Acer AL1516 - Page 37

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5. No Backlight
Check C201 (+) =12V
NG
OK
Change F902
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
Check Q203/Q205/Q207/D201
Check the resonant wave of pin2 & pin5 for PT201
NG
Check the output of PT201
Check Q209/Q210/C213
Check connecter & lamp
OK
NG
Change PT201
OK