Speaker & Receiver Trouble - LG 410G Service Manual

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