Huawei Ascend - Charging Management Circuits

Y210 Mobile Phone
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-11-28)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
30
Figure 9-4 Excessive current
Check whether
VPH_PWR and
PM outputs are
short-circuited.
N
Power-on failure:
excessive current
Test the VBAT circuit. Is it
a short circuit?
Is J902 normal?
Re-solder or
replace J902.
N
Y
Replace U401.
N
Is Q201 normal?
Remove U201. Do short
circuits still exist?
Y
Replace Q201.
N
Replace U201.
Y
Y
9.2.2 Charging Management Circuits
Figure 9-5 Charging management circuits