Earphone Trouble - LG -C300 Service Manual

4. TROUBLE SHOOTING

4.10 Earphone Trouble

4.10 Earphone Trouble
TEST POINT
TEST POINT
C210
C210
U202
U202
C255_TP1
C255_TP1
C256_TP2
C256_TP2
CIRCUIT
CIRCUIT
AUDIO AMP SUB SYSTEM & SIGNAL DISTRIBUTOR
VBAT
C2
IN1-
C1
IN1+
U202
C255 1u
D2
EAR_SPK_N IN2-
1u WM9093ECS-R
C256 D1
EAR_SPK_P
IN2+
EUSY0403901
D3
IN3-
C3
IN3+
C205
I2C_SCL
2.2u
I2C_SDA
LGE Internal Use Only
C209
C209
Figure 4.11.1
C203
C202
10u
0.1u
EAR_GND
DNI
R263
C5
TP2 TP1
OUT+
D5
OUT-
TP2
A2
HPL HP_LOUT
C210
A1
TP2 TP1
HPR
47p
HP_ROUT
TP1
C211 C212
0.1u 0.1u
B5 C218 2.2u
CPVDD
A3 C214 2.2u
R208
CPVSS R201
A4 20
20
CP
A5 C213 2.2u
CN
1V8_VDD
1V8_HPVDD
R238 1800
FB207
DNI
2.2u
C204
C206 0.1u
DNI
EAR_GND
R250
R212
EAR_GND
0
EAR_GND
2. TROUBLE SHOOTING
2. TROUBLE SHOOTING
Figure 4.11.1
TP3
TP3
1V8_VDD
VAUX
TP4
SPK_P
SPK_N
C209
TP4
47p R262
1M
S
1V8_VDD G
Q201
R261
D
R230
DNI 100K
JACK_DETECT
TP
L207
FB205
HP_LOUT 0.1uH
1800
TP4
R266
DNI
L204 FB206
HP_ROUT 0.1uH
1800
C240
C252
270pF
270pF
- 90 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
FB205_TP3
FB206_TP4
L202
0.1uH
R265 R264
DNI DNI
R239
DNI
VA206 VA209 VA210 VA205
C261
C262
DNI DNI
Only for training and service purposes
FB205_TP3
FB206_TP4
C244 47p
L203
FM_ANT
0.1uH
VA211
0
EAR_GND
R251
0
M6
2
M1
3
M4F
4
M3
5
M4
6
M5
1
J201