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Fix a TV that has cable that will not work

We'll check input, cable box, coax, HDMI, and power-cycle—or tell you when to call your provider or a technician.

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

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Steps

Goal: Confirm the symptom, check input and cable box, then rule out connections and handshake issues.

Check input and cable box

Goal: Confirm the correct input is selected and the cable box is on.

  • Use the TV remote to select the input where the cable box is connected—HDMI 1, HDMI 2, etc.
  • Confirm the cable box is powered on and not in standby. Wake it with the remote or a button on the box.
  • Good: Correct input selected and cable box is on. The signal appears. Done.
  • Bad: Still no signal—proceed to Check coax and HDMI.

Check coax and HDMI

Goal: Rule out loose coax and faulty HDMI connections.

  • Check the coax cable from the wall is firmly screwed to the CABLE IN port on the cable box.
  • Unplug the HDMI cable at both ends. Plug it back in firmly. Try a different HDMI port on the TV.
  • Try a known-good HDMI cable.
  • Good: Connections are snug. The signal appears. Done.
  • Bad: Still no signal—proceed to Power-cycle.

Power-cycle

Goal: Reset the cable box and power-cycle HDMI handshake.

  • Unplug the TV and the cable box from power. Wait 30 seconds. Plug both back in. Turn on the cable box first, then the TV.
  • Good: Power-cycle fixes the issue. The signal appears. Done.
  • Bad: Still no signal—check for service outage or call your cable provider. Call a TV technician if the cable box works on another TV.

When to get help

Call your cable provider if:

  • The coax is connected, the box is on, and you have power-cycled. They can check signal strength and activation.

Call a TV repair technician if:

  • The cable box works on another TV but not this one, or no HDMI input works on the TV.

Verification

  • The TV shows a picture from the cable box.
  • The correct input is selected.
  • The coax and HDMI cables are firmly connected.
  • The cable box is on and channels tune.

Escalation ladder

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

  1. Input and cable box Select correct input; confirm cable box is on.
  2. Coax and HDMI Check coax from wall; reseat HDMI; try different port and cable.
  3. Power-cycle Unplug TV and cable box for 30 seconds; plug back in.
  4. Service Check provider for outage or activation.
  5. Call a pro Call provider for signal; call TV technician if box works on another TV.

What to capture if you need help

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

  • TV model
  • Cable box model
  • Cable provider
  • Steps already tried

Is the correct input selected?

Wrong input shows no signal even when the cable box is on.

Use the TV remote. Select the input where the cable box is connected—HDMI 1, HDMI 2, etc. Correct input: check cable box is on. Wrong input: select correct one, then test.

Yes No

You can change your answer later.

Select correct input

Select the input that matches your cable box (e.g. HDMI 1). Confirm the cable box is on. If signal appears, done. If not, check coax and HDMI connections.

Done

Is the cable box on and coax connected?

Cable box must be on. Coax from wall must be on CABLE IN.

Check cable box is powered on. Check coax from wall is firmly connected to CABLE IN on the box. On and connected: reseat HDMI, power-cycle. Off or loose: fix those, then test.

Yes No

You can change your answer later.

Turn on box and connect coax

Turn on the cable box. Screw coax firmly to CABLE IN. Power-cycle TV and box. If signal appears, done. If not, call your cable provider.

Done

Reseat HDMI and power-cycle

Unplug HDMI at both ends. Plug back in firmly. Try different port and cable. Power-cycle: unplug TV and cable box for 30 seconds, plug back in. If signal appears, done. If not, call your cable provider—they can check signal and activation.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would cable TV not work?
Wrong input selected, cable box off or sleeping, loose coax or HDMI cable, service outage, or billing issue. Check input, connections, and power-cycle first.
Can I fix cable that will not work myself?
Yes. Check input, cable box power, coax and HDMI connections, and power-cycle. Most cable issues are connection or box-related. Call your provider for service or activation issues.
When should I call a technician?
If you have checked input, connections, and power-cycle and the cable box still shows no signal. Call your cable provider first—they can check signal and activation. For TV hardware issues, call a TV repair technician.

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