How to Use an HDMI Dongle: Choose a Streaming Device

Updated 9 November 2026 · Standard formula, shown below

An HDMI dongle lets you stream apps on a TV or display, or send video from a phone or computer to a larger screen. Choose a streaming device if you want apps on the TV; choose a video adapter if you want to mirror or extend a device’s screen. Before you start, check the display’s HDMI input and the source device’s compatibility.

What You’ll Need

A TV or monitor with an available HDMI input.
An HDMI streaming dongle, or an adapter that matches your phone, tablet, or computer’s video output. These are different kinds of devices: adapters may require USB-C, Lightning, or another supported port.
A power outlet or suitable USB power source if the dongle requires one. Use its supplied power cable when available.
For a streaming device, a Wi-Fi connection and any necessary app account. Some services require sign-in.
A remote for a streaming dongle, if included, or the compatible phone or computer you plan to use as the source.

Step-by-Step

Decide what you want to do. Pick a streaming device to run video apps directly on the TV, without keeping a phone or computer connected. Pick a video adapter to show content from a compatible phone, tablet, or computer on the display. An adapter does not automatically add streaming apps to a TV.
Check your ports and compatibility. Locate an HDMI input on the TV or monitor and note its label, such as HDMI 1. For an adapter, identify the source device’s connector and confirm that it supports video output. A USB-C-shaped port alone does not guarantee video output; check the device’s specifications. Also verify that the adapter supports the display resolution and refresh rate you want.
Check power and connection requirements. Read the device’s setup instructions. A streaming dongle may need a separate power connection even when plugged into HDMI. A phone adapter may also need power passthrough, especially during extended use. If you plan to watch protected streaming content through an adapter, check that the source, adapter, app, and display support the required video protection; otherwise, playback may be blocked or limited.
Connect the dongle or adapter. With the TV on or off, plug the device into an available HDMI port. If the dongle is too wide to fit beside other cables, use a compatible HDMI extension cable. Connect the power lead as directed, then plug it into a suitable power source. Do not force a connector into a port.
Select the correct TV input. Turn on the display and use its Input, Source, or similar button to select the HDMI port where you connected the device. If you are unsure which port it is, check the label beside the socket or switch inputs until the device’s setup screen appears.
Set up a streaming device. Follow the on-screen prompts to pair the remote if necessary, choose a language, connect to Wi-Fi, and install available updates. Sign in to the streaming apps you use. Keep the dongle powered during updates, and do not unplug it until setup says it is ready.
Connect a phone, tablet, or computer adapter. Attach the adapter to the source device and unlock it. Some phones mirror automatically; others require you to choose a screen-mirroring or external-display option. On a computer, open display settings and choose whether to duplicate the screen or extend the desktop. The exact setting name varies by operating system and device.
Check picture and sound. Start a video or display a test screen. Make sure the picture fits the display and audio comes from the intended speakers. If needed, adjust the TV’s picture size and the source device’s display resolution or audio output. Disconnect by removing the adapter from the source device or safely turning off the streaming device according to its instructions.

Common Mistakes

Confusing a streaming dongle with an adapter: A streaming device runs apps itself; an adapter carries a signal from another device. Choose based on where you want playback to come from.
Assuming every USB-C port outputs video: Some ports support charging and data but not display output. Confirm video compatibility before buying an adapter.
Using the wrong HDMI input: The TV must be set to the same port number the dongle uses.
Skipping external power: A device may fit into HDMI but still need power. A TV’s USB port may not provide enough power for every dongle.
Expecting an adapter to fix unsupported content: App restrictions, protected-video requirements, or incompatible devices can prevent playback even when the connection appears correct.
Forcing a plug or using an unsuitable adapter: Match connector types and supported video standards; forcing a connector can damage the port.

Tips

Before purchasing, check both the source device’s video-output support and the display’s available inputs.
For a TV mounted close to a wall, an HDMI extension can reduce strain on the dongle and make it easier to access.
Use a stable Wi-Fi connection for streaming. If playback buffers, move the router closer or reduce competing network use where practical.
For presentations, test the adapter, display, sound, and any needed sign-in before the meeting.
Keep the dongle’s ventilation area clear. Small devices can become warm during use; avoid covering them with fabric or placing them where heat cannot escape.
If the display is a monitor rather than a TV, check whether it has speakers. Some monitors have no speakers, so you may need separate audio equipment.

Troubleshooting

The TV says “No signal.” Confirm the dongle is fully inserted, powered, and connected to the selected HDMI input. Try another HDMI port and select that input. Restart the source device or streaming dongle, then check the cable and power connection.

The screen is blank or flickers. Disconnect and reconnect the adapter, and check that the source supports video output. If possible, test another HDMI cable or display. Set the source to a resolution and refresh rate supported by the screen; a setting that is too high can prevent a picture.

There is no sound. Check the TV’s volume and mute setting, then select the display or HDMI device as the audio output on the phone or computer. Confirm that the display has speakers or that external speakers are connected. A video adapter may carry audio only when the source and adapter support it.

The streaming device will not connect to Wi-Fi. Re-enter the network password, check that other devices can reach the internet, and restart the router and dongle. Follow the device’s instructions for network compatibility; some devices may not support certain network bands or sign-in pages.

Video apps show a black screen or refuse playback through an adapter. Check whether the app allows external display playback and whether the source, adapter, and display support protected video. Try the app directly on a streaming device instead, or consult the device maker’s compatibility information.

The adapter disconnects or the phone battery drains quickly. Check the fit of the connector and use the adapter’s power input if it has one. Avoid pulling or twisting the cable, and try a compatible power supply if the instructions call for one.

Frequently Asked Questions

Can an HDMI dongle work on any TV?
It can work with a display that has a compatible HDMI input, but setup, power, resolution, and app requirements vary. Older displays may not support every video format.

Do I need Wi-Fi to use an HDMI adapter?
Not for basic screen mirroring from a compatible device. You do need internet for online streaming apps, and some wireless casting methods also require a network connection.

Can I use a phone’s charging adapter to connect it to HDMI?
Only if the phone supports video output through that port and the adapter is compatible. Charging capability alone does not mean the phone can send video.

Will a streaming dongle work without a remote?
Some models can be controlled with a compatible phone app or another supported method, but setup may require the included remote. Check the device instructions before relying on a phone.

Why does the picture show but not fill the screen?
Check the TV’s picture-size or aspect-ratio setting and the source device’s resolution. Choose a display mode supported by both devices rather than stretching the image.

Can I connect the dongle through an HDMI splitter?
Possibly, but splitters can cause compatibility or protected-content problems. Test a direct connection first and use a splitter that supports the devices’ video and audio requirements.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.