Charging Management Circuits - Huawei Ascend Maintenance Manual

Y210 Mobile Phone
Maintenance Manual
Figure 9-4 Excessive current

9.2.2 Charging Management Circuits

Figure 9-5 Charging management circuits
Issue 1.0 (2012-11-28)
Power-on failure:
excessive current
Test the VBAT circuit. Is it
a short circuit?
Y
Is J902 normal?
Y
Is Q201 normal?
Y
Remove U201. Do short
circuits still exist?
N
Replace U401.
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Check whether
N
VPH_PWR and
PM outputs are
short-circuited.
N
Re-solder or
replace J902.
N
Replace Q201.
Y
Replace U201.
9 Principles and Failure Analysis
30