Dell WASHING MACHINE Service Manual page 46

Panel Power Circuit
Check C158 should have response
from 0V to 5V when we switch the
power switch from on to off
Replace panel
Inverter Control Relative Circuit
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?
U102-data Output
Check ZAN3/XL (U102)
Signal output (PIN5-14, 17-26)
Is the waveform ok?
Replace panel
OK
OK
OK
OK
Check the PPWR panel power relative circuit,
NG
Q104, Q105, and check if the soldering for
them is well
Check the BKlt-On relative circuit,
NG
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
NG
Check NO SCREEN APPEAR block
NG
Replace ZAN3XL (U102) or
replace Main board.
If Main Board being replaced, please
do the DDC – content reprogrammed
and white-balance adjustment
46
NG
Replace Q104，Q105
OK
Dell E173FPc