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Nokia 6020b Service Manual

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Issue 1 03/2005
COMPANY CONFIDENTIAL
23
Copyright © 2005 Nokia. All Rights Reserved.
RM-31
6(a) - Baseband Troubleshooting Instructions
Nokia Customer Care
■ 
Display faults 2
Measure
VDD (2.78V) 
and VDDI (1.8V).
Is it OK?
Measure
RESX, CSX.
Is it ~1.8V?
Check X2400 
and lines. If 
OK, change 
UPP.
 Change UEM
Check X2400
No
Yes
No
Yes
No
Yes
No
Yes
Retest
Display
faults
2
Does
the display
work?
Change
UI module. Is it
working?
End
Open Phoenix, enter Test mode 
and goto Testing > Display  Test > 
Select Test > Contrast Test. Set 
the height and width values to 128 
respectively.Then click Send to 
Phone
Is there a clear 
difference on the 
Grey scale?
Yes
No