Huawei E5331 - Display Failure

E5331 Maintenance Manual Basic Version V1.0
Internal
2012-4-21
Huawei confidential. No spreading without permission.
Page 40 of 57
9.6 Display Failure
Reference Figure 9-6
Display Failure
Replace the LED, check
whether it is normal?
End
Replace the U3101
Y
N
Measure whether
power supply voltage of the LED
is normal?
Check the
battery
/Replace the
U3801
N
Y
Measure whether
the
R3908/R3909/R3914/R3910/R3911/R391
5/Q3902/Q3903/Q3904/Q3905
are normal?
Replace the
faulty
components
N
Y