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LG KG800 Service Manual page 86
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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CIRCUIT DIAGRAM
2V8_VEXT
U402
MAX4764EBC+T
A1
A4
USC4
NO1
IN1
C1
C4
USC5
NO2
IN2
B1
VCC
A2
COM1
B4
C2
C336
GND
COM2
B2
A3
1u
EP1
NC1
B3
C3
EP2
NC2
C313
220u
HEADSET_SPK_L
C314
220u
HEADSET_SPK_R
ICVE10094E300FR
R320
DSR
JACK_DETECT
RPWRON
RPWRON
DBUGTX
VUSBIN
DEBUG_TX
DEBUG_RX
DBUGRX
VUSBIN
C331
1u
C4
C2
MULTI_USB+
NO1
IN1
A4
A2
MULTI_USB-
NO2
IN2
C1
C3
USB+
NC1
COM1
A1
A3
USB-
NC2
COM2
MAX4717EBC-T
2V8_VEXT
U307
HEADSET_EN
VIN
VOUT
C3
GND
C339
BYPASS
VEN
C338
A3
0.01u
1u
LP3985IBLX-2.8
AUXIN
FL300
INOUT_B4
INOUT_A4
6
4
INOUT_B3
INOUT_A3
7
3
INOUT_B2
INOUT_A2
AUXIP
8
2
INOUT_B1
INOUT_A1
9
1
ICVE10094E300FR
FL302
10K
INOUT_B4
INOUT_A4
6
4
C341
INOUT_B3
INOUT_A3
7
3
1u
INOUT_B2
INOUT_A2
8
2
INOUT_B1
INOUT_A1
9
1
FL301
ICVE10094E300FR
USC0
INOUT_B4
INOUT_A4
6
4
INOUT_B3
INOUT_A3
7
3
INOUT_B2
INOUT_A2
8
2
INOUT_B1
INOUT_A1
9
1
EAR_REM_INT
USC1
EAR_REM_ADC
VUSBIN
USB_PATH_SEL
U303
STF203-22-TCT
6
1
D+IC
D+
5
2
VBUS
GND
4
3
D-IC
D-
U302
- 87 -
4. TROUBLESHOOTING
2V8_VEXT
2V6_JACK
C1
JACK_LDO_EN
B2
R315
4.7K
JACK_LDO_EN
A1
C340
1u
2V6_JACK
R302
1K
C302
R304
1.5K
EAR_MIC
R308
100
0.1u
C305
C306
22u
39p
R309
100
C308
C309
C337
39p
27p
47n
EAR_MIC
2V8_VMEM
VA300
PG05DBTFC
C318
U301
MAX4701ETE+T
1u
1
16
NC1
COM1
2
15
IN1_IN2
NO1
3
14
NO2
V+
4
13
COM2
NC4
5
12
NC2
COM4
6
11
GND
NO4
7
10
NO3
IN3_IN4
8
9
COM3
NC3
17
PGND
2V8_VEXT
U308
DG3000DB
B1
A1
IN
NO
EAR_MIC
R303
B2
A2
V+
COM
HOOK_DETECT
1K
B3
A3
C342
GND
NC
C303
1u
0.1u
VCHARGE
2V8_VEXT
VBAT
R306
30K
CHG_DET
R310
30K
R316
R317
100K
100K
CN300
21
19
1
R319
2
NA
3
3 : USC0
4
4 : USC4
5
5 : USC5
6
6 : USC2
7
7 : USC1
8
9
10
11
12
13
14
14 : DSR
15
16
17
18
20
VA301
22
PG05DBTFC
C320
C321
USC2
C319
10u
1u
1u
2012
USB_EN
U301
USB_EN(IN3_4)
Jack_Det(IN1_2)
State
0
1
USC
1
D/C
USB
0
0
Jack_ADC
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