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G700-U10 Smartphone
Maintenance Manual
Solution: Check whether the I/O connector is damaged and then follow the procedure shown
in Figure 10-10.
Figure 10-10 Troubleshooting charging failures
Circuit Signals
Table 10-2 Circuit signals of this section
Signal
VBUS
Issue 1.0 (2013-07-22)
Charging failure
Is the charger
properly
functioning?
Y
Is J902 poorly
soldered?
N
Is R909 bearing a
voltage?
Y
Are there CHR_LDO
signals?
Y
Is the battery in good
Y
contact with the
battery connector?
Y
Is the battery
damaged?
N
Reload the software to the phone and
restore the phone to its factory settings
Description
Charging power input
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10 Circuit and Failure Analysis
N
Replace the
charger
Y
Resolder
J902
N
Replace
Q302
N
Replace
U201
N
Repair J901
Y
Replace the
battery
Reference Value
or Waveform
4.2 V
39
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