LG -P715 Service Manual page 96

4.13.2 Headset path
MSM8225 HPH_R, HPH_L -> C6011, C6012(TP2) -> M6001 (TPA2058D3: Audio Subsystem) ->FB6001, FB6002(TP1) ->
J6001 ( 3.5pi Ear-jack )
Connect the phone to network
equipment and set-up call.
Set-up 1kHz tone out
Can you hear the 1kHz Tone?
The Sing wave appear at
FB6001, FB6002 (TP1)
The Sing wave appear at
C6011, C6012(TP2)
Change the U2001
or Change the Main PCB
LGE Internal Use Only
START
No
No
No
Yes
END
Yes
Change the main PCB
Yes
Change the M6001 (Audio subsystem)
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4. TROUBLE SHOOTING
Only for training and service purposes