LG KM710 Service Manual page 112

7. CIRCUIT DIAGRAM
1 2
A
ANALOG SWITCH
U300
1
UART_RXD NC_A1
B 2
BT_NRST SAB
3
BT_TX NO_B0
4
UART3_TX COM_B
R307
100K
USB BOOT SELECT
C
VRIO
R312
100K
3
R313
2
VBUS
20K
1
R314
10K
D
E
1 2
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3 4 5
HSOUTL
HSOUTR
HSMICBIAS
VBAT
HSMICIP
NLAST9431MT
12
COM_D UART3_RTS
11
NO_D0 BT_RTS
10
SCD
9
NC_C1
HOOK_DETECT
LMV7291MGX-NOPB
BT_NRST : 0 = UART, 1 = BT
VRIO
UART_TXD
UART_RXD
JACK_DETECT
USB_BOOT_SEL
Q300
2SC5585
REMOTE_INT
R807
REMOTE_ADC
47K
ABB_USB_P
ABB_USB_N
R806
200K
USB_BOOT_SEL : 0 = UART, 1 = ABB USB(DL)
JACK_DETECT : 0 = REMOCON, 1 = UART
3 4 5
6 7
R300
3K
R301 C300 C301
2.4K
120p 10u
C307
0.1u
L303
C308
100nH
120p
VRIO
VRIO VRIO
U301
R302
1 6
HOOK_EN S B1 R304
220K R305
2 5
VCC GND
1K
U302 5 3 4 100K
4 VIN-
A B0
1 VCC
JACK_DETECT
FSA4157L6X
OUT 3 VIN+
GND
2 VA301
R308
10K LAST CALL
UART3_DSR
VBUS_IN
VBAT
VBAT
R309
100K
C312 R310
0.1u
100K
MM_USB_EN
R311
U304
100K
1 12
NC1 COM4
2 11
IN1_2 NO4
3 10
NO2 IN3_4 USB_BOOT_SEL MM_USB_DM
4 9
COM2 NC3
MM_USB_DP
DG2018DN_T1_E4
C313
0.1u
MM_USB_EN : 0 = ABB/DBB, 1 = MM USB
- 113 -
8 9
C304 C305
27p 27p
10p 270nH
C306 L302
FB300
FM_ANT
CN300
VA300
21
19
EVLC14S02050
VRIO 1
VBAT
2
R303 47 3
JACK_TYPE
FB301
4
VCHG_IN 5
R306
FB302 6
100K 7
FB303
8
9
10
11
EVLC14S02050 PWON
12
FB304
13
FB305 14
15
16
UART2_TX
17
C309 C310 C311 UART2_RX
FB306 18
1u
1u 1u
20
22
FSUSB30UMX U303
10 1
SEL HSD1+
9 2
VCC HSD2+
8 3
_OE D+
7 4
HSD1- GND
6 5
HSD2- D-
ZD300 ZD301
R315
100K
LGE Internal Use Only
10
A
B
C
D