Dell 2208WFP Service Manual page 37

Service Manual
Power(include IF +5Vand +3.3V) supply normal but LED off and
no display
Is the key function OK?
Is the frequency 14.318MHz at #15,#16
Is the low active reset signal at #4 of IF
Board U108 normal?
Is the serial clock and date signal at #33,
#35 of IF Board U108 normal when
power AC on?
Upgrade Firmware to MCU 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 1# of U108
high-low convertible when DC on/off
NO
of IF Board U108?
Yes
Yes
Yes
END
Yes
Yes
Is R165 open?
NO
Is Q107 work normal?
Yes
END
36
Yes
Press power key to DC on the monitor,
if display ok the process is end, if no
display see the no backlight process
NO
NO
NO
NO
Reassembly or changing
NO
Change LED
yes
Change R165
NO
Change Q107
NO
Upgrade Firmware to MCU U108
Change crystal X101
Change U108
Change U108