The best thing about HDMI is that it’s plug and play, and you don’t need to worry about compatibility. The standard works across devices and supports the fastest speeds for gaming and audio transfer from soundbars and surround sound systems. However, all electronic equipment and cabling can develop issues, and you’ll inevitably run into HDMI problems at some point.

Some issues are caused by common HDMI mistakes, while others can be because of configuration issues or faults. I’ll clear up common issues today with five reasons why your TV isn’t detecting HDMI devices.

You’re using the incorrect HDMI port

Choose the right one

It’s best to start at the bottom with the most common issue that’s easiest to fix. TVs have multiple HDMI ports, and you’ll get a blank screen or error message if you choose the wrong source. Fixing this issue is as simple as it gets and all you need to do is cycle through your HDMI sources with your remote to find the right input.

Sometimes using the wrong HDMI port can lead to other issues. For example, many TVs only have a single eARC-compatible HDMI port and your soundbar won’t work if it’s connected to any of the others. HDMI ports aren’t created equal, and you’ll find the ones on your TV offer different speeds. This means you won’t get those fast 120Hz fresh rates for gaming if your console is plugged into a slower port.

The solution to both of the above issues is to unplug your HDMI cable from the TV and then reconnect them to the correct port.

The cable is incompatible or faulty

Nothing lasts forever

HDMI cables are fairly durable, but eventually break or become faulty due to age-related degradation or environmental factors, like heat or moisture. When this happens, your TV might not detect the device or have an intermittent signal. You could also hear a crackling sound coming from the cable or experience picture or sound distortion.

The easiest way to assess the cable is to replace it with one that’s working to see what happens. You can also try the suspect cable on other devices to see if you get different results.

You could have functioning cables that might be older or incompatible with the latest speeds. Remember that the older HDMI versions, like HDMI 2.0, support 4K at 60Hz. You’ll need a faster, HDMI 2.1 cable to enjoy 4K at 120Hz, variable refresh rates (VRR), and eARC functions.

Using the latest, high-speed cables can solve the above issues, and they are backward compatible and will work on your older devices. Remember that HDMI signal gets weaker on cables over three meters, and it’s best to use shorter lengths for the best performance.

Incorrect resolution settings

Compatibility is key

Having the incorrect resolution settings on your input device can also have an impact on your display output. For example, your gaming console or PC could be set to 4K and a 120Hz refresh rate, but your TV or its HDMI port only supports 4K at 60Hz. In this case, you could get a blank screen on your TV because it can’t process the incoming signal.

The first way to resolve this issue is by rebooting the input device in safe mode and choosing a low resolution to see if it works. If it does, you can cycle through the resolution settings to see what’s the maximum your TV supports.

The second way is to try different cables and ports if you have a newer TV. As mentioned earlier, you need to have a compatible cable connected to a similarly capable port for the best results. Try a new high-speed device and ensure it’s attached to the HDMI 2.1 port to get the highest resolutions from connected devices.

HDCP Handshake issues

Anti-piracy inconvenience

You’ll need to know a little about HDCP to understand this. High-bandwidth Digital Content Protection (HDCP) is supposed to be an anti-piracy safeguard that verifies that the source device and display are authorized to display encrypted content. Your TV and input device have a digital handshake to exchange digital certificates to prove they’re authorized to display the content you’re watching. A handshake failure can result in a blank screen or connectivity issues.

To fix this issue, you’ll need to check the manuals of all your connected devices to see what versions they support. You can also update the firmware on your devices.

Sometimes it’s best to unplug all your devices, then disconnect your HDMI cables and remove any splitters or other devices in the chain. Then turn them on again to see what happens. If all else fails, try a new HDMI cable that supports the latest speed and connect each device independently to see what happens.

Faulty TV port

It happens

A TV’s HDMI port can develop faults that cause connection issues. Physical damage can occur when cables are frequently connected and disconnected from the port or put weight on it from a certain angle. The internal soldering then breaks due to stress, and you might see damaged pins in the port.

It’s best to connect your devices to other ports to see what happens. If they work on the other ports, you’ll know the device and cable are fine. Then test another working device and cable on the suspect port to see if there’s any difference. The port has a fault if nothing you connect works on it.

Repairing a damaged HDMI port is usually unfeasible. You can try using an alternative port if it’s free. If you have a shortage of ports, you can try buying an HDMI splitter which can use a working port for multiple devices.