LG HB620 Service Manual

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.7.3 Loud speaker path (voice speaker phone/VT)
Loud speaker path as below:
MSM6280 HEADSET_R, HEADSET_L → C324,C301 → U805(Audio Codec) → SPK_R, SPK_L →
U301(Speaker/Receiver Selection Switch) → FB302,FB303 → CN502(Main PCB to LCD FPCB
connector) → CN101(LCD FPCB to Main PCB Connector) → OUT1, OUT2(SPK PAD) → Speaker
Start
The sine wave appear at
FB302,FB303
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
YES
change the LCD FPCB
NO
YE
S
YES
END
The sine wave appear at
pads of speaker
?
Change the speaker
Start
The sine wave appear at
FB302,FB303
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Set phone with speaker phone mode
YES
change the LCD FPCB
NO
YE
S
YES
END
The sine wave appear at
pads of speaker
?
Change the speaker
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LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English