Search guides

Fix a TV that has HDMI switch that will not work

We'll check power, input selection, and cable connections—or tell you when to call a technician.

Troubleshooting · Home electronics
5–15 min
What you'll need
  • TV remote
  • HDMI cables
Step 1 of 7

Quick triage — pick your path

Get started

Choose the option that matches what you see. You can jump straight to that section.

Show full guide

Steps

Goal: Confirm the symptom, check power and inputs, then rule out cable and handshake issues.

  • Confirm the HDMI switch shows no picture or no signal when you switch sources.
  • Good: You have confirmed the symptom. Proceed to Check power and inputs.
  • Bad: The switch works for some sources but not others—may be a specific cable or source.

Check power and inputs

Goal: Confirm the HDMI switch has power and the correct inputs are selected.

  • Confirm the switch has power. Most need USB or wall adapter. Check the LED if present.
  • Use the TV remote to select the HDMI input where the switch output is plugged in.
  • Use the switch button or remote to select the input that matches your source device.
  • Confirm the source device is on and outputting.
  • Good: Power on and inputs correct. The signal appears. Done.
  • Bad: Still no signal—proceed to Check cable connections.

Check cable connections

Goal: Rule out loose or faulty HDMI cables.

  • Unplug all HDMI cables at the switch—output to TV and inputs from sources. Plug them back in firmly.
  • Try a different HDMI port on the TV for the switch output.
  • Try a known-good HDMI cable for the switch output.
  • Good: Cable reseated or replaced. The signal appears. Done.
  • Bad: Still no signal—proceed to Power-cycle.

Power-cycle

Goal: Reset HDMI handshake between switch, TV, and sources.

  • Unplug the switch, TV, and all source devices from power. Wait 30 seconds.
  • Plug the switch in first, then sources, then the TV. Turn on sources first, then the TV.
  • Good: Power-cycle fixes it. The signal appears. Done.
  • Bad: Still no signal—the switch may be faulty. Replace it or call a technician.

When to get help

Call a TV repair technician if:

  • You have checked power, inputs, cables, and power-cycle with a known-good cable and source and the switch still does not work on any input. Replace the switch or have the TV HDMI board checked.

Verification

  • The TV shows a picture from the selected source through the switch.
  • The switch has power (LED on if present).
  • The correct TV input and switch input are selected.
  • All HDMI cables are firmly connected at the switch, TV, and sources.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Power and inputs Confirm switch has power; select correct TV input and switch input.
  2. Cable connections Reseat cables at switch, TV, and sources.
  3. Power-cycle Unplug switch, TV, and sources for 30 seconds; plug back in.
  4. Call a pro Switch does not work on any input after all checks.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Switch model
  • Source devices connected
  • Whether switch has LED or power indicator
  • Steps already tried

Does the HDMI switch have power?

Most switches need USB or wall power.

Check the power cable. Use a wall adapter if the TV USB port does not power the switch when the TV is off. Powered: check TV input. No power: connect power, then test.

Yes No

You can change your answer later.

Connect power and test

Connect power to the switch. Confirm the LED lights. Select the correct TV input and switch input. If signal appears, done. If not, reseat cables and power-cycle.

Done

Is the correct TV input selected?

The TV must show the port where the switch output is plugged in.

Use the TV remote. Select the HDMI input where the switch connects (HDMI 1, HDMI 2, etc.). Correct: check switch input. Wrong: select correct one, then test.

Yes No

You can change your answer later.

Select correct TV input

Select the HDMI input for the switch. Confirm the switch is set to the correct source. If signal appears, done. If not, reseat cables and power-cycle.

Done

Is the switch set to the correct source?

The switch must show the input where your source is connected.

Use the switch button or remote. Select the input that matches your source. Correct: reseat cables. Wrong: select correct input, then test.

Yes No

You can change your answer later.

Select correct switch input

Select the switch input for your source. Confirm the source is on. If signal appears, done. If not, reseat cables and power-cycle.

Done

Reseat cables and power-cycle

Reseat all HDMI cables at the switch, TV, and sources. Try a different cable for the switch output. Power-cycle: unplug switch, TV, and sources for 30 seconds, plug back in. If signal appears, done. If not, the switch may be faulty—replace it or call a technician.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would an HDMI switch not work?
No power to the switch, wrong TV input selected, switch set to wrong source, loose cables, or handshake failure. Power is the most common cause.
Can I fix an HDMI switch that will not work myself?
Yes. Check power, TV input, switch input selection, and cable connections. Power-cycle the switch and devices.
When should I call a technician for an HDMI switch?
If you have checked power, inputs, cables, and power-cycle with a known-good cable and source and the switch still does not work. The switch or TV port may be faulty.

Rate this guide

Was this helpful?

Continue to