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DELL E173FP Service Manual
29
8.2 Trouble Shooting
8.2.1 Main Board
1) No display
Note: 1. If Replace “MAIN-BOARD”, Please re-do “DDC-content” programmed & “WHITE-Balance”.
2. If Replace “Inverter Board” only, Please re-do “WHITE-Balance”
No DC Level
Check Power board, is there DC level output?. Check
U105 pin3=5V, P105 pin2=3.3V? Is there any
shortage or cold solder or PCB trace is disconnected?
Check Correspondent component
Yes. There have OSD show
Connected the Signal cable again,
Check LED status.
LED Green
Replace U102
Scalar IC
Check Power switch is in
Power-on status, and check if
Power switch had been stuck?
Led Orange
OK, Keyboard no stuck
Led orange
Measured RGB (R112, R114) H, V Input
at U102 pin 95, 96, was there have signal?
Check Correspondent
component short/open
Protection Diode and
Signal cable bad?
NG
OK, U102 data OK
Replace Inverter board and
Check Inverter control relative
Re-do White balance
Measured CN104 pin 5 = 5 V?
Measured U101 pin44=5V?
Measured U105
p
in 2= 3.3V?
Yes, all DC level exist
Disconnected the Signal cable (Loose the
Signal cable), Is the screen show Block
WRGB color bars?
No, nothing is show
Connected the Signal cable again,
Check LED status.
Led Green
Check the Wire-Harness from CN101
OK, Wire tight enough
Check Panel-Power Circuit Block
OK, Panel Power
Check U200 Data-output Block
OK, input Normal
Measured Crystal X101
OK, clock normal
Replace U102 (GMZan3SL)
OK