Headset Path - LG P705 Service Manual

4.19.2 Headset path

MSM7227A-1-AA HPH_ L / HPH_R -> C706, C707(TP2) -> IC705 (TPA2055D3:Audio Subsystem) -> R710, R711 -> FB903,
FB904(TP1) -> J900 (3.5pi Ear-jack)
Connect the phone to network
Can you hear the 1KHz TONE?
Change the U200 (MSM7227A-1-AA) or
LGE Internal Use Only
START
equipment and set-up call.
Set-up 1KHz tone out.
No
The sine wave appears at
FB903, FB904(TP1)?
No
Re-contact or test the
new Upper FPCB.
No
The sine wave appears at
C706, C707(TP2)?
No
Change the main PCB.
Yes
END
Yes
Re-Solder & Change J900.
Yes
Change the FPCB.
Yes
Change the IC705(Audio subsystem)
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4. TROUBLE SHOOTING
Only for training and service purposes