User Guide

Issue 1 12/04 COMPANY CONFIDENTIAL 45
Copyright © 2004 Nokia. All Rights Reserved.
RAE-6/RA-4
6 - Baseband Description and Troubleshooting Nokia Customer Care
■ UI troubleshooting
Are
CSX (D100, pin 6),
SCL (D101, pin 6)
and SDA (D100, pin 4)
lines working
properly?
No
Yes
Are
CSX (D100, pin 1),
SCLK (D101, pin 1)
and SDA (D100, pin 3)
lines working properly
before level
shifter?
No
X100:
Are
VDD (pin4)
and
VDDI (pin 3)
voltage levels
~2.8 and ~1.8V?
No
Yes
Yes
CMT
display
check
No
No
Is
RESX (D101, pin 3)
signal reasonable
before level shifter?
Is
RESX (D101, pin 4)
signal reasonable?
Yes
No
Check level shifters
D100/D101.
Change UI module
if needed.
Check (change
level shifter D101.
Yes
End
Check
flex connector
X4402
on engine PWB.
OK?
Fix connector.
No
Go to EM trouble
shooting
Check
connectors
X100/X101.
OK?
Change UI
flex.
Display physically
broken?
No
No
Yes
Change LCD.
LCD working?
No
Yes
Change adequate
EMI filter(s)
Z4400...4401.
Signals OK?
Yes
No
OMAP FAULT.
Fault is in non-
reworkable component.
Refer to current BER
handling guidance.
Display working now?
Yes
No
LCD working?
Yes
Yes
End
Try with known
good display.
Working?
Yes
Change LCD
Yes
No