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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.13.3 Loud speaker path (voice speaker phone/VT)
Loud speaker path as below:
MSM6280 LINE_ON, LINE_OP
→
C414,C418
→
R404,R406
→
C415,C419
→
R405,R407
→
U400(audio codec)
→
FB400,FB401
→
U401( SPK/ RCV Switch)
→
FB402, FB403
→
CN601 (FPCB
connector)
→
SPK PAD
→
Speaker
Start
The sine wave appear at
C414,C418 ?
Change th e Main bo ard
NO
Connect th e phone to network
Equipm ent a nd setup c all
Setup 1KHz tone out
Set phone with speaker phone mode
The sine wave appear at
FB400, FB401?
YES
Check t he U400 or
Change th e Main bo ard
NO
Check t he CN601
NO
YES
YES
Can you hear the tone?
Change th e sp eaker
NO
YES
END
The sine wave appear at
pads o f speaker ?