Lenovo LXH-GJ17L3 Service Manual page 38

17" LCD Color Monitor
W / LED, No Backlight
Check C202 (+) =12V
Check ON/OFF signal
Check U201 pin9=12V
Check U201 PIN 10 / 7 have the output of sawtooth wave at short time
Check D201/D202 (-) has the output of square wave at short time.
Check the resonant wave of pin2 & pin5 for PT201/PT202
Check the output of PT201/PT202
Check connecter & lamp
OK NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
Check adapter
Check Interface board or main board
Change Q201 or Q202
Change U201
Check Q205, Q207, Q203
Check Q206, Q208, Q204
Check Q209, Q210, C213
Check Q211, Q212, C214
Change PT201/PT202
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Lenovo LXH-GJ17L3