Huawei Ascend - During a Call; Touch Panel

Y210 Mobile Phone
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-11-28)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
57
Troubleshooting the Failure that No Sound Can Be Heard by the Other Party
During a Call
Figure 9-34 No sound heard by the other party during a call
No sound can be heard by
the other party during a call
Replace the
microphone. Is the
problem solved?
End
Is the MIC_BIAS voltage
equal to 1.8 V?
Return the phone
to the factory
Check U201
N
N
Y
Re-install the phone's
firmware. Is the
problem solved?
End
Y
Y
N
9.4.14 Touch Panel
Figure 9-35 Touch panel circuit
The Y210's 3.5-inch capacitive touch panel has a touch key area containing three touch keys.
The backlight LEDs for the three touch keys are located on the PCBA. A light guide film is