U8950 Maintenance Guide V1.0
10 Principles and Failure Analysis
2012-10-22
Huawei Proprietary and Confidential
74
No vibration
End
Y
N
Check whether the
vibrator is poorly
soldered.
Y
Re-solder and check
the component.
N
N
Check the
power supply
unit.
Y
Y
End
N
Return the phone to the
manufacturer for repair.
Is the problem
solved after the
software is loaded?
Check whether the vibrator power
supply is normal and the negative
end outputs a lower voltage in the
vibration test.
Does the phone function properly
after having the vibrator replaced.
Circuit Diagram Symbols in this Section
Signal Name
Function
Test Reference Value or
Oscillogram
VPH_PWR
Main power supply,
supplying power to the motor
None
VIB_DRV_N
Motor drive signal pin,
connected to the motor's
negative electrode
None
