U8950 Maintenance Guide V1.0
10 Principles and Failure Analysis
2012-10-22
Huawei Proprietary and Confidential
49
Troubleshooting Process
The startup failure has three types: no current, weak current, or excessive current. Most of
startup failures are caused by power supply exceptions. Troubleshoot the faults as follows:
No current: Power the mobile phone using DC and press and hold the power key. The
current is displayed as 0 mA to 5 mA.
Weak current: Power the mobile phone using DC and press and hold the power key. The
current is displayed as 5 mA to 100 mA.
Excessive current: Power the mobile phone using DC and press and hold the power key.
The current is displayed as over 300 mA.
