Dell E173FP service manual LED, No Backlight

2.) W / LED, No Backlight

Check C201 (+)

NG

OK

Check ON/OFF signal

NG

Check U201 pin9=12V voltage of C905(+)

NG

OK

DELL E173FP Service Manual

Change F902

Check D201/Q209/Q210 or

Check Interface board

Change Q201 or Q202

Check the pin1 of U201 have sawtooth wave

NG

OK

Change U201

Check D201(-),D202(-) have the output of square wave at short time.

NG

OK

Check Q205/Q207/Q203/D201 or Q206/Q208/Q204/D202

Check the resonant wave of pin2 & pin5 for PT201/PT202

NG

Check the output of

NG

Check Q209/Q210/C213 or Q211/Q212/C214

Change PT201or PT202

Check connector & lamp

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