Nokia 6020b Service Manual
RM-31
Nokia Customer Care 6(a) - Baseband Troubleshooting Instructions
22
COMPANY CONFIDENTIAL
Issue 1 03/2005
Copyright © 2005 Nokia. All Rights Reserved.
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Display faults 1
Check N2400
Check R2425
and X2400
pin1,12
Check control
signal line if
ok. If yes,
change UEM.
Check battery
and line.
Change L2405
Display
faults 2
Measure
signal from C2407.
Is it
~16 V?
Measure
voltage from
C2424.
Is it ~2,4 V?
Measure
supply voltage
at C2409.
Is it ~4V?
Check L2405. OK?
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
change N2400
Are the LEDs
turned on?
Set phone into local mode.
Set VBATT 4.2V. Start
display test with Phoenix.
Set display and keypad
lights on.
Display
faults
Retest