AOC 196V Service Manual page 36

2.) W / LED, No Backlight
Check C201 (+) =12V
OK
Check ON/OFF signal
OK
Check U201 pin9=12V
OK
Check the pin1 of U201 have sawtooth wave
OK
Check D201/D202 have the output of square ware at short time
OK
Check the resonant wave of pin2 & pin5 for PT201/PT202
OK
Check the output of PT201
OK
Check connecter & lamp
NG
Change F902
NG
Check main board
NG
Change Q201 or Q202
NG
Change U201
NG
Check Q205/Q207/Q203/D201
Check Q206/Q208/Q204/D202
NG
Check Q209/Q210/C213
Check Q211/Q212/C214
NG
Change PT201
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AOC 176V