Not all USB-C ports support video output. You should check the specifications on your particular model.

Only USB-C port with USB 3.1 or above version can stream video.

Answer from Craig Long on learn.microsoft.com
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Mokin
mokinglobal.com › home › hub & adapter › [solved] usb c to hdmi adapter cable not working
USB C to HDMI Adapter Cable Not Working - how to fix it
October 27, 2025 - For Windows users, if your USB-C to HDMI adapter does not work, the issue maybe connect with dedicated driver.In order to solve this issue,we suggest you update the USB to HDMI driver on the official website.Alternatively, recently installed ...
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Reddit
reddit.com › r/mac › usb c to hdmi not working on tv.
r/mac on Reddit: USB C To HDMI not working On TV.
November 5, 2023 - Sometimes usb to hdmi doesn’t work if your mac is not plugged in to the charger. ... Upgrade your os. Had the same issue and updated today. Fixed. ... The thing that fixed it for me was changing the HDMI Auto Setting (under setup on my panasonic TV) to "Mode 1" instead of "Mode 2".
Videos
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Selore
seloreglobal.com › blogs › selore › troubleshooting-usb-c-to-hdmi-adapter-issues-a-comprehensive-guide
Troubleshooting USB C to HDMI Adapter Issues: A Comprehensive Guide – Selore
Otherwise, try connecting the adapter to an alternative port. If your adapter is not working properly, another potential reason could be that the HDMI port is not compatible with the adapter.
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Dockteck
dockteck.com › home › troubleshooting usb-c to hdmi adapter: tips for fixing this common issue
Troubleshooting USB-C To HDMI Adapter: Tips for Fixing This Common Iss – Dockteck
We suggest conducting online research to discover the best HDMI adapter for your devices. Try switching on and off your phone and device while the connection is established. The action will restart the connection and eliminate compatibility if any.
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HP Support
h30434.www3.hp.com › t5 › Desktop-Video-Display-and-Touch › USB-C-to-HDMI-Isn-t-Working › td-p › 8933207
Solved: USB C to HDMI Isn't Working - HP Support Community - 8933207
December 7, 2023 - Here's a step-by-step troubleshooting guide to help you identify and resolve the problem: Ensure that both ends of the USB-C to HDMI cable are securely connected to the respective ports on your devices (e.g., laptop and monitor/TV).
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uni
uniaccessories.com › home › blog
[Solved] USB C to HDMI Adapter Cable Not Working in 2023 - uni
Hey Ned, you mentioned the usb c to HDMI works with laptop but not your S9. It seems the usb c to HDMI is just fine, the issue should be S9 connection. Check out the complete steps, To connect the HDMI Adapter to your device, follow these steps: · 1. Connect one end of a universal HDMI cable into the HDMI Adapter. · 2. Connect the other end to the HDMI port on your TV.
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Cabletime Tech
cabletimetech.com › home › knowledge › knowledge
Troubleshooting USB-C To HDMI Adapter: Tips for Fixing This Common Issue
December 13, 2023 - To address this issue, adjust the display resolution settings on your device to match the supported resolution of the external display. If the resolution is not matched, the signal may be interrupted.
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Reddit
reddit.com › r/usbchardware › usb-c to hdmi suddenly stopped working
r/UsbCHardware on Reddit: USB-C to HDMI suddenly stopped working
September 25, 2023 -

I have been using an HDMI cable + HDMI to USB-C adapter to connect two monitors to my laptop. My main monitor is directly plugged in to the HDMI-socket, and the USB-C adapter to the only USB-C socket on the laptop. It's been working flawlessly until yesterday. Now the second monitor just displays "No HDMI signal" and goes to sleep mode. It does not even recognize me plugging in the USB-C cable. Take note that I've done zero (0, nil, no) changes to my setup.

Naturally I thought that the adapter was faulty since I did some testing with the USB-C socket (it charged my iPhone), and the HDMI-cable was working. Purchased a new HDMI to USB-C cable but to no avail.

On my laptop the device manager shows my monitor as a "BillBoard Service".

Has anyone run into this problem? Google is not my friend in this matter, even though I am a man of lurking the internet. Can someone point me in the right direction here?

Many thanks.

Edit: Okay so it got solved by turing the laptop off, then holding the on button for 30 seconds and letting go. What this triggered I have no idea but it might help someone out.

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This is the first post I've found with this problem! I have the same set-up; a Dell laptop with HDMI port and two USB-C ports. HDMI port connects to an external monitor, one USB-C connects to a power supply, the other to an external monitor with a USB-C to HDMI cable. The USB-C ports are interchangeable as to function. This works fine most of the time, but sometimes when I boot it, the USB-C-connected monitor doesn't get a signal. "Display Settings" shows all 3 displays, but the misbehaving one is shown smaller, and listed as "Disconnect this display". Changing the dropdown box doesn't work. It won't change from "Disconnect this display". This only seems to happen at boot time. I've switched monitors, switched USB-C ports, even bought a USB-C to DisplayPort cable, but the issue pops up randomly anyway, so I'm pretty sure it is not a hardware problem. Most days it works fine, but some days it just doesn't. This is a work-issued laptop, on which I do NOT have administrator privileges, so updating drivers or mucking with the BIOS is out of the question. Since it isn't reliably reproducible, and I work from home, getting the company's IT department involved would be an exercise in futility. The only ways I've found to fix it are to reboot, or to superstitiously flip the USB-C connector over a time or two. I am a software engineer and electronics technician, so I have some small expertise. I believe the display driver is to blame, but I can't prove anything. I think there's some boot-time sequence that doesn't always go just right. FWIW, my display adapter shows as Intel(R) Iris(R) Xe Graphics, Driver Version 31.0.101.3959. It's very frustrating and annoying when it happens, but I don't have any better solution than this.
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Dude, I had the exact same problem and I tried your solution and it worked! Thank you so much! Now I’m curious what caused it as well. I know I recently updated my GeForce drivers so maybe after certain updates you have to do a hard reset?
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4291173 › usb-c-to-hdmi-adapter-doesn-t-work
USB-c to hdmi adapter doesn’t work - Microsoft Q&A
Top answer
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Not all USB-C ports support video output. You should check the specifications on your particular model.

Only USB-C port with USB 3.1 or above version can stream video.

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Hi Lucy. I'm Greg here to help.

I see a lot of reported issues with USB-C to HDMI adapters, in fact any adapters for monitors in Windows are very likely not to work for many reasons because the native method is always much, much better.

But you can troubleshoot USB-C to HDMI monitor connections not working to see if one of these fixes work - I've collected them all:

https://sortatechy.com/usb-c-cable-with-monitor/

https://www.partitionwizard.com/partitionmanage...

https://usbcafe.com/usb-c-to-hdmi-not-working-s...

https://uniaccessories.com/blogs/blog/solved-us...

https://www.youtube.com/watch?v=7IRLYIXz2TA

Feel free to ask back any questions. If you'll post back detailed results then I may know what to suggest next, if necessary.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

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Framework Community
community.frame.work › community support
Usb c to multiport hub hdmi port not showing display to tv - Community Support - Framework Community
September 26, 2024 - I have bought a usb c to multiport hdmi hub all the other ports work but the hdmi port when I plug it to upper two usb c port to that hub and connect the hdmi port the tv shows no signal I am on ubuntu 24.10 with fw13 amd 7840u this is the hub i bought : USB C Hub with Ethernet Adapter, 8 In ...
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CableCreation
cablecreation.com › blogs › news › usb-type-c-to-hdmi-cable-0715
What to Do if Your USB Type C to HDMI Cable Disconnects Frequently? – CableCreation
July 19, 2024 - Wrong input source selected: Confirm on the TV that the correct HDMI input source is selected. Stable connection: Make sure the CableCreation USB Type-C to HDMI cable is securely plugged into the USB-C device and the monitor’s HDMI port.
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MiniTool Partition Wizard
partitionwizard.com › home › partition manager › top 5 solutions to usb to hdmi adapter not working
5 Easy Solutions for USB to HDMI Adapter Not Working
November 28, 2024 - If you find the USB C to HDMI adapter not working issue, the issue may be related to a dedicated driver.
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Mokin
mokinglobal.com › home › mst hub › usb c to hdmi hubs not working -- how to fix?
USB C to HDMI Hubs Not Working -- How to Fix?
October 18, 2024 - Click on “View optional updates” and then click “Download & install.” to install any available updates. Once the drivers are installed, restart your device and see if it works well. Most users have reported that their USB C to HDMI connections ceased functioning after the recent Windows 10 update.
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YouTube
youtube.com › watch
Troubleshooting Guide: USB C to HDMI Adapter Cable Not ...
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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Apple Community
discussions.apple.com › thread › 255156987
iPhone 15 Prox Max USB-C to HDMI Issue - Apple Community
Ok, for what it’s worth, I found a $10 JSAUX USB C to HDMI Adapter on Amazon (B08QYPWM4L) that says in the description that it works with the iPhone 15 Pro Max and iPhone 15 Pro and it just came in today. I plugged it into 2 different TVs and a monitor and had success on all 3 devices without having to change HDMI type or any settings on the TV. ... An update for those with the same issue, I have found a solution. I use an iPhone 15 Pro Max with an USB-C to HDMI Cable on an LG 4k tv. I was flickering and not displaying at all, same as reported by the OP.
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SlashGear
slashgear.com › 1810840 › reasons-usb-c-to-hdmi-not-working
4 Reasons Your USB-C To HDMI Isn't Working - SlashGear
March 17, 2025 - If you find that your device's USB-C port is compatible with DP Alt Mode, but the USB-C to HDMI cable is still not recognized, then it indicates that there's an issue with the cable itself. To confirm this, you need to use the cable with any other device and test all the components of the cable, including the USB-C and HDMI adapter, individually. If the cable isn't working on the other device as well, then it's time for you to purchase a new USB-C to HDMI cable.
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Vcom
vcom.com.hk › shows › 169 › 438.html
How to Solve USB C to HDMI Adapter/Docking Not Working - Blog - - VCOM International Ltd
Insufficient power or poor-quality cables can lead to unstable connections. For example, using a low-quality HDMI cable might result in screen flickering. Compatibility issues with Thunderbolt/Charging USB Type-C port: Not all USB-C ports are created equal, and some may have compatibility issues ...
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USB Cafe
usbcafe.com › usb-c-to-hdmi-not-working-solved
SOLVED: USB-C to HDMI Adapter Cable Not Working (2023) – USB Cafe
If you are able to verify that all the 4 ports of the USB C are functioning optimally by being able to supply DP Alt Mode, then check to be sure the HDMI to HDMI cable works fine and if so, then you will have to replace the USB-C to HDMI Adapter.
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Windows Report
windowsreport.com › fix › laptop & pc › usb to hdmi adapter not working
How to Fix USB-C to HDMI Not Working Windows 11
May 14, 2025 - If your USB C to HDMI is not working, it might be related to your driver or the USB port. Updating the driver or switching ports should help.
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Google Support
support.google.com › pixelphone › thread › 276177257 › no-picture-on-tv-with-usb-c-to-hdmi-cable
No picture on TV with usb c to hdmi cable - Google Pixel Community
Our software update is being released in phases. New features will gradually roll out across all regions. Learn more about Pixel software updates