Huawei G700-U10 Maintenance Manual page 39

G700-U10 Smartphone
Maintenance Manual
Figure 10-6 Troubleshooting weak 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
Weak current
Are the VCORE,
VAPROC, and
VDD18 voltages
normal?
Y
Is X700's output
frequency 26 MHz?
Y
Resolder or
replace U401
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10 Circuit and Failure Analysis
Reference voltage
values:
VCORE = 1.1 V，
VAPROC = 1.2 V
VDD18 = 1.8 V
N
Resolder or
replace U202
N
Resolder or
replace X700
34