Baseband Troubleshooting Instructions
CCS Technical Documentation
Page 52
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Nokia Corporation
Issue 1 10/02
Display
faults 2
Are the display
LEDs turned on?
Measure signal
from V301 pin 3.
Is it LOW?
Check LEDs
and line.
Measure VBAT
from V301 pin 4.
Is it OK?
Check R307
and VBAT
line.
Measure
LEDs’ control signal
KLIGHT from R305
(UEM side).
Is it LOW?
Check control
signal line.
If OK ->
change UEM.
Check R305,
V301, V329,
and line.
No
Yes
No
No
Yes
No
Yes
Display
faults 3
Yes