Yes, with compatible equipment—but a splitter’s name alone does not tell you whether it will work. The Steam Deck can send a picture to an external screen and receive charging power through its USB-C connection. To use a wired keyboard or mouse as well, the adapter must handle video, charging, and USB data together.
The important question is where the power comes from. A monitor that can charge the Deck directly may stop doing so when you place an unsuitable adapter between them.
Check your monitor first: you may not need a splitter
Some portable USB-C monitors can charge a connected device when their own charger is plugged in. Check your monitor’s manual for charging a connected device or two-way power. PD output means Power Delivery charging sent to another device. A socket that accepts power to run the screen does not, by itself, establish that the monitor can charge the Deck.
For example, the ViewSonic VG1655 manual describes charging a connected device when the monitor’s power adapter is attached. Use the instructions and power limits for your exact monitor.
- Power the monitor using the charger and connection described in its manual.
- Connect the monitor’s video-capable USB-C port directly to the Steam Deck with a USB-C cable that supports video.
- Check that a picture appears and the Deck receives charging power.
If that works and you use Bluetooth accessories, you may already have the setup you need. For a wired keyboard or mouse, check whether the monitor has a built-in USB hub with usable accessory ports. Otherwise, you will need a suitable hub or adapter.
The adapter must support three separate jobs
USB-C describes the connector. The functions available through it depend on the equipment. VESA explains that compatible USB-C connections can carry video, USB data, and charging power simultaneously.
| Job | What it does | What to look for |
|---|---|---|
| Video | Shows the Deck’s picture on the monitor. | USB-C video output or DisplayPort Alt Mode on the socket used for the monitor. |
| Charging | Sends charging power back to the Deck. | USB-C Power Delivery (PD) passthrough to the host device—the Steam Deck—and a documented power connection. |
| USB data | Lets the Deck use a keyboard or mouse. | A USB-A data port that works while the monitor and charger are connected. |
A socket marked PD IN is usually for the charger. A socket marked USB-C DATA may be for accessories without video support. Check the manual’s port descriptions rather than assuming every USB-C socket does the same thing.
If you want the monitor to send power back to the Deck through the adapter, ask the manufacturer this specific question: “Can this adapter carry video to my USB-C monitor, pass the monitor’s charging power back to my Steam Deck, and run a USB-A keyboard or mouse at the same time?” Include your monitor model and charger details.
Choose the connection that fits your monitor
| Setup | Useful when | Where the charger connects |
|---|---|---|
| Direct USB-C connection | The monitor supports charging the Deck, and you can use Bluetooth accessories or the monitor’s own USB hub. | To the monitor’s designated power input; the monitor supplies power to the Deck. |
| Hub with USB-C video output | Your monitor uses USB-C video and you need wired USB accessories. | Typically to the hub’s PD input. Check the hub’s power output and whether the monitor needs its own power supply. |
| Dock with HDMI output | Your portable monitor also has HDMI or mini-HDMI input. | To the dock’s PD input for the Deck. Power the monitor separately as its manual requires. |
An HDMI dock needs an HDMI connection on the monitor. Its spare USB-C charging socket is not automatically a USB-C video output. Valve’s official dock specifications, for example, list HDMI and DisplayPort for displays, with a separate USB-C power input.
For monitors with HDMI input, our guide to USB-C hubs with HDMI output explains another connection option. Apply the port and charging checks above to any model you consider.
Check how much charging power reaches the Deck
Valve lists a 45W USB-C Power Delivery charger for both the Steam Deck LCD and Steam Deck OLED. When you add a hub and monitor, check how much power remains for the Deck after the other equipment’s needs.
The advertised wattage may describe the adapter’s maximum input. For example, StarTech’s HB31C3A1CDPPD3 datasheet lists 100W PD input, reserves 18W, and specifies up to 82W for charging the connected computer. Your adapter’s figures may differ.
Look for power available to the host and the monitor port’s output, not just the largest number on the listing. Follow the manufacturer’s charger requirements. A working picture does not prove that the Deck is also receiving enough power to maintain its battery during a game.
With compatible USB PD equipment, the devices agree on the charging power. A higher-rated charger does not force the Deck to take its full rated output; USB-IF describes this power negotiation.
Set up the hub one connection at a time
Once you have confirmed the hub’s video and charging support, use this checklist. If its manual specifies a connection order, follow that order.
- Identify the ports. Find the connection for the Deck, the charger input, and the video output.
- Connect the power supply. Plug the charger into the hub’s designated PD input.
- Connect the monitor. Use the hub’s USB-C video output or HDMI output, as appropriate. Supply separate monitor power if required.
- Connect the Steam Deck. Use the hub’s host cable or the connection specified in its manual.
- Check picture and charging first. Then add the keyboard or mouse and confirm that it responds.
Use a USB-C cable whose specifications include video support. A cable intended only for charging will not carry the monitor’s picture.
For a practical check, try your usual game with the battery below full and watch the battery level over a short session. Check that the picture stays stable and the accessories keep working. Reconnect the setup once to confirm that the result is repeatable.
If something does not work
| Symptom | First check | Next test |
|---|---|---|
| No picture | The monitor input, adapter’s video port and cable’s video support. | Try the monitor directly with the Deck. If a display is detected, try a lower resolution or refresh rate. |
| Picture works, but the battery fails | The charger connection and power available to the Deck. | Test the Deck with its original charger alone, then recheck the monitor or hub’s power requirements. |
| Keyboard or mouse does not respond | Whether the USB-A socket carries data and has any connection conditions. | Try a keyboard or mouse that works on another device, using a menu or app that accepts it. Check the adapter’s manual. |
| The picture flickers or devices disconnect | Power requirements, cables and the selected display mode. | Remove extra accessories and add them back one at a time. Test with the recommended power supply. |
Valve’s docking support guide covers display detection, lower-resolution tests, and slow-charge warnings. These symptoms can have several causes; a failed connection does not immediately identify a faulty Deck or monitor.
Before you buy, confirm these five points
- The adapter’s monitor socket supports USB-C video output if your screen needs it.
- It can charge the Deck while the monitor and USB accessory are connected.
- The instructions show exactly where the charger plugs in.
- The available power suits both the Deck and the monitor.
- The manufacturer confirms the required functions for your exact monitor and Steam Deck setup.
Choose the simplest documented setup that meets your needs. Try a direct connection first. Add a hub when you need extra ports, and treat an unclear compatibility claim as a question to resolve before buying.
Technical review: October 12, 2026. This guide uses published specifications and support documentation from Valve, VESA, USB-IF, and equipment manufacturers.