Speaker/Receiver Trouble Shooting (Acoustic Path) - LG KE500 Service Manual

4. TROUBLE SHOOTING

4.11 Speaker/Receiver Trouble Shooting (Acoustic Path)

Disassemble the slide case of phone.
Disconnect the F-PCB from
the Main Board.
Check the cutting of F-PCB
With the DVM 0 ohm
Check the RCV_N, RCV_P
Check the Speaker
contact PAD of the F-PCB
START
Check the soldering state of
L201,L202,C219,C220,C221
@MAIN_PCB
C105,C106,C107,VA101,
VA102 @MAIN_FPCB
YES
YES
Play the Key tone.
The signal is a analog
YES
L201 L202
C220
C219
NO
Receiver has a problem.
Replace the Receiver.
VA102
C107
NO
F-PCB has a problem,
Change the F-PCB
NO
U103(ABB) is broken.
Change the board.
- 90 -
C221
C105
VA101
C106