Speaker failure
(automatic MMI)
Is the test
passed after the rear cover
is installed?
Yes
The 1 kHz single-tone speaker and
the PCB resonate to produce noise,
resulting in high THD. The test is
passed after the rear cover is
installed. Ask the audio R&D
engineers to handle the problem
No
Are the
speaker dust filter
and vibration diaphragm
complete and
clean?
No
Noise
Speaker failure (manual MMI)
No sound
Is there no sound
occasionally?
Yes
The components
are improperly
installed in the
production line.
Ask the PQE to
take corrective
measures
Rplace main FPC and
subboard
Reassemble the
components
Is the impedance
between SPKOUT_P
and SPKOUT_N
normal?
No
Is the clasp of the main FPC and
subboard abnormal
Is the speaker
FPC missing or installed
improperly?
No
No
Yes
Perform cross
verification. Is the PCBA
faulty?
Yes
Yes
No
Replace the speaker
and ask the MQE to
analyze the cause
Check whether L2501 and L2502
malfunction or have open solder or
dry joint.
Are the
SPKOUT_P and SPKOUT_N
circuits on the PCBA broken or
short-circuited?
Replace U2501
Yes
I2C communication
failure, which can be
resolved using software
tolerance design
The sound is
high or low at
times
Software calibration fails.
Contact software engineers
or restore the phone to
factory settings
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