Samsung UE40ES7000U E-Manual page 207

Network Settings
Unable to connect to wireless router.
●
Try the following: check if the router
is turned on, and if it is, try turning it
off and on again. Check if you need to
enter a security key to use the router.
IP auto setting failed.
●
Try the following to set your IP address
automatically or set your IP address
manually by selecting
1) Ensure that DHCP server is enabled
to select your router.
'IP Settings'.