User Guide

6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting Nokia Customer Care
Page 60 ©2005 Nokia Corporation Company Confidential Issue 2 05/2005
Display Faults
Main Display
Main
Display
faults
Main
Display
faults,
page 2
Are the UI module
and display LEDs
turned on when the
mobile terminal is
turned on or when
making a call?
Measure KLIGHT at
R2455, Vbat at
C2451, and Pout at
C2453. Are they OK?
If Vbat is not OK,
check the battery. If
Pout is not OK,
check N2450.
Measure test point
X2453 (~>12). Is it
OK?
Measure the
KLIGHT.
Is the signal OK?
Change UEM
Check display
module. Is it OK?
NO NO
YES
NO
YES
YES
Check X2463. Is it
OK?
YES
Replace
NO
Replace
NO
YES
Replace display
module.
NO
Retest
YES