Huawei E5331 - No Power On-Small Current (DC Power Supply)

E5331 Maintenance Manual Basic Version V1.0
Internal
2012-4-21
Huawei confidential. No spreading without permission.
Page 34 of 57
9.2.2 No Power On—Small Current (DC Power Supply)
Reference Figure 9-2
Small Current
Measure whether
output signal value of the X3501
is normal?
Replace the
X3501
Replace U3201, check
whether it is normal?
Replace the U3101
Y
N
Measure whether
output voltages of the U3501 are
normal?
Y
Replace the
U3501
N
N
EndY
Download the
latest software version, check
whether it is normal?
End
N
Y
U201 Output
Reference Value
Test Point
VDD_2V6
2.6V
C3512
LDO5
/
C3507
VDD_PMU
3.1V
C3533
V_CORE_1V8
1.8V
C3505
VREF
2.6V
C3514
VDD_2V8
2.8V
C3511
VBUCK5
2.85V
C3521