Optima L903AD+ Service Manual page 43

19" LCD Color Monitor
2.) W / LED, No Backlight
Check CN902 pin2/4 = 12V
Check ON/OFF signal
Check U201 pin9=12V
Check U201 PIN7/10 have the output of square wave at short
Check the output of Q203,Q204
Check the output of PT201, PT202
Check connecter & lamp
OK
NG
OK
NG
OK
NG
OK
OK
NG
OK NG
Check adapter or MB
Check Interface board
Change Q201 or Q202
NG
Check U201 PIN7/10,or change U201
Change Q203,Q204
Check PT201, PT202
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Optima L903AD+