TV says no signal on an HDMI input

Start with the simple path: the source device must be powered on, sending video, and connected to the input shown on the TV. A cable box, game console, streaming player, receiver, and soundbar can each have their own input selection. LG’s no-signal instructions and Samsung’s HDMI guidance both begin by checking that the external device is on and the correct TV source is selected.

1. Use the TV input/source control and select the HDMI port physically connected to the device.

   If the device’s home screen appears, the issue was the selected input.

   If that does not help: If the TV still reports no signal, check the source device’s power indicator and wake it using its own controls.

2. Confirm the connected device is not asleep, paused in a deep standby state, or waiting for a separate power-on step.

   A source that is fully awake should provide a startup screen or signal status when connected properly.

   If that does not help: If it has no power/status indication, follow the source maker’s power troubleshooting rather than changing TV picture settings.

3. If there is a receiver or switch between the device and TV, note the complete chain and select the matching input on each component.

   A TV can be on the right HDMI port while the receiver itself is listening to another source.

   If that does not help: If the chain is confusing, temporarily test the source directly on the TV as described below.

1. Turn off the source and TV if their manuals require it, then reseat the HDMI cable at both ends.

   A firm connection can restore signal detection if a plug was partially seated.

   If that does not help: If the picture remains absent, compare a different TV HDMI port and select that new input.

2. Try a known-good cable that is suitable for the source’s output, leaving the same devices and port otherwise unchanged.

   If the picture returns, the original cable or its connection is suspect; retain the cable label/type for the replacement.

   If that does not help: If a second cable behaves the same, continue to isolate the source and TV rather than buying progressively higher-spec cables without evidence.

3. Connect another known-working HDMI source to the same TV port, or connect the original source directly to another display if available.

   A second source working on that port points toward the original device or its output; multiple sources failing on one port makes that input worth reporting to TV support.

   If that does not help: A single test is not proof of a failed port; note which device, cable, and input combination was tested.

A source can be powered and connected yet send a format the TV does not accept on that input. Check the supported signal timings in the exact TV manual and compare them with the source device’s output. If the problem began after changing resolution, refresh rate, HDR, or a gaming mode, use the source maker’s recovery or low-resolution startup procedure and return to a documented compatible mode. Avoid guessing through advanced output settings while the TV is blank.

1. Check the TV manual for resolutions and refresh rates supported by the selected HDMI port and the source manual for its current output mode.

   A known-supported format can determine whether the missing signal is a compatibility issue.

   If that does not help: If the TV cannot display the current mode, use the source maker’s instructions to select another output while connected to a working screen.

2. If the source offers a safe video-output reset, follow its official instructions and test again.

   If a lower or automatic mode restores the picture, the previous format was not accepted along that signal path.

   If that does not help: If the source remains blank on multiple compatible displays, contact the source manufacturer.

If one source fails while another works through the same port and cable, ask the source maker about its HDMI output. If several sources fail on one TV input but work elsewhere, give TV support that comparison. If the TV menu and built-in apps are normal while HDMI alone says no signal, this is an input/signal-path issue rather than a general black-screen symptom.

• TV model and exact HDMI port used.
• Source device model and whether it is connected directly or through a receiver/switch.
• Cable type and whether another cable changed the result.
• Whether another source works on that port and whether this source works on another display.
• Any recent resolution, refresh-rate, HDR, firmware, or cable change.

• LG TV No Signal Appears on Screen — checked 2026-10-24
• Samsung TV or projector error messages and no signal — checked 2026-10-24
• Samsung TV HDMI ports not working — checked 2026-10-24

Does “No Signal” mean the TV is broken?

No. It can mean the TV is on the wrong input, the source is off, a cable is loose, or the source is sending an unsupported format. Compare another source and input before concluding the TV needs service.

Why does one HDMI port say no signal while another works?

The original port, its settings, or its cable connection may be involved. Note the source and cable tested, then follow the TV maker’s model-specific input troubleshooting.

Can a resolution setting cause HDMI no signal?

Yes, if the connected device sends a mode the TV/input does not support. Check both manuals and use the source manufacturer’s safe output-reset steps.