Samsung TV Says No Signal on HDMI: How to Fix It
"No Signal" means your Samsung TV isn't receiving video on the input you selected — not that the TV is broken. Nearly every case comes down to the wrong source, a loose or bad HDMI cable, a device that isn't sending a picture, or (on One Connect models) the box between the TV and your gear.
Quick answer
"No Signal" means the TV isn't receiving video on the selected input. Almost always it's the wrong source, a loose HDMI cable, or a connected device that isn't sending a picture.
- 1.Press Home, open Connected Devices (Source) and select the exact HDMI number your device is plugged into — with the device switched on.
- 2.Unplug the HDMI cable at both ends, reconnect it firmly, and try a different HDMI port if the message persists.
What it means
"No Signal" is not an error inside the TV — it's the TV reporting that nothing usable is arriving on the HDMI input you have selected. The panel, the apps and the tuner can all be perfectly fine while one input shows this message.
That narrows the problem to four places: the source selection on the TV, the HDMI cable, the device on the other end of that cable (cable box, console, streaming stick), or — on models that use one — the One Connect box that sits between your devices and the screen. Samsung's own troubleshooting for this symptom works through exactly those four in order.
Common causes
- Wrong source selected. The device is plugged into HDMI 2 but the TV is showing HDMI 1. The most common cause by far, especially after someone else used the TV.
- Loose or faulty HDMI cable. A cable that isn't fully seated at either end — or has a damaged conductor — delivers nothing, and the TV reports No Signal.
- Connected device off or asleep. Cable boxes, consoles and sticks go into standby. A device that isn't actively outputting video looks identical to an unplugged one.
- One Connect box issue. On The Frame and One Connect QLED models, everything routes through the box. A loose One Connect cable or a failing box blanks every input at once.
- Damaged or dirty HDMI port. Bent pins, debris or a worn port on the TV (or the device) can break the connection even with a good cable.
- Signal format the port isn't set for. High-bandwidth 4K/HDR signals need the port's enhanced mode (Input Signal Plus) enabled; mismatches can end in a failed handshake.
Before you start
- Confirm the connected device is actually powered on and awake — wake it with its own remote before touching anything else.
- Note which physical HDMI port the cable enters (the number is printed next to the port) so you can match it to the source list.
- Check whether the message appears on every input or just one. All inputs failing points at the TV or One Connect box; one input failing points at that cable, port or device.
Fixes, from safest to last resort
Select the correct HDMI source
No data loss- 1Look at the back of the TV (or the One Connect box) and note the number of the port your device is plugged into.
- 2Press Home on the remote, open Connected Devices / Source, and pick that exact HDMI number.
- 3Make sure the device on the other end is switched on and playing something.
Samsung lists source mismatch as the first thing to rule out — if the cable box is on HDMI 1, the TV has to be set to HDMI 1.
Power cycle the TV and the connected device
No data loss- 1Unplug the TV from the wall and unplug the connected device too.
- 2Wait 60 seconds so both fully power down.
- 3Plug both back in, turn the device on first, then the TV, and reselect the input.
This forces a fresh HDMI handshake between the TV and the device, which clears many intermittent no-signal cases.
Reseat the HDMI cable at both ends
No data loss- 1Unplug the HDMI cable from the TV (or One Connect box) and from the device.
- 2Check both connectors and ports for debris or bent pins.
- 3Reconnect the cable firmly at both ends until it's fully seated, then retry.
Try another port, another cable, another device
No data loss- 1Move the cable to a different HDMI port on the TV and select that new source. If the picture appears, the original port is the problem.
- 2Swap in a known-good HDMI cable. If that fixes it, replace the cable.
- 3Plug a different device into the same port. If the second device works, the fault is in the original device's HDMI output — check its own display/output settings.
These three swaps isolate the failure to the port, the cable or the device in a couple of minutes.
Run the built-in HDMI cable test
No data loss- 1Open Settings → Support → Device Care → Self Diagnosis.
- 2Choose HDMI Troubleshooting (shown as HDMI Cable Test under Signal Information on some models) and select the port your device uses.
- 3Start the test and follow the result — if the cable fails, replace it.
Available on recent Tizen models; on older TVs Self Diagnosis sits directly under Settings → Support. Samsung notes the test is designed for cables under about 2 m (6 ft) — longer cables may not test accurately.
Check the One Connect box (models that have one)
No data loss- 1Unplug and firmly reconnect the One Connect cable at both ends — at the box and at the TV — plus the box's power cord.
- 2Reseat your device's HDMI cable in the box, not the TV: on these models every input goes through the box.
- 3As a diagnostic, disconnect the One Connect box entirely: Samsung's guidance is that if the TV shows anything on screen (a message or picture) with the box disconnected, the box itself is faulty and needs service.
Match the port's signal mode to the device (Input Signal Plus)
Re-setup needed- 1Open Settings → General → External Device Manager → Input Signal Plus (called HDMI UHD Color on older models).
- 2For a 4K/HDR device (modern console, 4K streamer), turn Input Signal Plus ON for its port.
- 3For an older device that shows no signal with it on, turn it OFF for that port, then restart both devices.
Input Signal Plus controls whether a port accepts high-bandwidth signals. Toggling it is a widely reported fix in Samsung's own community for handshake-related no-signal cases, though it isn't listed in every official article — if it makes no difference, set it back and move on.
Update the TV firmware
Re-setup needed- 1Open Settings → Support → Software Update → Update Now.
- 2Install any pending update and let the TV restart.
- 3Retry the input. HDMI handshake fixes ship in firmware updates from time to time.
If a menu doesn't match your TV
- On 2022 and newer models the diagnosis tools live under Settings → Support → Device Care → Self Diagnosis; on older Tizen models Self Diagnosis is directly under Settings → Support.
- Only certain models (The Frame and higher-end QLED/Neo QLED) use a One Connect box — if your inputs plug straight into the TV, skip that step.
- A factory reset is not part of Samsung's troubleshooting for this symptom: No Signal is a source/cable/port problem, so resetting the TV's software rarely changes anything.
When to contact support
Request Samsung service if a specific HDMI port fails with a known-good cable and device, if the TV shows an image only when the One Connect box is disconnected, or if every input stays blank after all steps above:
- Have your model number ready (Settings → Support → About This TV, or the label on the back).
- Tell them the result of the port/cable/device swaps and the built-in HDMI cable test — it saves a whole diagnostic round.
- One Connect boxes are replaceable as a part; mention the disconnect test result if yours failed it.
Sources
- Official source: Samsung Support — Samsung TV HDMI ports are not working · 2026-07-12www.samsung.com
- Official source: Samsung Support (US) — Samsung TV has no picture or shows a black screen · 2026-07-12www.samsung.com
- Official source: Samsung Support — How to fix a no-picture issue with your One Connect box · 2026-07-12www.samsung.com
- Official source: Samsung Support — Self Diagnosis options on your Samsung Smart TV · 2026-07-12www.samsung.com
Frequently asked questions
Why does my Samsung TV say No Signal when everything is plugged in?+
Plugged in isn't the same as connected and transmitting. The usual culprits are the TV showing a different HDMI number than the one the cable uses, a cable that isn't fully seated, or a device sitting in standby. Match the source to the physical port, reseat the cable and wake the device.
Does No Signal mean my Samsung TV is broken?+
Rarely. The message only says nothing is arriving on that input. If a known-good cable and device fail on one specific port but work on another, that single port may be damaged — that's a service case, but the rest of the TV is fine.
Can the One Connect box cause No Signal on every input?+
Yes. On The Frame and One Connect QLED models, every device routes through the box, so a loose One Connect cable or a failing box blanks all inputs at once. Reseat its cable at both ends; Samsung's diagnostic is that if the TV displays anything with the box disconnected, the box needs replacing.
Will a factory reset fix No Signal on HDMI?+
Almost never, and Samsung's troubleshooting for this symptom doesn't include one. No Signal is a physical or handshake problem between the port, the cable and the device — work through source, cable, port and device swaps instead of wiping your TV's settings.
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