Dell E173FPc
46
Panel Power Circuit
Inverter Control Relative Circuit
U102-data Output
Measured the inverter connector CN104
Pin1 on/off control=3.3V (on)
Pin2 PWM signal control dim 0V-5V
Replace Inverter board to new one
And check the screen is normal?
OK
Check the BKlt-On relative circuit,
R162, in normal operation, when LED=green,
R162 BKlt-On should=3.3V, If BKlt-On
no-response when the power switch turn
on-off, Replace U101
Check NO SCREEN APPEAR block
NG
NG
OK
Check C158 should have response
from 0V to 5V when we switch the
power switch from on to off
Check the PPWR panel power relative circuit,
Q104, Q105, and check if the soldering for
them is well
OK
NG
Replace Q104，Q105
NG
Replace panel
Replace ZAN3XL (U102) or
replace Main board.
Check ZAN3/XL (U102)
Signal output (PIN5-14, 17-26)
Is the waveform ok?
Replace panel
If Main Board being replaced, please
do the DDC – content reprogrammed
and white-balance adjustment
OK
NG
OK
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