Only recently has Roku started selling TVs with Roku capabilities built in. These are referred to as "Roku Branded TVs", sold through Best Buy. The initial models are "Roku TV Select" and "Roku TV Plus".
Other than that, a number of TV manufacturers have licensed Roku technology for inclusion in some set models and market them as "Roku TVs" (note not "Roku Branded TVs"). Roku doesn't manufacture "Roku TV" sets or their remotes, it only supplies the Roku operating system. Hardware issues with these sets need to be referred to the manufacturer of the set.
oNN sets are manufactured to Wal-Mart specs and are sold by Wal-Mart.
oNN Product Support:
http://onntvsupport.com/#product_support-2
1-844-334-2355