Nokia 7600 - FOR YOUR SAFETY

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