Energy Management Troubleshooting; Device Does Not Stay On - Nokia RH-47 Series Description

Nokia Customer Care

Energy management troubleshooting

Device does not stay on

If the device is switched off without any visible reason, there may be problems in the fol-
lowing areas:
• UEM watchdog problem (WD is not updated by SW)
• BSI line problem (BSI line is floating => contact failure)
• Battery line problem
• Soldering problem
The most likely reason is UEM WD (watchdog), which turns the device off after about 32
seconds if SW is jammed.
This may caused by SW problem, UPP_WD2 problem (Not server by SW), UEM or memory
malfunctions.
The following tests are recommended:
• General power checking
• Clocks
• Memory testing
• Serial Interface
If there is something wrong in the BSI line, the device seems to be dead after the power
key is pressed. However, the regulators of the device are on a few seconds before the
power down.
This mode can easily be detected from the current consumption of the device. After a
few seconds the current consumption drops almost to 0 mA.
In this case, check component or soldering:
• Battery connector X382
EMI-filter R381
UEM D190 (pin number C2)
If phone boots to TEST or LOCAL mode with normal battery, BSI is short circuited to
ground. Check EMI-filter and filtering capacitors, which are located in the BSI.
Issue 1 05/04
Company Confidential
6 - Baseband Description and Troubleshooting
Copyright © 2004 Nokia Corporation
Company Confidential
RH-47
Page 29