Audio Troble - LG P705 Service Manual

4.19 Audio Troble

4.19.1 Receiver Path
MSM7227A-1-AA RCV_N / RCV_P -> CN900 (TP1) (RCV pad)
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
CN900 (TP1) ?
No
Re-contact or test the new
Upper FPCB.
No
Change the main PCB.
Yes
END
Yes
Re-solder or test the new RCV. (If it's OK,
Change the RCV.)
Yes
Change the FPCB
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4. TROUBLE SHOOTING
Only for training and service purposes