Trouble Shooting - Dell WASHING MACHINE Service Manual

9.2 Trouble shooting

9.2.1 Main Board
No Screen
Measured CN104 pin1 = 3.3 V?
Measured CN104 pin 2= 5V?
Disconnected the Signal cable (Loose the
Signal cable), Is the screen show Block
WRGB color bars?
NG
Connected the Signal
cable again Check LED
status.
Green
Check the Wire-Harness from CN103
OK, Wire tight enough
Check Panel-Power Circuit Block
OK, Panel Power OK
Check U102 Data-output Block
OK, U102 data OK
Replace Inverter board and Check
Inverter control relative circuit
Re-do White balance adjust
Note: 1. If replace "Main-Board", Please re-do "DDC-content" programmed & "White-Balance".
2. If replace "Power Board" only, Please re-do " White-Balance"
OK
Check Power switch is in Power-on
status, and check if Power switch had
Orange
been stuck?
OK, Keyboard no stuck
Check Power board; is there DC level output?
NG
Check U105 pin2=3.3V, U106 pin2=1.8V?
Is there any shortage or cold solder?
OK
Connected the Signal cable again,
check LED status.
Measured RGB (R101, R104,
R105) H/V Input at U102 pin
95,96, Was there have signal?
OK
Measured Crystal X101
OK
Replace U102 (ZAN3XL)
OK
45
Dell E173FPc
Green
Replace U102
Scalar IC
Orange
Check
Correspondent
component
short/open
(Protection Diode)
NG