Acer B243W Service Manual page 37

W/LED No Backlight
Check the 24V voltage input
OK
Check ON/OFF signal
Check the voltage of IC801 pin2
OK
Check the pin1&15 of IC801 have PWM wave
OK
Check Q802,Q804,Q808,Q809
Check the output of PT801~PT812
Check connecter & lamp
OK
NG
Drain wave
NG
OK
NG
OK
NG
Check the adapter
NG
Check Interface board
NG
Change Q805.Q806 or Q807
Replace IC801
Replace Q802,Q804,Q808,Q809
Change PT801~PT812
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