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G700-U10 Smartphone
Maintenance Manual
Troubleshooting Process
Figure 10-55 Troubleshooting microSD card detection failures
Circuit Signals
Table 10-18 Circuit signals of this section
Signal
VMCH
MC1CK
MC1CM0
MC1DA0—MC1DA3 Data signal
SD-DET
Issue 1.0 (2013-07-22)
microSD card
detection failure
Is the microSD card
holder properly
soldered?
Y
Is the power supply to the
microSD card normal?
Y
Are the SD_DET and
other signals normal?
Y
Resolder or
replace U401
Description
Power supply signal
Clock signal
Command signal
microSD detection signal
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Copyright © Huawei Technologies Co., Ltd.
N
Resolder or replace the
microSD card holder
N
Resolder or replace
U201
N
Resolder or replace the
faulty components
Reference Value or Waveform
Normal voltage: 3.3 V
/
/
/
SD-DET is at high level when the
microSD is in position. Otherwise, it
is at low level.
10 Circuit and Failure Analysis
81
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