CCS Technical Documentation
Baseband Troubleshooting Instructions
Issue 1 10/02
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Nokia Corporation
Page 51
Figure 54: Display faults
Display
faults
Set phone into LOCAL mode.
Start Display Test with Phoenix.
Are the UI-module
LEDs turned on?
Change UI-module
Is it working now?
No
Retest
Yes
Measure
signal from V300 pin
or R306. Is it LOW?
Check X303
Yes
Check R306 if OK.
Measure VBAT
from V300 pin 4.
Is it OK?
No
Check R304
and VBAT
line.
No
Measure
LEDs’ control signal
KLIGHT from R305
(UEM side).
Is it LOW?
Yes
Check control
signal line. If OK
-> change UEM.
No
Check R305,
V300, V329,
and line.
Yes
Display
faults 2
Yes
Check X303
No