3. TROUBLE SHOOTING
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3.18.2 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 )
Yes
No
START
END
Connect the phone to network
equipment and set-up call.
Set-up 1KHz tone out.
No
Yes
Re-Solder & Change CN7001 or change
the main PCB
No
Change the U4001 (PMIC)
Yes
Change the U2000 (MSM7225A) or
Change the main PCB
Can you hear the 1KHz TONE?
The sine wave appears at
FB7003, FB7002(TP1)?
The sine wave appears at
C4040, C4041(TP2)?