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2.) W / LED, No Backlight
Check CN102 pin12 =12V
OK
Check ON/OFF signal
OK
Check U201 pin9=12V
OK
Check the pin1 of U201 have saw tooth wave
OK
Check D201(-) have the output of square wave at short time.
OK
Check the resonant wave of pin2 & pin5 for PT201
OK
Check the output of PT201
OK
Check connecter & lamp
All manuals and user guides at all-guides.com
NG
NG
NG
NG
NG
NG
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Check adapter or MB
Check Interface board
Change Q201 or Q202
Change U201
Check Q203/Q209/Q210/D201
Check Q209/Q210/C213
Change PT201
Lenovo LXM-L19BH
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