Symptoms
- TV shows 'no signal' on that specific HDMI input
- Device works fine when plugged into a different HDMI port
- Cable and device both work elsewhere
- Problem started after moving furniture or cables
Likely causes
- CommonLoose or damaged HDMI cableA cable that isn't fully seated or has a bent connector can cause a no-signal state.
- CommonWrong input selected on the TVTVs can have several HDMI inputs and it's easy to select the wrong one.
- PossibleHDMI-CEC or HDCP handshake failure on that portSome ports handle copy protection differently and can fail intermittently.
- PossibleThat specific HDMI port's hardware has failedPhysical damage or age can cause one port to stop working while others are fine.
- Less commonConnected device itself is the problem, not the portTesting another device in the same port rules this in or out.
What to do
- Unplug and firmly reseat the HDMI cable at both ends, checking for a bent or damaged connector.
- Confirm the TV's input selector is set to the exact HDMI number matching the physical port used.
- Try a different, known-working HDMI cable in the same port.
- Test the same device in a different HDMI port on the TV to isolate whether it's the port or the device.
- Restart both the TV and the connected device with everything unplugged for 30 seconds.
- Check the TV's settings for that HDMI input being disabled or set to a non-standard mode.
- If one specific port never works with any cable or device, that port's hardware has likely failed and needs professional repair.
Tools and parts
HDMI cableSearch: “high speed HDMI cable”
When to call a pro
If one HDMI port consistently fails with multiple cables and devices while others work, take the TV to a repair shop for a port replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.