Illumination Fault - Nokia 7600 Troubleshooting Manual

CCS Technical Documentation

Illumination Fault

Start
Are the display
No
LED's working?
Yes
Are the keypad
No
LED's working?
End
Issue 1 (11/2003)
Company Confidential
Replace display module.
Do lights work?
No
Measure voltage on
V400 Cathode.
~18V
~0V
Check V400 and
L400. Are they OK?
Yes
Replace UI-module. Do
lights work?
No
Measure voltage on
R426. Is it ~2.2V?
Yes
Retest
Replace
Yes
N400
Copyright  2003 Nokia Corporation
Company Confidential
Replace Display
Yes
Check X400 and
X3 contacts and
solder joints.
OK?
Yes
Replace
defective part.
No
Replace
N400
Replace
Keypad
Yes
LEDs
Check X400 and
X3 contacts and
solder joints.
No
OK?
Yes
Measure voltage on
V400 Cathode. Is it
~10.5V?
No
Check V400 and L400.
Are they OK?
NMM-3
6-Troubleshooting
Replace
No
defective part.
Replace
N400
Replace
No defective part.
Replace
Yes
N402
Replace
No defective part.
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