Huawei Y300 Maintenance Manual page 41

Y300 Maintenance Manual
Figure 9-10 Circuit diagram for charging management (3)
Analysis
The Y300 adopts the charging solution embedded in the PM8029. Three charging modes are
available, including trickle charging, constant current charging, and constant voltage charging.
The charging circuit is VEXT_DC > VCHG > VPH_PWR > Q201 pin 3 > VBAT.
Troubleshooting
Fault symptom: The Y300 fails to be charged due to either of the following causes:
A charger is connected to the Y300 but the Y300 does not respond.
The Y300 displays the charging icon on the screen but in fact the battery fails to be charged.
Handling: Check whether the I/O battery connector is damaged. Troubleshoot the fault
according to the process shown in Figure 9-11.
Issue 1.0 (2013-01-24) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9 Principles and Failure Analysis
36