Nokia 2650 - Power Does Not Stay on or Phone Is Jammed

Issue 2 06/2005 COMPANY CONFIDENTIAL 9
Copyright © 2005 Nokia. All Rights Reserved.
RH-53/54
Nokia Customer Care
■ Power does not stay on or phone is jammed
If this kind of failure is presenting itself immediately after FLALI, it is most likely caused by
ASICs missing contact with PWB.
If for some reason the MCU does not service the watchdog register within the UEM, the oper-
ations watchdog will run out after approximately 32 seconds. Unfortunately, the service routine
can not be measured.
Figure 5:Phone jammed troubleshooting
Power doesn't stay on,
or phone is jammed
J404
Sleep clock = 32.768 kHz,
1.8Vpp
Yes
Check :
D450, Keymat,
Lightguide, PWB.
Else defective D400*
UI functionality,
and keys react
to pressure?
Check :
PWB.
Else defictive D200*
Yes
No
No
J402
PURX = 1,8VDC,
1 sec. after power-key is
pressed
Check :
C420, C426, R420,
R426, N600(Mjoelner)
Yes
No
Yes
Reflash phone
Check :
B200, C209, C210, PWB.
Else defective D200*
No
R426
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M
Check :
D450 (Flash)
Yes