Acer X233HZ Service Manual page 36

2.) No Backlight
Check if the input voltage of inverter part is 16V
Check ON/OFF signal
Check IC801 PIN12=14.5V
Check IC801 PIN5 have triangle wave
Check IC801 PIN9/PIN10 PWM wave
Check connecter & lamp
OK
NG
OK
NG
OK
NG
NG
OK
NG
OK
Check the output of PT801
OK
NG
Check adapter part
Check Interface board
Check ON/OFF circuit
Change IC801
Check R816/R817/R818/R819
Change PT801
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