G700-U10 Smartphone
Maintenance Manual
10 Circuit and Failure Analysis
Issue 1.0 (2013-07-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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in position, the system will not start up. If the voltage is lower than the UVLO voltage but the
battery is in position, the system will charge the battery. When the battery voltage is high
enough, the system automatically starts up.
Figure 10-4
Power-on sequence when a charger is inserted
Troubleshooting Process
To troubleshoot the startup failure, check whether the I/O interface (battery connector) is
damaged. If the I/O interface is intact, use a DC regulated power supply to supply power to
the phone and test the phone's current.
The power-on failures include the following types:
No current startup failure
Weak current startup failure
Excessive current startup failure
