Samsung LN19D450G1DXZA - Manual (Page 54)

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Depending on how your network is configured, you may be able to attach
your TV to your LAN by connecting the LAN port on the back of your TV
directly to a network wall outlet using a LAN cable. See the diagram below.
Note that the wall outlet is attached to a modem or router elsewhere in your
house.
The LAN Port on the Wall
TV Rear Panel
LAN Cable