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RM-12
Touchscreen
Start
Phone is working normally.
Display and backlight ok.
touchscreen is not working.
Check A-cover and A-frame
Try new display
that they are ok and do not
module. Calibrate
touchscreen.
Is
touchscreen
No
working?
Yes
Change display
module and
calibrate
touchscreen
End
Issue 1 11/2004
Image in screen. Only
press touchscreen.
Check V28/
VTouch from
L4400. OK?
Yes
Check touchscreen
connector X4421,
filtering components
R4440 L4420 L4423-
L4425 C4402-C4409
R4460-R4463.
Press touchscreen
when measuring this
Check controller
No activity
ChipSelect from
R4400
Toggling
Reflash phone
Touchscreen
No
working?
Yes
Calibrate
touchscreen.
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Check L4400
Goto Power
C4400 C4401
Troubleshooting
components.
Not OK
Change faulty
Check touchscreen
components.
calibration and
Touchscreen
recalibrate if not ok.
working?
Change
N4400.
No
Working?
Yes
Yes
Nokia Customer Care
End
Phone already
Yes
reflashed?
No
Reflash phone
Touchscreen
working?
No
Go to OMAP
troubleshooting
63
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Troubleshooting
