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U8185
Maintenance Manual
Issue 1.0 (2012-03-23)
Power-on failure:
no current
Is the battery
connector J902
normal?
Y
Is Q201 normal?
Y
Re-solder or replace
U201
Weak current
Power-on failure:
weak current
Re-install the phone's
software. Is the problem
solved?
N
Is U201's output
voltage normal?
Y
Does X301 have
32.768 kHz output?
Y
Replace U601 and re-install
the phone's software. Is the
problem solved?
N
Replace U401
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
N
Replace J902
N
Replace Q201
Y
End
N
Replace U201
N
Replace X301
Y
End
9 Principles and Failure Analysis
22
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