Few things are more frustrating than seeing "No signal" or a black screen when you just want to watch something. Modern HDMI chains are sensitive to cables, ports, and even the order you power things on. This guide helps you walk through a structured set of checks so your Onkyo receiver can see the source again.
Quick answer
- Check correct input — Verify your TV and receiver are on the right HDMI input
- Try direct connection — Connect source directly to TV, bypassing the receiver temporarily
- Use highest-bandwidth port — Move to HDMI ports labeled "2.1," "4K 120," or "eARC"
- Power cycle everything — Unplug all devices for 30 seconds, then power on in order: TV first, receiver second, source last
- Test with certified Ultra High Speed HDMI cable — Many "no signal" issues are marginal cables failing at 4K
Symptoms
- TV displays "No signal" message when switching to receiver input
- Black screen with audio working normally through receiver
- Picture worked yesterday but fails today at same resolution
- 4K or HDR content shows no picture, but 1080p works fine
- Intermittent signal drops during video playback
Quick checks
- Confirm the correct input — Double-check that your TV and Onkyo receiver are on the HDMI input where the source is actually connected. It's very easy to bump the input button to the wrong port.
- Inspect the HDMI cable — Look for sharp bends, kinks, or loose connectors. Try reseating both ends until they click into place.
- Test another HDMI source or display — If you can, plug a known-working device (like a streaming stick) into the same port, or plug your source into a different TV. This quickly tells you which side is misbehaving.
- Restart everything — Power off the TV, the source device, and any receiver in between. Unplug them for 30 seconds before turning them back on.
Step-by-step fix
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Start with a direct connection — If you normally run through a receiver or soundbar, temporarily connect the source straight to the TV with a short HDMI cable. This removes one variable while you troubleshoot.
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Use the highest-bandwidth port — Many TVs only support full 4K or 4K120 on one or two HDMI inputs. Check your manual for labels like "HDMI 2.1," "4K 120," or "eARC," and move the cable there.
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Match resolution and refresh rate — Set the source to a conservative resolution first—try 1080p or 4K at 60 Hz. Once you see a picture, you can step back up to higher frame rates.
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Disable advanced features temporarily — Turn off VRR, ALLM, and deep color modes while testing. These features sometimes cause handshakes to fail until the basics are stable.
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Power on in a clean order — Turn on the TV first and let it reach the home screen. Then power on the receiver (if used), and finally the source. Some combinations really do depend on power-up order.
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Try a different HDMI cable — A surprising number of no-signal problems end up being a marginal HDMI cable that only fails at 4K or at higher frame rates. Swapping to a short, certified Ultra High Speed HDMI cable is one of the fastest ways to tell whether you're chasing a wiring problem or a device issue.
If it still isn't working
After verifying cables, ports, and basic resolution settings, persistent "No signal" or black-screen behavior usually points to a failing port or a deeper compatibility issue. Document which combinations of source, port, and cable work or fail. Having that matrix ready makes support with Onkyo or your TV manufacturer far more effective and can help justify a warranty repair or replacement when simple fixes are exhausted.
When to suspect specific components:
- Source device problem — If the TV shows "No signal" no matter which port you try, but other devices work fine in the same port, the console or streamer may be at fault.
- TV problem — If multiple inputs intermittently lose signal for every device, check for a TV firmware update and consider a full factory reset after backing up your picture settings.
- Receiver or switch problem — If things only fail when a receiver or HDMI switch is in the chain, connect the source directly to the TV. If that works, review the receiver's video pass-through and 4K/8K settings.
FAQ
Why does my picture work at 1080p but not 4K? Your HDMI cable likely isn't rated for the higher bandwidth that 4K requires. Try a certified Ultra High Speed HDMI cable, or check if you're using a non-4K HDMI port on your TV.
Does power-on order really matter for HDMI? Yes, especially with 4K and HDR content. Many devices need to "handshake" and negotiate capabilities when they first connect. Powering on the TV first, then receiver, then source gives each device time to properly detect what's connected.
My console worked yesterday but shows no signal today. What changed? Game consoles sometimes auto-detect and switch to higher resolutions or refresh rates based on what they think your display supports. Try resetting the console's video output to 1080p, then gradually increase the settings.
Can a bad HDMI port look like a cable problem? Absolutely. If swapping cables doesn't help, try different HDMI inputs on both your TV and receiver. Ports can fail partially, working fine at lower resolutions but failing at 4K or HDR.