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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.13 Headphone Trouble
Check Points
-18pin IO connector
-Passive Parts slodering Status
TEST POINT
CIRCUIT DIAGRAM
9,10 : BATT
FOR RADIO
5 : EAR_R
4 : EAR_L
I/O CONNECTOR
1608
7 : RXD
12,13 : CHG
8 : JACK_D
2 : AUDIO
FOR RADIO
6 : TXD
(25V, X5R, 1608)
11 : R/ON
EAR_MIC
(1608)
FOR RADIO
C307
39p
10p
1800
FB302
10u
C305
C308
C317
39p
0.1u
C301
FB301
1800
DNI
R316
100K
R306
1800
FB303
R305
100K
C302
NA
R304
100K
2V8_VIO
2V8_VIO
C316
18p
L301
270nH
VBAT
C314
1u
C313
56p
R301
1.5K
2V8_VIO
2V8_VIO
R302
2.2K
VCHARGE
C309
10u
FB304
NA
R303
FB307
FB309
FB308
39p
C310
FB306
C315
4.7u
C311
39p
VBAT
C304
0.1u
VMIC
21
22
3
4
5
6
7
8
9
GU041-18P-E1000
1
10
11
12
13
14
15
16
17
18
19
2
20
CN301
10u
FM_ANT
DSR
C303
AUXOP_FML
RXD
TXD
AUXOP_FMR
RPWRON
HS_MIC_P
HS_DET
HS_MIC_N
FB302
FB301
C308 C309
CN301
FB303
U201
R301
TP1
TP6
TP5
TP2
TP3
TP4
TP5
FOR RADIO
FOR RADIO
DNI
R202
R209
240K
2V8_VIO
DG2735DN-T1-E3
U201
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
V+
2V8_VIO
DNI
R205
330K
R203
100K
R210
0.1u
C201
HS_REC
HEADSET_RADIO_SEL
AUXOP_FMR
AUXOP_FML
HS_REC
RADIO_SPK_R
RADIO_SPK_L
TP2
TP5
TP1
TP4
TP3
TP7
TP6