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G700-U10 Smartphone
Maintenance Manual
Figure 10-5 Troubleshooting no current startup failures
Issue 1.0 (2013-07-22)
Startup failure
Connect the phone to a fake
battery and maintenance power
supply, power on the phone, and
observe the current
No current
Is the power key
FPC properly
fastened to the
PCBA?
N
Is the power key FPC
faulty?
N
Is the voltage on R1502
between
3.4 V to 4.2 V?
Y
Resolder and
replace U401
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10 Circuit and Failure Analysis
Reconnect
Y
the power
key FPC to
the PCBA
Replace
Y
the
power
key FPC
N
Check
U202
33
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