U9500 Maintenance Guide
9 Troubleshooting
Issue 1.2 (2012-6-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
60
Figure 9-30
Handling process for the TP failure
9.2.11 Light Sensor Failure
Cause
Figure 9-31 and Figure 9-32 show the possible reasons that can cause the light sensor failure.
Figure 9-31
Possible reason
The component
is smudged
TP failure
Does the phone resume
its functions after having
the original TP module
group replaced?
Y
Replace the TP
module group.
N
Check whether the TP
power supply is normal.
N
Resolder or replace
U901.
Y
Check whether signals on the
RST, INT, and I2C are normal.
N
Resolder or replace
the signal channel
components.
Y
Resolder or replace J2201.
