Audio - LG KE820 Service Manual

In case of KE820/KG99 mass production, the JTAG & ETM interface connector will not be mount on
board. That is only for developing and software debugging purpose.( It will not be mounted on mass
production PCB)

3.13. Audio

KE820/KG99 Audio signal flow diagram as following diagram.
BBP
PMB8876
FM
Stereo/ Single ended
Si4701
GPIO
Single End
MIC1
Single End
MIC2
DP
Mono/ Differential
EP
DT
SPK_RCV_SEL
GPIO
DP
Amp
EPA
DT LM4845
Stereo Diffential
FM_BBP_SEL
Stereo/ Single ended
FM Antenna
Audio FM
Audio
TX Radio
RX
Figure 21 Audio signal flow diagram
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3. TECHNICAL BRIEF
Differential
Stereo/ Single ended
Receiver & Speaker
Main PCB
Active
Mic.
Stereo head set &
Microphone
Sub PCB