal
after adjusting current
OK
Change Q6
OK
Check pin1、pin2 is high voltage
OK
Check C82/C85/IC3
NG
Change defective component
NG