Samsung TV Error Code 4K1: How to Fix It

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
4K1
Brand
Samsung TV
Product Type
smart_tv
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Samsung TV error code 4K1 appears when your television cannot detect a 4K signal from the connected source device, such as a 4K Blu-ray player, streaming box, or gaming console. This typically happens due to an incompatible HDMI cable, incorrect TV input settings, or a mismatch between the source device's output resolution and what the TV expects. The good news is that most 4K1 errors can be resolved at home without any special tools or technical expertise.
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Tools You'll Need

How to Fix Error Code 4K1

  1. Power Cycle Your TV and Source Device

    Always unplug devices from the wall rather than just using the remote to power them off. This ensures a full power reset.

  2. Check and Replace Your HDMI Cable

  3. Enable HDMI UHD Color (4K Input Mode) on Your TV

  4. Verify the Source Device Output Resolution

  5. Update Your Samsung TV Firmware

  6. Disable HDR or Change the Picture Mode Temporarily

  7. Perform a Smart Hub Reset

    Resetting Smart Hub will log you out of all streaming apps and you will need to sign back in. Make sure you know your streaming service credentials before proceeding.

  8. Factory Reset the TV as a Last Resort

    A factory reset will erase all personalized settings, app logins, and network configurations. Write down your Wi-Fi password and app credentials before performing this step.

Parts You May Need

HDMI 2.0 High Speed Cable
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HDMI 2.1 Ultra High Speed Cable
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HDMI 2.0 High Speed Cable
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HDMI 2.1 Ultra High Speed Cable
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HDMI 2.0 High Speed Cable
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HDMI 2.1 Ultra High Speed Cable
Check Price on Amazon
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When to Call a Professional

Contact Samsung support or a certified TV technician if you have tried all steps above and the error persists, especially if the HDMI ports themselves appear physically damaged, bent, or loose. If your TV cannot detect any 4K source across multiple HDMI ports and multiple known-good cables, there may be an internal hardware failure on the HDMI board or the main processing board. Repairs of this nature require professional diagnosis and component replacement. You can reach Samsung support at 1-800-726-7864 or schedule an in-home service visit through Samsung's official website.

Frequently Asked Questions

What does Samsung TV error code 4K1 mean?
Error code 4K1 on a Samsung TV means the television is unable to detect or recognize a 4K (Ultra HD) signal from the device connected to one of its HDMI inputs. This is usually caused by an incompatible HDMI cable, a disabled HDMI UHD Color setting on the TV, or incorrect output settings on the source device.
Which HDMI port on a Samsung TV supports 4K?
On most Samsung TVs, all HDMI ports are physically capable of carrying a 4K signal, but you must enable HDMI UHD Color for each port individually in Settings > General > External Device Manager > HDMI UHD Color. Some models may label one or two ports as dedicated 4K or ARC/eARC ports — these are typically the best ports to use for 4K devices. Check your TV's manual or the port labeling on the back panel for specifics.
Do I need a special HDMI cable for 4K on my Samsung TV?
Yes. To reliably transmit a 4K signal, you need a High Speed HDMI cable rated for HDMI 2.0 or higher. For 4K at 120Hz or 8K content, you need an Ultra High Speed HDMI 2.1 cable. Standard or older HDMI 1.4 cables can only handle 4K at 30fps and may cause signal detection issues. Always look for cables that are labeled 'High Speed' or 'Ultra High Speed' on the packaging.
Why does my Samsung TV show 4K1 even with a 4K device connected?
Even with a 4K-capable device connected, the 4K1 error can appear if the HDMI UHD Color setting is not enabled for that specific HDMI port, if the source device itself is not set to output 4K resolution, if the HDMI cable does not support 4K bandwidth, or if the TV's firmware is outdated. Work through each of these possibilities systematically — the most common culprit is the HDMI UHD Color setting being turned off.
Will a factory reset fix the Samsung TV 4K1 error?
A factory reset can fix the 4K1 error if it is caused by corrupted settings or a software glitch within the TV's firmware. However, it should be treated as a last resort because it erases all your personalized settings and app logins. Try simpler fixes first — power cycling, swapping the HDMI cable, enabling HDMI UHD Color, and updating the firmware — before resorting to a factory reset.

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