Huawei U8860 Maintenance Manual page 40

U8860
Maintenance Manual
PM voltage output table:
Signal
VREG_L3_1P8/3P3
VREG_MSM_USB3V3
VREG_MSM_USB1V8
VREG_CAM_2P85
VREG_MSM_A2_2V05
Issue 1.0 (2011-11-14)
Power-on failure-weak
current
Is the problem solved after the
software is loaded?
N
Are the X401(19.2MHz) output and
X402(32.768KHz) output normal?
Y
Are all channels of output voltage of the
PM (U301) normal? (refer to the PM
voltage output table)
Y
Is the problem solved after U1701 is
replaced?
N
Replace U201.
Reference Value for the Output Voltage
1.8/3.0V
3.0V
1.8V
2.85V
2.85V
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9 Principles and Troubleshooting
Y
End
N
Replace the faulty
components.
N
Replace U301.
Y
End
Test Point
C449
C469
C470
R4411
C456
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