LG -E410 Service Manual page 91

4.18.2 Headset path
MSM7225A-0-AB LINE_OP, LINE_ON -> C4040, C4041(TP2) -> U4001 (PM8029 : PMIC) ->R7001, R7000 -> FB7003,
FB7002(TP1) -> CN7001 ( 3.5pi Ear-jack )
Connect the phone to network
Can you hear the 1KHz TONE?
Change the U2000 (MSM7225A) or
LGE Internal Use Only
START
equipment and set-up call.
Set-up 1KHz tone out.
No
The sine wave appears at
FB7003, FB7002(TP1)?
No
The sine wave appears at
C4040, C4041(TP2)?
No
Change the main PCB
Yes
END
Yes
Re-Solder & Change CN7001 or change
the main PCB
Yes
Change the U4001 (PMIC)
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4. TROUBLE SHOOTING
Only for training and service purposes