Display Faults - Nokia NSB-9 Service Manual

NSB-9
Troubleshooting Instructions

Display faults

Display
faults
Set phone in LOCAL mode.
Start Display test with Phoenix
and turn LEDs on.
Are the display
module LED´s
turned ON?
Yes
Display
faults 2
Page 70
Try to change
display module.
Is it working now?
No
Measure signal from
X300 pin 10.
Is it 10 – 14V?
No
Check R306. If OK
measure VBAT from
N300 pin 1.
Is it OK?
Yes
Check LED driver
control signal from
N300 pin 8.
Is it high?
Yes
Nokia Corporation
CCS Technical Documentation
Yes
No
Check
X300
Yes
Check X300
No
Check C300 and
VBAT line
No
Check control
signal line. If OK
change UEM.
Check N300, C301, V300,
L300, C302, R318 and
change defect componenet
Retest
Issue 1 04/03