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DELL E173FP Service Manual
33
2.) W / LED, No Backlight
Check C201
(
+
)
NG
OK
Change F902
Check D201/Q209/Q210
or
Check ON/OFF signal
Check Interface board
NG
Check U201 pin9=12V voltage
of C905
(
+
)
NG
OK
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
Check Q209/Q210/C213 or
Q211/Q212/C214
Check connector & lamp
NG
Chan
g
e PT201or PT202