Dell E2009W Panduan Servis - Halaman 32

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Halaman Cetak

Service Manual

Power(include IF +5Vand +3.3V) supply normal but LED off and no

display

Is the key function OK?

Is the low active reset signal at #108 of

IF Board U105 normal?

Is the PWM signal at #125 of IF Board

U105 normal when power AC on?

Upgrade Firmware to Serial Flash U108

by VGA port with ISP_ Tool V4.100.exe

Power(include IF +5Vand +3.3V) supply and display normal only LED off

Is the keypad cable connective OK

Is LED at keypad work OK

Is theLED control signal at 123# of U105

high-low convertible when DC on/off

Is the frequency 14.318MHz at

#127,#128 of IF Board U105?

Yes

END

Yes

Is R165 open?

Is Q107 work normal?

Yes

END

Yes

Press power key to DC on the monitor,

if display ok the process is end, if no

display see the no backlight process

Yes

Reassembly or changing

Change LED

yes

Change R165

Change Q107

Change U105

Change crystal X101

Change C164

Change U105