SuperBox No Signal on TV: HDMI Fixes in 3 Steps

Quick answer: When your TV says “No Signal” for the SuperBox input, fix it in three steps: 1) select the correct HDMI input on the TV, 2) reseat or swap the HDMI cable and port, 3) power-cycle both the TV and the SuperBox. If the screen is still black after those steps, test the box on another TV before contacting support.

Applies to: SuperBox S7 Ultra ($449.00, 128GB), S7 Max ($399.00, 64GB) and S7 Pro ($359.00, 32GB) units sold by the official store, running Android 12 with up to 6K video output and covered by a 30-day return window and 1-year warranty.

Step 1 — Select the correct HDMI input

Use the TV remote to open the input or source menu and choose the HDMI port the SuperBox is plugged into. TVs often have several HDMI inputs, and “No Signal” usually means the TV is watching a different one.

Step 2 — Reseat the cable, then try another port

Unplug the HDMI cable from both the SuperBox and the TV, then reconnect it firmly. If the message stays, try a different HDMI port on the TV and, if available, a different HDMI cable. Damaged or loose cables are a common cause of no signal.

Step 3 — Power-cycle the TV and the SuperBox

Turn off the TV and the SuperBox, unplug both from power for about 30 seconds, then reconnect and turn them on in that order. This clears HDMI handshake glitches that can leave a black screen with no signal.

If the box still shows no signal

Connect the SuperBox to another TV that is known to work. If it displays there, the issue is with the first TV or cable. If it shows no signal on any TV, continue with the 9-step troubleshooting guide and contact support with your model and order number.

Limitations

This guide is for HDMI video output issues on the S7 series. Some TVs need specific HDMI settings (such as enhanced/HDMI-CEC behavior) that vary by brand; check your TV manual if the steps above do not help.

Common questions

Why does my TV say No Signal but the SuperBox is on?

Most often the TV is on the wrong input, or the HDMI cable is loose. Follow steps 1 and 2 first.

Can a bad HDMI cable cause no signal?

Yes. Try a different cable before assuming the box is faulty.

What if no HDMI port works?

Test the box on another TV. If it fails everywhere, contact support — purchases from this store are covered by the Refund and Returns Policy.

Related SuperBox pages

• Android SuperBox Not Working? 9-Step Troubleshooting Guide
• SuperBox Remote Not Working? Quick Fixes
• Why Does My SuperBox Keep Losing Wi-Fi?
• SuperBox FAQs

Published: September 7, 2026 · Last updated: September 7, 2026 · Author: SuperBox Support Team