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

4. Trouble Shooting

4.11 Speaker/Receiver Trouble Shooting (Acoustic Path)

Disassemble the slide case of phone.
Check the soldering
state of R602, R604, C620, C624, C625,
L600-601 @MAIN_PCB
C100,C102,C103,VA100,VA101
@MA I N_FPCB
Disconnect the F-PCB from
the Main Board.
YES
Check the cutting of F-PCB
With the DVM 0 ohm
YES
Play the Key tone.
Check the RCV_N, RCV_P
The signal is a analog
YES
Check the Speaker
contact PAD of the F-PCB
LGE Internal Use Only
START
NO
Receiver has a problem.
Replace the Receiver.
NO
F-PCB has a problem,
Change the F-PCB
NO
U103(ABB) is broken.
Change the board.
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