Huawei G700-U10 Maintenance Manual page 69

G700-U10 Smartphone
Maintenance Manual
Circuit Analysis
The G-sensor U1201 sends the real-time acceleration information to the CPU through the
I2C0 data bus. EINT3_G_SENSOR and EINT4_G_SENSOR are interrupt signals.
Troubleshooting Process
Figure 10-36 Troubleshooting G-sensor failures
Circuit Signals
Table 10-9 Circuit signals of this section
Signal
VDD18_PMU
VDD28_PMU
EINT3_G_SENSOR Interrupt signal
EINT4_G_SENSOR Interrupt signal
SCL0
SDA0
Issue 1.0 (2013-07-22)
G-sensor failure
Are VDD28_PMU
and VDD18_PMU
normal?
Y
Is the G-sensor
chip normal?
Y
Resolder or
replace U401
Description
Sensor power supply
Sensor power supply
I2C signal, used to read the
acceleration information
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N
Replace U202
N
Resolder or replace U1201
10 Circuit and Failure Analysis
Reference Value or
Waveform
1.8 V
2.8 V
Effective when at low level
When no signal is transferring,
the level is high.
Effective when at low level
When no signal is transferring,
the level is high.
High and low pulses
High and low pulses
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