LG P705 - Headset Path

4. TROUBLE SHOOTING
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Only for training and service purposes
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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)
Yes
No
START
END
Connect the phone to network
equipment and set-up call.
Set-up 1KHz tone out.
No
Yes
No
Change the FPCB.
Yes
Change the U200 (MSM7227A-1-AA) or
Change the main PCB.
Can you hear the 1KHz TONE?
The sine wave appears at
FB903, FB904(TP1)?
Re-contact or test the
new Upper FPCB.
No
Change the IC705(Audio subsystem)
Yes
The sine wave appears at
C706, C707(TP2)?
Re-Solder & Change J900.