Speaker/Receiver Trouble Shooting (Common Path) - LG KM710 Service Manual

4.10 Speaker/Receiver Trouble Shooting (Common Path)

Disassemble the slide case of phone.
Check the resistance between
SPK_RCV_P & SPK__RCV_N of the Speaker
With the DVM ~ 8 ohm_
Disconnect The F-PCB from
the Main Board.
YES
Check the resistance between
#37 & #38 of the F-PCB
With the DVM 10 ohm
Check the soldering status
Of CN801 of main -board
YES
Play the Ring tone.
Check the output(#5 & #7) of U603,
The signal is a digital
YES
Check the Speaker
contact PAD of the F-PCB
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Only for training and service purposes
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NO
Speaker has a
problem.
Replace the Speaker.
NO
Check F-PCB connector
If Connector is not a
problem,
Change the F-PCB
NO
Replace the component
NO
1
4. Trouble Shooting
SPK__RCV_N
SPK__RCV_P
LGE Internal Use Only