LG H990ds - Audio Sub (3 rd) Microphone Troubleshooting

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3. TROUBLE SHOOTING
It’s operating Hifi Recording > concert mode
Circuit Diagram
Image
Checking Flow
Start
Check the MIC filter
And reconnect PCB
Hear the Voice
through the SPK
in 3mic loopback
test ?
Change
MIC FPCB
No
No
Yes
Change Main Board
End
Yes
Yes
Change damaged
contact pin.
No
Contact pin
(ANT 6013~17)
3.13 Audio sub(3
rd
) MIC
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