Acer X173 Service Manual page 37

5. No Backlight
Check C802 (+) =12V
OK
Check ON/OFF signal
Check IC801 pin12=12V?
OK
Check the pin9&10 of IC801 have PWM wave
OK
Check the resonant wave of
pin6 & pin1 for PT801, PT802
Check the output of PT801, PT802
Check connecter & lamp
OK
NG
NG
OK
NM
OK
NG
Change FB801,Q805 Q808, Q810
NG
Check Interface board
NG
Change Q805.Q808 or Q810
Change Q801/Q804/Q811/Q812
OK
Replace IC801
Check Q802/Q803
Change PT801,PT802
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