Huawei G700-U10 Maintenance Manual page 65

G700-U10 Smartphone
Maintenance Manual
Troubleshooting Process
Figure 10-32 Troubleshooting front camera failures
Circuit Signals
Table 10-7 Circuit signals of this section
Signal
VCAM_AVDD
VCAM_DOVDD
SUBCAM_PDN
SUBCAM_RST
CMMCLK
SUBCAM_CLKN/P Pixel clock for the system
SCL1
SDA1
SUBCAM_D0N/P
Issue 1.0 (2013-07-22)
Front camera failure
Is the front camera
normal?
Y
Is the front camera BTB
connector normal?
Y
Is the power supply to the
Y
front camera normal?
Y
Is the MIPI signal
normal?
Y
Replace U401
Description
Camera analog power supply
Camera digital power supply
Camera power supply enabling signal
Camera initialization signal
Reference clock for the camera; 24
MHz
Camera I2C signal for transmitting
control and configuration data
MIPI differential data signal
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N
Replace the rear camera module
Resolder or replace the BTB
N
connector
Check the three power supplies near
N
J1001 and then check U202
N
Resolder or replace T1001, T1002,
T1003, T1004, or T1005
10 Circuit and Failure Analysis
Reference Value or
Waveform
2.8 V
1.8 V
Effective when at high
level (operating)
Effective when at low
level
The operating level is
high.
Digital pulse signal
MIPI differential clock
Digital pulse signal
Digital pulse signal
Differential data signal
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