Samsung TV Error Code 4K2: How to Fix It
Easy 15-45 minutes Medium Severity
Verified June 2026
- Error Code
- 4K2
- Brand
- Samsung TV
- Product Type
- smart_tv
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 15-45 minutes
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Tools You'll Need
- Certified Ultra High Speed HDMI 2.1 cable (48 Gbps rated)
- Internet connection (for firmware update)
- Flashlight or phone camera (to inspect HDMI ports for bent pins or debris)
- TV remote and source device remote
How to Fix Error Code 4K2
-
Power Cycle the TV and Source Device
Always unplug devices from the wall — not just power them off with a remote — to fully discharge capacitors and reset internal chips. -
Swap to a Certified Ultra High Speed HDMI Cable
Do not force a cable into the port. If you feel resistance, inspect the port for debris or bent pins before proceeding. -
Try a Different HDMI 2.1 Port on the TV
-
Lower the Output Resolution or Refresh Rate on the Source Device
-
Enable or Adjust HDMI Input Signal Plus (UHD Color) on the TV
-
Update the TV Firmware
Do not unplug the TV during a firmware update. Interrupting the process can corrupt the firmware and require a service visit. -
Reset HDMI or Picture Settings to Default
A factory reset will erase all customized picture modes, Wi-Fi credentials, and app logins. Back up any important settings if your TV model supports an export option. -
Test with an Alternative Source Device
Parts You May Need
Ultra High Speed HDMI 2.1 Cable
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Ultra High Speed HDMI 2.1 Cable
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Ultra High Speed HDMI 2.1 Cable
Check Price on Amazon
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When to Call a Professional
Contact Samsung Support or a certified TV repair technician if: the error appears on all HDMI 2.1 ports with multiple cables and devices after a firmware update; you can see physically bent or corroded pins inside the HDMI port; the TV was recently dropped or exposed to liquid; or the TV is still under warranty (Samsung typically offers a 1-year limited warranty and may replace defective HDMI ports at no cost). Do not attempt to open the TV panel yourself — internal components carry dangerous stored voltages even when unplugged.Frequently Asked Questions
What does error code 4K2 mean on a Samsung TV?
Error code 4K2 on a Samsung TV means the TV's HDMI 2.1 port was unable to complete a signal negotiation (handshake) with the connected device. This prevents the high-bandwidth 4K/120Hz or 8K signal from being established and usually shows a black screen or error message.
Does any HDMI cable work for HDMI 2.1 on a Samsung TV?
No. You must use a cable specifically certified as 'Ultra High Speed HDMI' rated for 48 Gbps. Standard HDMI cables (including many labeled HDMI 2.0) do not have the bandwidth required for HDMI 2.1 features like 4K/120Hz, 8K/60Hz, or Variable Refresh Rate (VRR), and will cause negotiation failures.
Which HDMI ports on my Samsung TV support HDMI 2.1?
This varies by model. On most Samsung QLED and Neo QLED TVs from 2020 onward, HDMI port 4 is the primary HDMI 2.1 port; some models also support it on port 1. Check the label printed next to each port on the back of your TV or consult your model's user manual for confirmation.
Why does my PS5 or Xbox Series X show error 4K2 on my Samsung TV?
The PS5 and Xbox Series X output at 4K/120Hz using HDMI 2.1, which requires both a certified Ultra High Speed HDMI cable and the TV's HDMI UHD Color (Input Signal Plus) setting to be enabled for that specific port. Make sure both conditions are met. Also update both the console firmware and the TV firmware to the latest versions for best compatibility.
Will a factory reset fix Samsung TV error code 4K2?
A factory reset can fix error 4K2 if it is caused by corrupted or misconfigured display/signal settings. However, it will not fix a physical cable problem or a defective HDMI port. Try the simpler steps first (cable swap, Input Signal Plus setting, firmware update) before resorting to a full reset.