AOC M19W531 - Page 42

19" LCD Color Monitor AOC M19W531
42
7.2.2 Power Board
W / LED, No Backlight
Check C201 (+) =12V
NG
OK
Check adapter
Check ON/OFF signal
Check Interface board or main board
OK
NG
OK
Change Q201 or Q202
NG
Check U201 pin9=12V
pin9=12v voltage of C905(+)
Check U201 PIN 10 / 7 have the output of saw tooth wave at short time
Change U201
NG
OK
Check D201/D202 (-) has the output of square wave at short time.
OK
Check Q205, Q207, Q203
Check Q206, Q208, Q204
NG
Check the resonant wave of pin2 & pin5 for PT201/PT202
Check Q209, Q210, C213
Check Q211, Q212, C214
NG
OK
Check the output of PT201/PT202
Change PT201/PT202
NG
OK
Check connecter & lam
p