U8815
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-02-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
23
Table 9-1
List of voltages converted from VHP_PWR by PM8029 power management chip
Troubleshooting Process
Power-on failures are classified into three types: no current, weak current, and high current
and many of them are caused by power supply faults. If failures of these three types occur,
rectify them according to the circuit fault troubleshooting methods.
1.
No current: Connect your handset to DC power supply. Press the
On
key. The displayed
current ranges from 0 to 5 mA.
2.
Weak current: Connect your handset to DC power supply. Press the
On
key. The
displayed current ranges from 5 mA to 100 mA.
