There is ADHD (Attention Deficit Hyperactivity Disorder) and HD TV (high-definition television), but ADHD TV? “Inventing: ADHD TV - has a high definition picture & changes channels automatically every 5 seconds. Could be a big seller” was posted on Twitter on November 26, 2007. “The shows on this channel are all like 5 minutes long. It’s ADHD TV” was posted on Twitter on March 23, 2009.
 
“Just got one of those ADHD TV’s, the picture’s great but you have to change channel every ten seconds” was posted on Twitter by Gary Delaney on May 9, 2010. “I bought a new ADHD TV today. It changes channel by itself every 30 seconds” was posted on Twitter by Sickipedia_Feed‏ on August 25, 2012.
 
     
Wikipedia: Attention deficit hyperactivity disorder
Attention deficit hyperactivity disorder (ADHD) is a mental disorder of the neurodevelopmental type. It is characterized by problems paying attention, excessive activity, or difficulty controlling behavior which is not appropriate for a person’s age. The symptoms appear before a person is twelve years old, are present for more than six months, and cause problems in at least two settings (such as school, home, or recreational activities). In children, problems paying attention may result in poor school performance.[1] Although it causes impairment, particularly in modern society, many children with ADHD have a good attention span for tasks they find interesting.
 
Wikipedia: High-definition video
High-definition video is video of higher resolution and quality than standard-definition. While there is no standardized meaning for high-definition, generally any video image with considerably more than 480 vertical lines (North America) or 576 vertical lines (Europe) is considered high-definition. 480 scan lines is generally the minimum even though the majority of systems greatly exceed that. Images of standard resolution captured at rates faster than normal (60 frames/second North America, 50 fps Europe), by a high-speed camera may be considered high-definition in some contexts. Some television series shot on high-definition video are made to look as if they have been shot on film, a technique which is often known as filmizing.
         
Twitter
Brian Bella‏
@linksmonkey
Inventing: ADHD TV - has a high definition picture & changes channels automatically every 5 seconds. Could be a big seller.
11:19 PM - 26 Nov 2007
       
Twitter
Topher Payne‏
@topherpayne
the shows on this channel are all like 5 minutes long. It’s ADHD TV.
12:12 AM - 23 Mar 2009
 
Twitter
Gary Delaney‏
@GaryDelaney
Just got one of those ADHD TV’s, the picture’s great but you have to change channel every ten seconds.
10:02 AM - 9 May 2010
 
29 May 2010, Sydney (Australia) Morning Herald, “We like to watch but it’s more fun when you’re a team: The Tribal Mind” by David Dale, pg. 15:
AUSTRALIANS are famous as early adopters, which is why the social analyst Akmal Saleh knew he’d be instantly understood when he discussed his search for the latest in entertainment gadgetry recently. Having invested in the likes of digital TV, TIVO, 3D TV and HD TV, he was eager to upgrade to the Next Big Thing - ADHD TV, which automatically changes channel every 30 seconds.
   
Twitter 
Jake Smith‏
@JakioSmith
Just got one of those ADHD TVs. The picture’s great but you have to change channel every ten seconds #5kgag
3:23 PM - 4 Jun 2010
 
Twitter
David Zunker‏
@Isispriest
My 13yr old lad’s joke: They have invented a new type of TV; the ADHD TV. It changes channels every 5 seconds.
3:08 PM - 31 Aug 2010
 
Twitter
SipsyJP‏
@SipsyJP
RT @Jason_Manford I’m terrible for channel hopping, flick through 20 channels a min, but it’s not my fault, we’ve got one of those ADHD TVs.
1:36 AM - 24 Sep 2010
     
Twitter
Amanda 🌙‏
@amandvh
Omg. RT @Mattkean: The TV in my bunk keeps changing channels randomly I think its one of those new adHD tv’s
11:30 PM - 18 Oct 2010
   
Twitter
Julian Mount‏
@JulianTJuggler
My new ADHD TV keeps changing channels.  #circusunlimited
11:00 AM - 12 Jan 2011
   
Twitter
Alan Machnik‏
@Alan_Machnik
I have a 3D OCD ADHD TV. Great picture, all the channels are in order, but they change every 30 seconds.
4:07 PM - 17 Feb 2011
   
Twitter
Jordan‏
@jtbrash
Just got one of those new ADHD tv’s. Picture is great but it keeps changing channels randomly
7:08 PM - 13 Dec 2011
     
Twitter
👉 😎 👉‏
@roxxycleopatra
Tv keeps flicking through a million channels by itself, so restless. ADHD TV? #wehey
10:05 AM - 15 Dec 2011
 
Twitter
Sickipedia_Feed‏
@Sickipedia_Feed
I bought a new ADHD TV today. It changes channel by itself every 30 seconds (via Akmal Saleh) http://bit.ly/Oe64hN
8:04 PM - 25 Aug 2012
 
Reddit—Dad Jokes
What kind of TV changes channels by itself? (self.dadjokes)
submitted February 20, 2015 by usernameicanremember
An ADHD TV
 
Twitter
Tom King, of comedy.‏
@ItsTomKing
My TV keeps changing the channels by itself every few seconds. It’s an ADHD TV.
4:26 PM - 19 May 2017
 
Twitter
Dave Rose‏
@davetwojackets
My new telly doesn’t stay on the same channel for very long.  It’s an ADHD TV #1pun
6:59 AM - 18 Jan 2018