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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
-48-
4.9 Speaker & Receiver Trouble
TEST POINT
CIRCUIT
Check Points
-Speaker/Receiver Solder contact
-Audio amp soldering
TP4
TP3
TP2
TP1
TP1
(R202),
TP2
(R208) :SPK path
-> Audio signal Check
TP3
(R112),
TP4
(R113) : RCV path
-> Audio signal Check
C210
47p
1u
C208
R205
0
R204
5.1K
20K
R201
4.7
R208
C209
2.2u
C213
DNI
47p
C214
VBAT
47p
C206
DNI
C200
DNI
C201
100K
R210
C215
47p
C216
0.1u
4.7
R202
C212
DNI
R209
0
FB200
C211
47p
47p
C207
A3
B3
VO+
A1
VO-
_SHUTDOWN
B1
U200
TPA6205A1ZQVR
C1
BYPASS
B2
GND
IN+
C2
C3
IN-
VDD
20K
R200
C205
220n
R203
5.1K
220n
C204
SPK_P
SPK_N
SPKNA
SPKPA
SPK_EN
L101
100nH
C2
FML
G1
XI_FMR
EARN
H2
EARP
J2
L100
100nH
0
R113
L102
100nH
R112
0
EAR_N
EAR_P
RADIO_L
RADIO_R
TP1
TP2
TP3
TP4