LG 410G Service Manual page 28

Earphone : The earphone amplifier provides a full differential signal on the terminals (EAR_P ,EAR_N)
Headset : Each output amplifier provides a single signal on Headset Left.(HSOL)
Handfree : The 8 Ohms speaker amplifier provides a differential signal on the terminals SPKPA, and
SPKNA then goes to external AMP for SPEAKER(SPKPA,SPKNA)
MICIN
MICIP
HSMIC
MICBIAS
HSMICBIAS
AUXI_FMR
FML
EARN
EARP
HSOL
HSOR
HSOVMID
AUDVMID
FILTERAPLL
SPKPA_1
SPKPA_2
SPKNA_1
SPKNA_2
SPKPD_1
SPKPD_2
SPKND_1
SPKND_2
SPKVDD_1
SPKVDD_2
SPKGND_2
SPKGND_1
TMS
TDO
TDI
TCK
TESTRESET
R202
SPKNA
4.7
C206
47p
R208
SPKPA
4.7
C214 C215
47p 47p
AUXI_FMR
C2
FML
L100
H2
EARN
L101
J2
EARP
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Only for training and service purposes
F2
MICIN
G2
MICIP
D2
HSMIC
G6
H6
C1
RADIO_R
C2
RADIO_L
L100 100nH
H2
L101 100nH
J2
L102 100nH
G1
F1 TP102
J6
E1
P2
K6
L6
SPKPA
M6
M7
SPKNA
K1
K2
M1
M2
L1
L2
N1
H1
R1
U2
U1
T1
K12
B17
Figure 3-10-2 Downlink Interface of ABB
C204 220n R203 5.1K C3
C205 220n R204 5.1K
C2
B1
SPK_EN
C1
C208
R210
100K
1u
RADIO_R
RADIO_L
100nH
100nH
Figure 3-10-3 Speaker/Receiver Interface
-25-
MICBIAS
R112 0
R113 0
R118
15K C115 C116 C117
C114
47p
47p 47p 47n
VBAT
C121 C122
0.1u 4.7u
C200 DNI
VBAT
R200 20K
C201 DNI
R201 20K FB200
U200 TPA6205A1ZQVR
A3
IN- VDD
B3
IN+ VO+
C207
A1
_SHUTDOWN VO-
B2
BYPASS GND
C216 C209
0.1u 2.2u
- 29 -
3. H/W Circuit Description
EAR_P
EAR_N
HSOL
C118 C119 C120
4.7n 4.7u 4.7u
R205 0
47p
R209 0
C210 C211 C212 C213
47p 47p DNI DNI
R112 0
EAR_P
R113 0
EAR_N
LGE Internal Use Only
SPK_P
SPK_N