LG HB620 Service Manual

4.7 Audio trouble
4.7.1 Receiver path
Voice Receiver path as below:
MSM6280 Ear1ON/Ear1OP → U304(Speaker/Receiver Selection Switch) → CN502(Main PCB to
LCD FPCB connector) → CN101(LCD FPCB to Main PCB Connector) → OUT1, OUT2(Receiver
PAD) → Receiver
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Only for training and service purposes
4. TROUBLE SHOOTING
- 84 -
Start
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Can you hear the tone?
YES
END
CheckCN502(Main),CN101
(LCD FPCB) Connector or
Change the LCD FPCB
YES
Change the Receiver
Hear the tone to the receiver ?
NO
END
Work Well
NO
NO
Change the main Board
Start
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Can you hear the tone?
YES
END
CheckCN502(Main),CN101
(LCD FPCB) Connector or
Change the LCD FPCB
YES
Change the Receiver
Hear the tone to the receiver ?
NO
END
Work Well
NO
NO
Change the main Board
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LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English