Audio - LG KC550 Service Manual

3. TECHNICAL BRIEF

3.13 Audio

KC550 Audio signal flow diagram as following diagram.
Analog SWICH
HSO_L
DBB
SND_N HSO_R
SND_R
AMPIN_L
AMPIN_R
HS_SEL
FM_SND_L
BT/CSR
FM_SND_R
MIC_N
MIC_P
HS_MIC_N
HS_MIC_P
EAR_N
EAR_P
LGE Internal Use Only
1uF
AMP
LIN2
1uF
RIN2
1uF
LIN1
15p
1uF
RIN1
15p
1uF
LIN3
MIC_N
1uF
LIN4
MIC_P
RIN3
1uF
HS_MIC_N RIN4
1uF
HS_MIC_P
0 ohm
N.A 27p
0 ohm
0.1uF
0.1uF
0 ohm
47p
47p
0 ohm
Figure 20 Audio signal flow diagram
27p
27p
100uF
LOUT
100uF
ROUT
decoding
AMD
I2S
encoding
120ohm,Bead
SPKP
47p
27p
120ohm,Bead
SPKN
47p
100nH 0.1uF
100nH 0.1uF
27p
1.5Kohm
27p 10uF HS_MIC_N
2.2Kohm
27p HS_MIC_P
100nH
27p
100nH
Copyright © 2008 LG Electronics. Inc. All right reserved.
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24p
HSO_L
HEADSET
100nH
24p
HSO_R
100nH
SPK
SPK_P
47p VARISTOR
SPK_N
47p VARISTOR
MIC_N
MIC
MIC_P
1uF
24p
HS_MIC
100nH
EAR_N
RCV
EAR_P
Only for training and service purposes