U9500 Maintenance Guide
9 Troubleshooting
Issue 1.2 (2012-6-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
52
Figure 9-19 shows the process for handling the display failure.
Figure 9-19
Handling process for the display failure
9.2.7 Vibration Failure
Cause
Figure 9-20 and Figure 9-21 show the components, damage on which can cause the vibration
failure.
N
Check whether the LCD
backlight power supply's output
is about 27 V.
Check whether the LCD
power supply has ±5.4
V output.
Display failure
Y
Is there nothing
displayed on the
LCD?
Use the replacement test
method to locate where (LCD
or PCBA) the fault is.
N
Y
N
Y
N
Is the LCD properly
installed?
Reconnect the
LCD to the PCBA.
Replace U1601 or
peripheral components.
Replace U1600 or
peripheral components.
Replace the LCD.
Y
