Lenovo A328 Service Manual page 20

LENOVO
Speaker does not work
Check Speaker
YES
Check Audio circuit
component visually
YES
Measure Audio PA work
voltage(VBAT)
Normal:3.6-4.2V
YES
Measure Audio PA enable
signal(AUDIO-EN)Normal:2.8V
YES
Check the speaker path
component,Are the components in
place and of correct value/type
Check the BBIC and Audio-PA
soldered again or replace
OK?
NO
NO
NO
Replace
Speaker
Solder again or replace
The damaged component OK?
NO
Check PA VBAT circuit
NO
Check BBIC Soldered
again or replace
NO
Replace damaged/missing
component
YES
END
YES
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