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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.14 Headset microphone
3.5 pie Headset ÆHS_MIC_BIAS(TP1_R502) Æ HS_MIC_P(TP2_FB503) Æ HS_MIC_P(TP3_C263)
Æ MIC2P PAD of QSC6270(3G disable)
Insert Headset & Make a call
TP1_R502 is About 1.8V ?
Change the LDO(U501)
Change the Main board
No
Yes
Change the Headset
Change the MAIN board
Sine wave appears at
TP2_FB503?
Re-Solder FB503
Change the MAIN board
No
Yes
Sine wave appears at
TP3_C263?
Re-Solder C263
Change the MAIN board
START
Yes
No