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