Dell E173FP - 17" LCD Monitor Service Manual page 33

2.) W / LED, No Backlight
Check C201 (+)
Check ON/OFF signal
Check U201 pin9=12V voltage
of C905(+)
Check the pin1 of U201 have sawtooth wave
Check D201(-),D202(-) have the output of square wave at short time.
Check the resonant wave of pin2 & pin5 for PT201/PT202
Check the output of
Check connector & lamp
NG
OK
NG
NG
OK
NG
OK
NG
OK
NG
NG
DELL E173FP Service Manual
Change F902
Check D201/Q209/Q210
Check Interface board
Change Q201 or Q202
Change U201
Check Q205/Q207/Q203/D201 or
Q206/Q208/Q204/D202
Check Q209/Q210/C213 or
Q211/Q212/C214
Change PT201or PT202
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