How to Use Your TV as a Second Monitor for Your Computer

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Improve your computer set up by connecting a TV
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If you want to use a TV as a bigger second monitor for your computer, you'll just need the proper cables. Once you've connected your Windows or Mac computer to your TV via the appropriate cable, you can change how your computer's display appears on your TV from within your computer's display settings. With newer computers and TVs, you can extend your monitor wirelessly using a built-in utility like AirPlay (Mac) or Miracast (Windows). This wikiHow teaches you how to use your TV as a second monitor for your Windows or Mac computer.

Using a TV with a Computer

Connect your computer to your TV with the appropriate cable. You might need an adapter. Turn on the TV and switch it to the correct input. On your computer, set the Display to "Extending" to use it as your second monitor. You can also connect wirelessly with Miracast (PC) or AirPlay (Mac).

Section 1 of 5:

Connecting Your Computer to the TV

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  1. Virtually all computers have at least one video output port:
    • Windows
      • HDMI - A six-sided, tapered port. Transmits both audio and video.
      • DisplayPort - Similar to a USB port, but with one crimped corner. Transmits both audio and video.
      • VGA - A blue trapezoid with holes in it. VGA transmits video, but you will need a separate audio cable (such as A/V cables ) to transmit sound.
    • Mac
      • HDMI - Found most often on Macs manufactured between 2012 and 2016. Also found on the backs of iMac computers. [1]
      • Thunderbolt 3 (also known as "USB-C") - Found on the sides of modern MacBooks and the backs of iMacs. You can't connect a USB-C cable directly to a TV, but you can buy a USB-C to HDMI adapter. [2]
  2. You'll usually find the video input section on the side or back of the TV. Nearly all modern TVs have HDMI ports; if your TV has an HDMI port, try to prioritize it. [3]
    • Other common input ports include DVI, VGA, and A/V inputs.
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  3. If both your computer and your TV have the same port type (e.g., HDMI), you do not need an adapter; otherwise, you'll need a [computer port] to [TV port] cable or adapter (e.g., USB-C to HDMI).
  4. You can usually pick up cables and adapters in tech stores such as Best Buy, as well as online in places like Amazon and eBay . [4]
  5. The cable should plug into your computer's video output port.
    • If you bought an adapter to bridge the gap between two separate cables, you'll instead plug the computer's cable into one end of the adapter, attach the other end of the adapter to the other cable, and plug the other cable into the TV.
  7. If you are connecting your computer to your TV using HDMI-to-HDMI or DisplayPort-to-HDMI, you don't need any extra cables to send audio to the TV. If you're using a different connection, including something like VGA-to-HDMI, you'll need to use a separate audio cable to send audio from your computer to your TV.
    • Use a standard 3.5mm stereo cable to connect the Audio Out port on your computer to the Audio In port that matches the input you're connected to on the TV. The Audio Out port on your computer is usually green, and may have a symbol indicating that it is sending the signal out.
  8. Press the TV's Power button to do so.
  9. Use your TV's remote to turn it on and switch to the input that you connected your computer to. The input in question will usually have a label, such as "HDMI 1" or "1".
    • You can also use the Input or Video button on your TV to cycle through the available inputs.
  10. Once you see your computer's screen appear on the TV, you can proceed with changing your display settings to set up your TV's screen as you like.
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Section 2 of 5:

Changing Display Settings on Windows

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  1. Click the Windows logo in the bottom-left corner of the screen. The Start menu will open. [5]
  2. Click the gear-shaped icon in the lower-left side of the menu. [6]
  3. It's a computer-shaped icon in the Settings window.
  4. This option is on the left side of the Display window.
  5. This is the box at the top with the display arrangements .
    • If you're using Windows 10 or earlier, scroll down to the Multiple displays section and click the drop-down menu.
  6. It's an option in the drop-down box. This will ensure that your TV's screen acts as a continuation of your PC's screen (rather than just duplicating it).
  7. Moving your mouse all the way to the right edge of your computer will move the mouse onto your TV's screen, where you can proceed to use the computer like usual.
    • Any content on your computer's screen will remain as it was before extending the display.
    • Think of the TV as a screen immediately to the right of your computer's screen.
    • You can also change the screen resolution .
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Section 3 of 5:

Changing Display Settings on Mac

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  1. Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear.
  2. It's near the top of the drop-down menu. [7]
    • On older devices, this will be System Preferences .
  3. This is the computer monitor-shaped icon. [8]
  4. It's in the upper-left corner of the window. [9]
  5. Check the "Scaled" box, then click a resolution .
    • You can't use a resolution that's higher than your TV's built-in resolution (e.g., 4K).
  6. Click and drag the "Underscan" slider that's at the bottom of the page left to show more of your Mac's screen on the TV or right to zoom in the screen.
    • This will help you fit your Mac's screen to your TV if the image on the TV is too large or too small.
  7. You'll find this option at the top of the window.
  8. This will prevent the TV from merely duplicating what you see on your Mac.
    • Skip this step if the box is unchecked.
  9. The TV's screen icon, which is usually the larger rectangle at the top of the window, should be to the right of your Mac's screen icon. You can click and drag the TV's icon to the right if necessary.
    • The screen icon with the white bar at the top of it is your Mac's screen.
  10. Moving your mouse all the way to the right edge of your computer will move the mouse onto your TV's screen, where you can proceed to use the computer like usual.
    • Any content on your computer's screen will remain as it was before extending the display.
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Section 4 of 5:

Using Miracast (Windows)

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  1. If your TV and PC are both Miracast compatible, you can easily connect them wirelessly. For some TVs, you may need to plug in a Miracast dongle . [10]
  2. A menu with a list of available devices will open.
  3. If you don’t see your TV, make sure it’s turned on and either Miracast compatible or connected to a Miracast dongle adapter. Both devices need to have Wi-Fi enabled, but you don’t have to be connected to the same network.
  4. You will be guided through the process of connecting your computer to your TV screen.
  5. In the menu that pops up, you can choose to extend your display across both screens, mirror your PC to your TV, or just show a display on one screen or the other.
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Section 5 of 5:

Using AirPlay (Mac)

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  1. Some Smart TVs have the ability to connect wirelessly via AirPlay. This eliminates the need for wires to project your Mac computer to your TV. This is helpful if you want to stream videos from your Mac onto a bigger screen or wirelessly mirror or extend your entire screen. [11]
    • If you're unsure whether or not your TV has AirPlay, select the Source button on your remote and look for an AirPlay option. You can also look up your TV's manual to confirm.
  2. Since you're using a wireless connection, you must set both your Mac and TV on the same wireless network.
  3. If you want to mirror or extend your entire screen to your TV, here’s how: [12]
    • Click the Control Center icon in the menu bar at the top of your screen.
    • Click Screen Mirroring . This button shows an icon that looks like two overlapping rectangles.
    • Select your TV from the list of available devices.
    • Your TV screen may display a 4-digit code. Enter it on your Mac.
    • Select whether you want to share a single window, mirror your Mac’s entire screen, or extend your monitor onto your TV.
      • You can change your selection by clicking the Screen Mirroring icon in the menu bar at the top of your screen, then selecting Change .
      • Go to Screen Mirroring > Stop to stop mirroring.
  4. On your Mac computer, navigate to the video you want to project. Most streaming websites have an AirPlay feature. To use it:
    • Click the AirPlay icon. This should be somewhere along the playback controls.
    • Select your TV. This should be in the list of options. If you don't see your TV, make sure it's turned on and connected to the same Wi-Fi network. The video will start playing on your TV.
    • Stop streaming. Click the AirPlay icon on your Mac, and then select your Mac to disconnect it from your TV.
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Community Q&A

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  • Question
    Does the VGA cable transmit audio as well as video?
    Community Answer
    VGA cables do not transfer audio. For the best quality image and easy audio transfer, use an HDMI cable. If you have to use VGA, you'll need a separate audio cable.
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  • Question
    Can I use the USB ports on the TV the same way as I would on my computer?
    Community Answer
    Depending on the type of TV you have, you can usually insert a flash drive or external hard drive and use it to view pictures and movies. However, if you want to use it as a second monitor for the a computer, you will have to connect it to your computer with a VGA or HDMI cable and use the controls on your computer. Change your computer display settings to identify the TV as a second monitor and either duplicate or extend the displays. You most likely won't be able to use the TV USB ports as USB connections to your computer.
    Thanks! We're glad this was helpful.
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  • Question
    I want to give a presentation using my laptop and the TV as my monitor. The TV is new and has not been connected to watch television. I have connected the laptop to the TV via the proper cable. What do I have to do so the DVD in my computer shows on the TV?
    Community Answer
    Once you've connected your TV and the screen is showing the extension of your desktop, start the DVD in your laptop's media player, then drag the window onto the TV screen. When you set the video to full-screen, it will fill the TV display. You can also mirror or duplicate your display so that the TV displays exactly what the laptop screen displays.
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      Tips

      • Extended displays are often used for things like gaming and audio-mastering.
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      • Windows users can change the type of screen extension used at any time by pressing ⊞ Win + P to open the "PROJECT" menu.
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      Warnings

      • Not all TVs will respond well to screen extension; older LCD TVs may stutter or display graphical glitches such as screen tearing when moving your mouse between your computer's screen and the TV's screen.
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      References

      1. ↑ https://support.apple.com/en-ph/guide/mac-help/mchlp1206/mac
      2. ↑ https://support.apple.com/en-ph/guide/mac-help/mchlp1206/mac
      3. ↑ https://www.pcworld.com/article/427564/use-your-tv-as-a-computer-monitor-everything-you-need-to-know.html
      4. ↑ https://www.pcworld.com/article/427564/use-your-tv-as-a-computer-monitor-everything-you-need-to-know.html
      5. ↑ https://support.microsoft.com/en-gb/windows/set-up-dual-monitors-on-windows-3d5c15dc-cc63-d850-aeb6-b41778147554
      6. ↑ https://support.microsoft.com/en-gb/windows/set-up-dual-monitors-on-windows-3d5c15dc-cc63-d850-aeb6-b41778147554
      7. ↑ https://support.apple.com/guide/mac-help/connect-an-external-display-mchl7c7ebe08/mac
      8. ↑ https://support.apple.com/en-ph/guide/mac-help/mh40768/mac
      9. ↑ https://support.apple.com/en-ph/guide/mac-help/mh40768/mac
      1. ↑ https://support.microsoft.com/en-us/windows/screen-mirroring-and-projecting-to-your-pc-or-wireless-display-5af9f371-c704-1c7f-8f0d-fa607551d09c
      2. ↑ https://support.apple.com/guide/mac-help/stream-video-and-audio-with-airplay-mchld7e543a0/mac
      3. ↑ https://support.apple.com/en-ie/guide/mac-help/mchld7e543a0/15.0/mac/15.0

      About This Article

      Article Summary X

      To use your TV as a second monitor for your computer, start by finding your computer’s video output port and your TV’s input port to determine what kind of connecting cables or adapters you will need. Once you have the appropriate cables or adapters, connect the cable from your computer’s output port to your TV’s input port, as well as any necessary audio cables. Finally, use your remote control or TV’s “Input” or “Video” button to find the correct input option to see your computer screen appear on your TV. For more tips, like how to change your computer’s display settings, read on!

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