1. Open the Settings menu on your Samsung device.
  2. Tap on Connections which should be the topmost setting.
  3. Now scroll to the bottom and tap on More connection settings.
  4. Select HDMI mode from the options.
  5. A small window should appear with the HDMI options — Samsung DeX and Screen mirroring.

Select either of the two based on your preference.

Answer from karthik nair on Stack Exchange
🌐
Samsung
samsung.com › home › product help & support › mobile › how to use a samsung usb-c to hdmi adapter
How to use a Samsung USB-C to HDMI adapter | Samsung Philippines
You can connect your mobile device to an external display using an HDMI adapter (USB Type-C to HDMI). Connect an HDMI adapter to your mobile device. Connect an HDMI cable to the HDMI adapter to a TV or monitor’s HDMI port. On your phone’s screen, tap Start. The Samsung DeX screen will appear on the connected TV or monitor without changing your phone's screen. This feature is only available on the following devices: ... The information provided about the listed models may not cover all the details.
🌐
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
Sometimes the USB C to HDMI may not work properly because the device cannot recognize the connection properly. Therefore, connect the adapter to Samsung S8 first. Do not engage with the HDMI and the power cord.
🌐
Samsung Community
eu.community.samsung.com › samsung community › products › tablets
Solved: Galaxy Tab S6 Lite not connecting to TV (via USB C - HDMI) - Samsung Community
December 16, 2024 - I finally bought a "Google Chromecast TV" device and it works brilliantly with my TV. I wish I had not bought the Samsung S6 Lite (inaddition to the restriction put in by Samsung its battery life is pathetic). ... @TTS777: I'm not sure that it's possible to screen mirror using a standalone USB C to HDMI cable, as you may require an adapter similar to the one linked below (for reference only, as this is from the US site) https://www.samsung.com/us/mobile/mobile-accessories/phones/usb-c-to-hdmi-adapter--black-ee-hg950dbe...
🌐
Early Bird Club
forum.earlybird.club › tech forums › smartphones
Can't get HDMI output - SOLVED | Early Bird Club
October 2, 2022 - Samsung Tech Support said that "some S21s don't have HDMI out." What?!? They want me to bring my phone into a local repair shop to see if they can figure it out. This seems like utter nonsense to me. ... The problem has been corrected! I went to the repair shop and they had it working in 5 minutes. The issue? My USB port was dirty, so it couldn't make a connection.
🌐
Samsung Community
eu.community.samsung.com › samsung community › products › smartphones › other galaxy s series
USB-c to HDMI not working on S20FE - Samsung Community
January 9, 2023 - I have been using USB-C to HDMI to connect my phone to an older Samsung TV that doesn't support SmartView without any issues for a while. Recently this stopped working and neither screen mirroring nor Dex works. If I use the same set-up with my old S8 it works just fine, so it can't be the cable.
🌐
Reddit
reddit.com › r/samsunggalaxy › samsung galaxy s23 ultra usb c to hdmi not working
Samsung Galaxy s23 Ultra USB C to HDMI not working : r/samsunggalaxy
February 11, 2023 - If none of the above steps work, it's possible that there may be a hardware issue with the phone's USB-C port. In that case, you may need to take it to a Samsung service center for repair · Some questions to consider if nothing else works: Have you tried using a different HDMI cable with the adapter to see if that resolves the issue?
🌐
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
Check USB C and HDMI connections, ensuring they are properly inserted. Learn how to connect the adapter to devices and external displays correctly. Sometimes the USB C port on the device is unresponsive, causing problems with the connection ...
Find elsewhere
🌐
uni
uniaccessories.com › home › blog
[Solved] USB C to HDMI Adapter Cable Not Working in 2023 - uni
That means, no matter which UBS-C to HDMI Adapter, or USB-C to HDMI Cables you use, you cannot stream things to TV from Samsung Galaxy A02s. ... It is 100% sure that all 4 USB-C ports of MacBook Pro 16'' 2021 supply DP Alt Mode, but there is still got chance that you can not use the USB-C to HDMI Adapter normally. Please confirm your UBS-C port function well, and the HDMI to HDMI cable works properly.
🌐
USB Cafe
usbcafe.com › samsung-usb-c-to-hdmi-not-working
Samsung USB C To HDMI Not Working (Solutions) – USB Cafe
A: If your USB Type-C to HDMI cable is not working, then make sure that it matches the requirements. The USB Type-C to HDMI cable should support 4k resolution and at least a 60 Hz signal rate.
🌐
Galaxy S24 Manual
galaxys24manual.com › home › how to fix usb-c to hdmi not working on your samsung galaxy s24
How to Fix Usb-C to HDMI Not Working on Samsung Galaxy S24
December 27, 2024 - Use top-notch USB-C to HDMI adapters that fit your Galaxy S24’s needs. Paying attention to power and resolution settings helps a lot. If you still have trouble, Samsung’s support is there for you. They offer help through customer service and online forums. Keeping your device’s software up to date can also help avoid problems. The Samsung Galaxy S24 is a strong tool for working on the go.
🌐
Vcom
vcom.com.hk › shows › 169 › 438.html
How to Solve USB C to HDMI Adapter/Docking Not Working - Blog - - VCOM International Ltd
A damaged HDMI cable or a malfunctioning adapter can prevent the signal from being transmitted properly. ... Verify that the USB-C port supports video output: Check your device’s specifications or user manual to confirm that the USB-C port supports DP Alt Mode.
🌐
Reddit
reddit.com › r/usbchardware › usb-c to hdmi suddenly stopped working
r/UsbCHardware on Reddit: USB-C to HDMI suddenly stopped working
September 26, 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.

Top answer
1 of 5
1
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.
2 of 5
1
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?
🌐
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.
🌐
Bruisah's Blog
bruisah.wordpress.com › 2022 › 07 › 04 › samsung-dex-mode-not-working-with-hdmi-wired-connection
Samsung DeX Mode Not Working with HDMI Wired Connection | Bruisah's Blog
September 22, 2022 - Summary: (to avoid tl;dr syndrome): If Samsung DeX doesn't work on a wired USB-C - HDMI adapter, try externally powering the adapter rather than have it powered via your smartphone USB-C connection.
🌐
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.
🌐
Samsung Community
us.community.samsung.com › t5 › A-Series-Other-Mobile › Mirror-my-A32-5G-to-my-TV-with-a-USB-C-to-HDMI-cable › td-p › 2479932
Solved: Mirror my A32 5G to my TV with a USB-C to HDMI cab... - Samsung Community - 2479932
December 18, 2024 - I have an A32 5G that I would like to mirror to my TV. I do not have home WIFI, so I must use a cable. I've found that the common USB-C to HDMI cable will not work with the A32 because the A32 does not support MHL. However, I have seen some claims that if you get an MHL USB-C to HDMI cable, it will work.
🌐
VentionTech
ventiontech.com › home › blog › blog
How to Connect Phone to TV HDMI Using USB-C: A Clear Guide for Seamless Viewing
October 13, 2023 - If your USB-C to HDMI is not working, consider these possible reasons: Compatibility issues:Ensure your phone and TV support USB-C to HDMI connections. Connection problems:Check if the HDMI cable is securely connected to the adapter and the TV.