LG KM710 Service Manual - Page 83

Speaker/Receiver Trouble Shooting Acoustic Path

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4. Trouble Shooting 4.11 Speaker/Receiver Trouble Shooting (Acoustic Path) START 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 @MAIN_FPCB NO Receiver has a problem. Replace the Receiver. Disconnect the F-PCB from the Main Board. YES NO Check the cutting of F-PCB With the DVM 0 ohm YES F-PCB has a problem, Change the F-PCB Play the Key tone. NO Check the RCV_N, RCV_P U103(ABB) is broken. The signal is a analog Change the board. YES Check the Speaker contact PAD of the F-PCB LGE Internal Use Only - 84 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4.11 Speaker/Receiver Trouble Shooting (Acoustic Path)
4. Trouble Shooting
- 84 -
YE
S
Receiver has a problem.
Replace the Receiver.
NO
NO
Check the soldering
state of R602, R604, C620, C624, C625,
L600-601 @MAIN_PCB
C100,C102,C103,VA100,VA101
@MA
I
N_FPCB
F-PCB has a problem,
Change the F-PCB
NO
Disassemble the slide ca
se of phone.
Disconnect the F-PCB from
the Main Board.
Check the cutting of F-PCB
With the DVM
0
ohm
Play the Key tone.
Check the RCV_N, RCV_P
The signal is a an
alog
YE
S
START
U103(ABB) is broken.
Change the board.
YE
S
Check the Speaker
contact PAD of the F-PCB