- TVs
- Smart TV
Mode Not Supported
Samsung "Mode Not Supported" on Smart TV: input resolution not accepted
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The TV is receiving an HDMI resolution it cannot accept. Set the connected device to a fixed resolution the TV supports, turn both off, then turn the TV on first and the device about 15 seconds later.
Safety first
Stop and check this first
- Do not force resolutions or refresh rates your TV does not support from a computer or console: the message will return even if the cable and TV are fine.
Safe checks you can perform
- Connected device resolution
- Power cycle the TV and the device in order
- Shorter HDMI cable
- Another HDMI device and a TV software update
Leave these tasks to a qualified professional
- Do not attempt this professional task: Support from the external device maker
- Do not attempt this professional task: Samsung diagnosis if no device works
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Support from the external device maker
What they doIf another HDMI device works at the same resolution, the maker of the original device checks its video output and settings.
They must show youthe resolution the device outputs after the check.
In writingthe setting changed or the repair done.
Samsung diagnosis if no device works
What they doIf no HDMI device displays at any supported resolution, Samsung service checks the TV's HDMI inputs.
They must show youthe input test with a known good device.
In writingthe diagnosis and, if a part is replaced, its reference and the reason.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Connected device resolution
No special tools
Procedure
- Who:
- you.
- How:
- in the picture or display menu of the connected device, choose a fixed resolution your TV supports (480i/p, 720p, 1080i/p or 2160p) instead of the automatic option.
- Result that matters:
- whether the picture appears with the fixed resolution.
- If it appears:
- the output format was the cause; keep that fixed resolution.
- If the message stays:
- power cycle both devices in order.
- Evidence to keep:
- a photo of the device's resolution menu.
Evidence: Samsung TV or projector shows an error message
- 2
Power cycle the TV and the device in order
No special tools
Procedure
- Who:
- you.
- How:
- turn off the TV and the external device. Turn the TV on, wait about 15 seconds, then turn the external device on. This repeats the HDMI handshake between them.
- Result that matters:
- whether the picture appears after the ordered restart.
- If it appears:
- the HDMI handshake had failed.
- If it stays:
- check the cable.
- Evidence to keep:
- note whether the message returns and when.
Evidence: Samsung TV or projector shows an error message
- 3
Shorter HDMI cable
No special tools
Procedure
- Who:
- you.
- How:
- try an HDMI cable of 6 feet or shorter. If you need more than 12 feet, use an ISF rated cable, as Samsung advises.
- Result that matters:
- whether the message disappears with the short cable.
- If it disappears:
- the long cable was the cause.
- If it stays:
- try another HDMI device at the same resolution.
- Evidence to keep:
- length and type of the cable that fails and of the one that works.
Evidence: Samsung TV or projector shows an error message
- 4
Another HDMI device and a TV software update
No special tools
Procedure
- Who:
- you.
- How:
- connect another HDMI device at the same resolution to that input. Then update the TV software from All Settings, Support, Software Update, Update Now.
- Result that matters:
- whether the other device displays correctly.
- If it does:
- the TV is not the source; check with the maker of the original device.
- If it does not:
- contact Samsung Support with what you tried.
- Evidence to keep:
- models of the failing and working devices and the TV software version.
Evidence: Samsung TV or projector shows an error message
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- TVs
- Brand
- Samsung
- Product type
- Smart TV
Known code variants
- mode not supported samsung tv
- Modo no admitido
- Modo no compatible
- Samsung TV mode not supported
What it means
Samsung shows "Mode Not Supported" when the selected source (cable box, player, console or computer) sends a resolution the TV cannot display. Samsung lists 480i/p, 720p, 1080i/p and 2160p as supported. It can also appear with long HDMI cables or when the external device picks its output automatically. The message is about the incoming signal: it does not mean the panel or a board is faulty.
Warnings and stop conditions
- Loweditorial warning
Do not force resolutions or refresh rates your TV does not support from a computer or console: the message will return even if the cable and TV are fine.
Evidence: Samsung TV or projector shows an error message
Symptoms and causes
Probable causes · in order
- Unsupported output resolutionCommon
The external device sends a format outside Samsung's list; the message goes away once you fix 1080p or 2160p on that device.
Evidence: Samsung TV or projector shows an error message
- Automatic output on the external devicePossible
The device changes resolution with the content, so the message appears with some content and not with other content.
Evidence: Samsung TV or projector shows an error message
- Long or low quality HDMI cablePossible
It happens with one cable or one longer than 6 feet and goes away with a short one; Samsung asks for an ISF rated cable beyond 12 feet.
Evidence: Samsung TV or projector shows an error message
- Signal fault on the original devicePossible
Another HDMI device at the same resolution works on the same TV, which points to the original device rather than the TV.
Evidence: Samsung TV or projector shows an error message
Virtual technician
Does Mode Not Supported still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Samsung TV or projector shows an error message
Samsung · 2026 · official_doc
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