Dell E173FP Service Manual page 33

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