Lenovo L222 Wide Service Manual page 34

22" LCD Color Monitor
2.) W / LED, No Backlight
Check ON/OFF signal
Check IC801 PIN12=12V
Check IC801 PIN10, 9 have the output of square wave at short time
Check Q804, Q809 PIN5, 6, 7, 8 have the output of square wave at short time
Check the output of PT801, PT802
Check connecter & lamp
Check F902= 12V
OK
NG
OK
NG
OK
NG
NG
OK
OK
NG
OK
NG
Check adapter or MB
Check Interface board
Change Q801
Change IC801
Check Q804, Q805, Q806, Q809, Q810, Q811
Change PT801, PT802
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Lenovo L222 Wide