LG KG800 - Page 86

4. TROUBLESHOOTING
- 87 -
CIRCUIT DIAGRAM
6 : USC2
3 : USC0
4 : USC4
USB
0
2012
Jack_Det(IN1_2)
USC
1
USB_EN(IN3_4)
0
State
Jack_ADC
0
1
7 : USC1
14 : DSR
5 : USC5
D/C
U301
1u
C338
C340
1u
LP3985IBLX-2.8
BYPASS
A3
B2
GND
VEN
A1
VIN
C3
VOUT
C1
2V6_JACK
U307
5
G1
10
G2
1
INOUT_A1
INOUT_A2
2
3
INOUT_A3
INOUT_A4
4
INOUT_B1
9
8
INOUT_B2
7
INOUT_B3
6
INOUT_B4
ICVE10094E300FR
FL302
C314 220u
C321
1u
C320
VBAT
VUSBIN
1u
3
4
5
6
7
8
9
1
10
11
12
13
14
15
16
17
18
19
2
20
21
22
CN300
27p
C309
C336
1u
C337
47n
0.1u
C303
C339
0.01u
COM
A2
B3
GND
B1
IN
A3
NC
NO
A1
V+
B2
DG3000DBU308
3
D-
4
D-IC
GND
25
VBUS
STF203-22-TCTU303
D+
16
D+IC
PG05DBTFC
VA301
C308
39p
10K
R313
G1
5
G2
10
INOUT_A1
1
2
INOUT_A2
INOUT_A3
3
INOUT_A4
4
9
INOUT_B1
INOUT_B2
8
INOUT_B3
7
INOUT_B4
6
2V8_VEXT
FL301
ICVE10094E300FR
1u
4.7K
C341
B3
EP2
B4
GND
A4
IN1
IN2
C4
A3
NC1
NC2
C3
A1
NO1
C1
NO2
VCC
B1
R315
MAX4764EBC+TU402
A2
COM1
COM2
C2
EP1
B2
C313
2V8_VEXT 2V8_VEXT
220u
0.1u
C302
1K
R303
MAX4717EBC-T
COM1
C3
A3
COM2
GND
B1
IN1
C2
IN2
A2
NC1
C1
NC2
A1
NO1
C4
NO2
A4
V+
B4
U302
2V6_JACK
1u
C331
VUSBIN
NO3
7
NO4
11
17
PGND
V+
14
16
COM1
COM2
4
8
COM3
COM4
12
GND
6
2
IN1_IN2
IN3_IN4
10
1
NC1
NC2
5
NC3
9
13
NC4
15
NO1
3
NO2
MAX4701ETE+TU301
3.6K
R318
1u
C342
2V8_VMEM
100K
R317
DBUGTX
2V8_VEXT
PG05DBTFC
30K
R310
VA300
C305
22u
2V8_VEXT
R316
100K
DBUGRX
RPWRON
NA
R319
R304
100
100
R309
R306
30K
C318
1u
9
INOUT_B2
8
INOUT_B3
7
INOUT_B4
6
ICVE10094E300FR
G1
5
G2
10
INOUT_A1
1
2
INOUT_A2
INOUT_A3
3
4
INOUT_A4
INOUT_B1
FL300
10u
C319
C306
39p
10KR320
VCHARGE
1.5K
R308
R302
1K
EAR_MICJACK_LDO_EN
HOOK_DETECT
EAR_MIC
EAR_MIC
USB_EN
HEADSET_SPK_L
HEADSET_SPK_R
EAR_REM_INT
USC1
EAR_REM_ADC
DEBUG_TX
JACK_DETECT
MULTI_USB-
MULTI_USB+
USB-
USB+
USB_PATH_SEL
VUSBIN
RPWRON
DSR
DEBUG_RX
JACK_LDO_EN
HEADSET_EN
USC5
USC4
USC2
USC0
CHG_DET
AUXIN
AUXIP