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No Backlight
Check C201 (+) =12V
OK
Check ON/OFF signal
OK
Check U201 pin9=12V ?
OK
Check the pin1 of U201 have saw tooth wave
OK
Check D201(-), D202(-) have the output of square wave at short time.
OK
Check the resonant wave of pin2 & pin5 for PT201/ PT202
OK
Check the output of PT201/PT202
OK
Check connecter & lamp
All manuals and user guides at all-guides.com
NG
NG
NG
NG
NG
NG
Check Q209/Q210/C213 or Q211/Q212/C214
NG
46
Change F902
Check D201/Q209/Q210/
D202/Q211/Q212
Check Interface board
Change Q201 or Q202
Change U201
CheckQ205/Q207/Q203/Q201or
/Q206/Q208/Q204/D202
Change PT201/PT202
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