Acer X233H Service Manual - Page 36
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2.) No Backlight
Check CN902 pin4, 5 = 14V
Check ON/OFF signal
Check IC801 PIN12=12V
Check the PWM wave from the pin9,10 of IC801
Check Q802, Q803 PIN5, 6, 7, 8 have the
output of square wave at short time.
Check the output of T801, T802
Check connecter & lamp
NG
OK
NG
OK
OK
NG
OK
NG
OK
OK
NG
Check the adapter or MB
Check Interface board
NG
Change Q808
Change IC801
Change Q802, Q803
Change T801, T802
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