Read LG 47LK550 (CHASSIS:LA12B) Service Manual online
LGE35230
6. USB block
USB1
SIDE_USB_DP
SIDE_USB_DM
+5V_USB
USB_PORT1DP
USB_PORT1DN
USB_PORT1DN
USB PWR
Switch
(IC1204)
USB_PWRFLT_1
USB_PWRON_1
5V
USB2
WIFI_DP
WIFI_DM
+5V_USB
USB_PORT2DP
USB_PORT2DN
USB_PORT2DN
USB PWR
Switch
(IC1203)
+3.3V_Noraml
USB_PWRFLT_2
USB_PWRON_2
5V
+3.3V_Noraml
Click on the first or last page to see other 47LK550 (CHASSIS:LA12B) service manuals if exist.