Display Fault - Nokia NHM-7 series Service Manual

NHM–7
Troubleshooting Instructions

Display fault

Display
faults
Set phone into local mode.
Start Display test with Phenix
Are the UI–module
led's turned on ?
Yes
control signal from UEM
Display
faults 2
Page 18
Try change UI module
Is it working now ?
No
Check X303
Measure signal
Yes
from X303 pin. 2.
Is it 128 Hz
~3.3Vp–p ?
No
Check R306 If OK.
No
Measure VBATT
from V300 pin. 4
Is it OK?
Yes
Measure
PWM LED's
No
Is it 128 Hz
~3.8Vp–p ?
Yes
E Nokia Corporation
PAMS Technical Documentation
Yes
No
Check X303
Check R304
and VBATT
Check control
signal line if OK
Change UEM
Check R305,
V300, V329
and line
Retest
line
Issue 1 10/2001