Acer AL1906

36
No Backlight
Check C201 (+) =12V
NG
OK
Change F902
Check Q203/D201
Check ON/OFF signal
Check Interface board
NG
OK
Check U201 pin9=12V ?
NG
OK
Change Q201 or Q202
Check the pin1 of U201 have saw tooth wave
NG
OK
Change U201
Check D201 (-) has the output of square wave at short time.
NG
OK
CheckQ205/Q207/Q203/Q201or
/Q206/Q208/Q204/D202
Check the resonant wave of pin2 & pin5 for PT201/ PT202
NG
Check the output of PT201/PT202
Check Q206/Q207/C211
Check connecter & lamp
OK
NG
Change PT201/PT202
OK