U8950 Maintenance Guide V1.0
10 Principles and Failure Analysis
2012-10-22
Huawei Proprietary and Confidential
65
Signal Name
Function
Test Reference Value or Oscillogram
SDC3_DATA1
Data line
SDC3_DATA0
Data line
SDC3_DATA7
Data line
SDC3_DATA6
Data line
SDC3_DATA5
Data line
SDC3_DATA4
Data line
SDC3_CLK
Clock
SDC3_CMD
Command
VREG_DCDC_2P8
5
Flash power
2.9 V
VREG_S3
Power supply
2.9 V
MSM_RESOUT_N
Reset signal
VPH_PWR
2.85 V system
power supply,
which supplies
power to
the DC/DC chip.
10.2 RF Unit
Circuit Block Diagram
