Huawei U8655N Maintenance Manual page 33

U8655
Maintenance Manual

Excessive current is caused by short circuits. When excessive current occurs, to prevent
damage to components, do not connect the charger to the phone. Power-on failure due to
excessive current is usually the result of short-circuited VBAT circuit.
Issue 1.0 (2012-02-23)
Powe-on failure:
weak current
Reinstall the phone's
firmware. Is the problem
solved
N N
Is U201'output
Voltage normal
Y Y
Does X301 have
32.768 kHz output?
Replace U601 and reinstall
The phone's firmware. Is the
Problem solved?
Replace U401
Excessive current
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Y Y
N N
N N
Y Y
N N
9 Principles and Failure Analysis
End
Replace U201
Replace X301
Y Y End
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