Linking multiple TVs together is possible using a variety of different approaches. The type of link created depends largely on the display preference. The two televisions can link to a common cable box or media source to play the same picture or they can link to create one large picture.
Sync TVs Together: Single Source
Linking to a single source is not uncommon and it will display the same content on both TVs. You might have a single wall with a television on either side, perhaps one in the living room and the other in a bedroom. Linking them to a single media source reduces the need for additional cable boxes. The only downside to this system is the inability to play different channels and media at the same time on either television.
Gamers also use multiple linked screens. Competition gaming often places multiple users in the same room and multiple screens with the same display are used to set up side by side playing stations. The televisions will link from a single source and players can focus on their own screen while playing in adjacent physical positions.
Making the Connections
If casting the same content through both televisions is desired, go ahead and set up HDMI cables from each television with enough length to reach the common box or media source. Plug an HDMI splitter into the media box to create two ports rather than one. Plug each HDMI cable into the splitter and test both televisions simultaneously to ensure everything functions properly.
Both television sets should show the same content and function in the same manner. If the televisions are matching models, they will display normally. Making adjustments to the screen settings on each television will only affect that specific display. This means you can change one TV to display a wide angle and another to fit the screen and they will act independently of each other in that display.
Chromecast Television Link
A Chromecast, Roku or other modern media device functions differently than a traditional cable box. They do not require an HDMI cable hookup and the device often plugs directly into a USB port or casts across a wireless connection. Casting to multiple televisions from a single device is possible using a specialized process. In some cases, casting different media simultaneously is also possible using a single device.
For Chromecast specifically, install the Chromecast Extension and locate the two boxes in the top right corner of the control panel. These represent the two television screens linked to the Chromecast. Open the webpage or streaming app you want to cast across the screen. Next, select the television where the content will cast and it will appear on the television.
To cast different content to the second television screen, open a new tab, browser or app. Navigate to the desired content and select the second television from the top right corner to cast the content. Now the Chromecast is playing different streams on multiple linked televisions.
TV Board Link
You can use a TV board setup to link two television sets to create one enlarged picture. You can actually link a larger number of TVs to create one very large picture as well. This is often used for events that require a large picture in a stadium style setting. The combinations are all done in even numbers with two, four, six, eight or more screens being linked at a time.
There are essentially two methods of linking the televisions together. The first is a daisy chain style connection that links the two televisions through a direct HDMI connection. The internal television settings are used to create a 2x2 linked screen view. The exact process for this varies based on the brand and year of the actual televisions.
The second method uses a video wall controller box to sync TVs together. Set the controller to a 2x2 setting and plug your cable box or media source into the controller. Now the linked screens will display a single image, acting as one enlarged screen.