LG KE520 Service Manual page 142

7. CIRCUIT DIAGRAM
47K 47K
R300 R301
1
C301 NC1 GND3
2
U302
FM_ANT FMIP LOUT
3
100p RFGND ROUT
SI4703-B16-GM
4 1
C304
GND1 GND2
5
NA
_RST VD
R308
10K
ANALOG SWITCH
VBAT
(UART3 <=> Bluetooth)
U305 MAX4701ETE+T
1 16
UART_RXD NC1 COM1 UART3_RX
2 15
BT_NRST IN1_IN2 NO1 BT_RX
3 14
BT_TX NO2 V+
4 13
UART3_TX COM2 NC4
5 12
UART_TXD NC2 COM4 UART3_RTS
6 11
GND NO4 BT_RTS
7 10
BT_CTS NO3 IN3_IN4 BT_NRST
8 9
UART3_CTS COM3 NC3
17
PGND
BOOT SELECT
VRIO
USB_BOOT_SEL
3
R321
Q301
2
VBUS
KTC4075E
20K
1
VRIO
R325
10K
BOOT_SEL
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VRABB
VRIO
VRIO
LMV7291MGX-NOPB U301
5
1 VCC
HOOK_DETECT
OUT
GND
15 2
C302 0.1u
14
RADIO_L
13
RADIO_R
C303 0.1u
2
11
VRIO
C306 C307
1u 1u
C308
0.1u
U303
VCC
TC7SH04FS
5
C311
4 1 C312 0.1u
CLK_32K
0.1u 2
C315
GND R310
27p
47K
OVP
VBAT VBUS_IN
U304 NCP348MTR2G
1 10
IN1 _EN
4 9
IN2 GATE_OUT
5 8 VBUS
IN3 GATE
3 7
_FLAG OUT2
2 6
GND OUT1
11
NC1
12
NC2
R322
BATT_TEMPS BATT_TEMP
20K
33K
C320
R324 47p
VRIO
0.1u
U300
C300
DG2011DX-T1-E3
6 2
NO V+
R302
4 1
NC IN HOOK_EN
1K
5 3
4 VIN-
COM GND
3 VIN+
C305
120p
R306
200
HSOL
HSOR
R307
HSMICBIAS
200
R309
C309 C310
3.9K
47p 2.2u
C313
0.1u
HSMICIP
C316
120p
JACK_TYPE
JACK_DETECT
RPWON
VBAT
UART3_DSR
ANALOG SWITCH
VBUS_IN
VRIO
(UART3 <=> Remote control))
0.1u
C317
UART_TXD
UART_RXD
U306
DG2018DN_T1_E4
1 12
REMOTE_INT NC1 COM4
2 11
IN1_2 NO4
3 10
NO2 IN3_4
4 9
COM2 NC3
REMOTE_ADC
R316 20K
TR_USB_DP
TR_USB_DM
- 143 -
18Pin IO Connector
VRIO VBAT VCHG
FM_ANT
C314
L300
27p
100nH
VA300
EVLC5S0250
CN300
R311
21
19
47
1
2
3
4
5
6
7
8
9
10
11
FB302
12
FB303 13
14
C318
4.7u 15
C319
16
4.7u UART2_TX
17
UART2_RX
18
20
22
VBAT
FB304 FB305
Q300
OUT C
10K
RN1307 B
VBUS
IN
R318
GND E
KE520
LGE Internal Use Only