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3.9 Audio Trouble
3.9.1 Speaker troubleshooting
Speaker path as below :
MSM8226 -> WCD9302 SPKR_DRVP / SPRK_DRVN -> Speaker
START
After power on, Headphone icon
display on Upper right LCD ?
Change Rear Cover Ass'y
Yes
Speaker Sound can hear?
Change Lower FPCB.
Speaker works well?
Check Main Board
TP1(BUCK_VSW)
TP2(VDD_SPKDRV)
Fail on TP1 -> replace U6100
Fail on TP2 -> replace R6107
End
LGE Internal Use Only
Yes
No
No
Yes
No
Yes
No
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3. TROUBLE SHOOTING
Refer to 3.9.5 Ear-MIC troubleshooting
Abnormal FPCB inspection
TP1 to TP2/TP2 to TP4
Short test. Is it OK?
Headphone path works well?
No
Replace component
U2100 or main board
Copyright © 2014 LG Electronics. Inc. All right reserved.
Rework lower FPCB
TP1(L100), TP2(L101)
No
Yes
Yes
Replace component
U6100
Only for training and service purposes
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Troubleshooting
