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G700-U10 Smartphone
Maintenance Manual
Troubleshooting Process
Figure 10-48 Troubleshooting speaker failures
Circuit Signals
Table 10-15 Circuit signals of this section
Signal
SPK_P
SPK_N
Issue 1.0 (2013-07-22)
Speaker failure
Is the speaker normal?
Y
Is the speaker
circuit normal?
Y
Resolder or
replace U201
Description
Differential signal input
Differential signal input
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
N
Replace the
speaker
N
Clear faults
on the circuit
Reference Value or Waveform
PWM signal
PWM signal
10 Circuit and Failure Analysis
74
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