LG KE800 Service Manual page 60

4.18.1 Multi-Port Switch 1
MULTI-PORT SWITCH 1
2V72_IO
R425
10K
Pin6 TXD_0
Pin7 RXD_0
1
NC1
2
JACK_DETECT IN1-2
3
NO2
4
COM2
Pin6 REMOTE_INT
Pin7 REMOTE_ADC
R433 1.5K
USB_PU
R434 22
Pin6 USB_DP
R437 22
Pin7 USB_DM
Control
VBUS_USB JACK_DETECT
Low
High
High
VBAT
VBAT
U405
ISL8499IRZ-T
R429
12
Pin7 COM4 MULTI_PORT_1
11 10K
NO4
10
IN3-4
9
Pin7 NC3
MULTI_PORT_0
C
OUT
Q401
C429
RN1307
0.1u
E
GND
MULTIPORT0
X USB_DP
High TXD
Low REMOTE_INT
- 61 -
R430
B
VBUS_USB
IN
10K
R432
10K
Signal Connection
MULTIPORT1
USB_DM
RXD
REMOTE_ADC
4. Trouble Shooting
FB401
FB405
U405
Application
USB
UART1
Headset