TV technician helping fix Sony Bravia HDMI no signal issues

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Sony Bravia & Smart TVs, HDMI/ARC/eARC, PS5 and Xbox, cable boxes & streaming devices, AV receivers, picture & “No signal” issues

Sony Bravia no signal on HDMI input — ports, cables, resolution and device issues

Technician avatar Technician
Hey! We’ll track down why your Sony Bravia shows “No signal” on HDMI and get the picture back. I don’t want to guess, so a few quick questions:
• Exact Sony Bravia model (on the back or in Settings → About)?
• Which devices show no signal on HDMI — cable/satellite box, PS5/Xbox, Apple TV, Fire TV, PC/laptop, Blu-ray, soundbar/AV receiver?
• Does the TV work fine with built-in apps (Netflix, YouTube), and is the error only on HDMI inputs (HDMI 1/2/3/eARC)?
• What exactly do you see: “No signal. Check the external input”, “Unsupported signal. Please check device output”, black screen with sound, or completely blank?
• Did anything change recently — Sony Bravia software update, PS5 firmware update, new soundbar, HDMI splitter, or did you move the TV?
With that info we can decide if this is a simple wrong input / loose HDMI cable situation or a deeper HDMI handshake / port problem.
Customer
It’s a 55″ Sony Bravia from a few years ago. Internal apps work fine. But when I switch to HDMI 1 or HDMI 2, I get “No signal. Check the external input.” or sometimes just a black screen. My cable box and PS5 are both connected. This started right after a Bravia software update last week. I’ve tried different HDMI inputs on the TV and it still says no signal from the device.
Technician avatar Technician
Got it, thanks — classic Sony Bravia HDMI no signal case triggered by an update.
When Bravia software or a connected device updates, a few things can break the HDMI connection:
• The TV may switch to a different input or disable the last used input → you get the “check the external input or select another input” message.
• The update can change the HDMI signal format (Standard vs Enhanced), so your PS5 or cable box sends 4K/HDR that this HDMI port can’t negotiate.
• A bad HDMI “handshake” after the update makes the TV think no device is connected at all.
• Weak or damaged HDMI cable, or a flaky HDMI port, suddenly shows up as soon as 4K or HDR is pushed harder.

We’ll start with simple checks (inputs and cables), then move to HDMI settings on Sony Bravia and device resolution. That usually fixes “Sony TV no signal on HDMI 1” without needing repair.
Customer
I already pressed the INPUT button and tried HDMI 1, HDMI 2, HDMI 3. Sometimes it flashes for a second then goes back to “No signal”. Apps like Netflix still work, so the screen is fine. PS5 and cable box power lights are on. I just don’t understand why HDMI stopped working on my Sony Bravia after the update.
Technician avatar Technician
Totally get it — updates love to break what was working.
Step 1 — Full power reset of TV and HDMI devices
1) Turn the Sony TV off with the remote and unplug it from the wall for 2 full minutes (not just standby). This clears a lot of HDMI handshake issues on Bravia sets.
2) Unplug power from the PS5 and cable box as well.
3) Disconnect HDMI cables from the TV and devices. Inspect both ends for bent pins or wobble.
4) After 2 minutes, plug the TV back in first and power it on.
5) When the TV is fully on, connect only one device (for example the cable box) to HDMI 1 with a known-good cable. Press INPUT and manually select HDMI 1.

If the TV is going to show anything, it usually does after this “fresh start”. If you still see no signal on HDMI input, we’ll test different ports and tweak Sony Bravia HDMI settings next.
Customer
I did the unplug trick and reconnected just the cable box to HDMI 1 with a different cable. Now HDMI 1 shows a picture, but HDMI 2 with the PS5 still says “No signal. Check the external input.” The PS5 works on another TV, so the console is fine. Is this a bad HDMI port on Sony Bravia or some setting?
Technician avatar Technician
Good, that tells us a lot — the TV panel works and at least one HDMI input is OK.
Step 2 — Swap ports and test each HDMI input
1) Move the PS5 HDMI cable into the exact port the cable box was using (HDMI 1).
2) On the TV, select HDMI 1 again. If the PS5 now works on HDMI 1, the problem is likely HDMI 2 no signal (port-specific) or a settings mismatch.

Step 3 — Check Sony Bravia HDMI signal format
1) On the TV remote, press HOME → Settings → Watching TV → External inputs → HDMI signal format (name can vary slightly).
2) For the port your PS5 uses, set it to Enhanced format or Enhanced format (Dolby Vision) if available. Some older devices prefer Standard format, but PS5 and 4K boxes like Enhanced.
3) Turn Bravia Sync (HDMI-CEC) off and back on under External inputs. Sometimes Sony’s HDMI control gets stuck after an update.

This alone often fixes Sony Bravia no signal with PS5 or 4K devices. If HDMI 2 still refuses to show a picture while HDMI 1 is fine, we’ll look at the PS5’s resolution next.
Customer
Swapping the ports helped a bit. The PS5 works on HDMI 1 but not on HDMI 2, and the cable box works on either HDMI 1 or HDMI 2. When the PS5 is on HDMI 2 I just get a black screen and then “Unsupported signal” or “No signal”. I want 4K if possible, but right now I just want to get HDMI working on the Sony TV.
Technician avatar Technician
That error combo screams “resolution/format mismatch” more than physical damage.
Step 4 — Set a safe output resolution on the device
On PS5 / Xbox / PC / streaming box:
• Temporarily force 1080p 60Hz instead of 4K, and disable VRR/120Hz while testing.
• Turn off “RGB Full” / “Deep color output” / “YUV 4:4:4” type options and use a simpler setting first.
• On PS5, go to Settings → Screen and Video → Video Output and set Resolution to 1080p and 4K Transfer Rate to -1 or -2 if you see that option.

Then connect that device to HDMI 2 again and select HDMI 2 on the TV. If you now get a picture, it means the Sony Bravia HDMI port was OK, it just didn’t like the old 4K/HDR settings. Once it’s stable in 1080p you can raise resolution gradually until you find the point where “no signal” returns.
Customer
One more detail: I also have a Sony soundbar on the HDMI ARC/eARC port, and sometimes I daisy-chain devices through the soundbar’s HDMI IN. Since the update, when I go through the soundbar, the TV almost always shows no signal on HDMI, but direct connection to the TV works more often. Could that be part of the problem?
Technician avatar Technician
Yep, that’s important. Soundbars and AV receivers can absolutely cause Sony Bravia HDMI no signal after update because there are now three devices involved in the HDMI handshake.
Step 5 — Bypass the soundbar to test
• Connect the PS5 or cable box directly to an HDMI port on the TV (not through the soundbar).
• If that works 100% of the time, the problem is “in the chain” — usually the soundbar’s firmware or HDMI settings.

Step 6 — Reset ARC/eARC and CEC control
1) On the TV, temporarily turn off eARC and Bravia Sync (HDMI-CEC).
2) Power off and unplug TV, soundbar and source device for 2 minutes.
3) Power on the TV first, then the soundbar, then the source device, and finally re-enable eARC/CEC.

If the TV is stable direct but not through the soundbar, we can rewire so that video goes direct to TV HDMI and only audio returns over ARC. An expert can map this out for your exact Bravia + soundbar model in live chat.
Customer
Is there anything I can change so I don’t keep seeing “No signal. Check the external input.” every few weeks? It feels like every time I move a cable or there’s an update, my Sony TV loses HDMI signal again.
Technician avatar Technician
100%. Let’s “future-proof” things so your Sony Bravia doesn’t keep saying no signal every time something changes.
Preventive setup for Sony Bravia HDMI
• Use short, good-quality HDMI cables, avoid sharp bends and random splitters unless absolutely needed.
• Label devices and ports (HDMI 1 – Cable, HDMI 2 – PS5, HDMI 3 – PC) so you always pick the right TV input source on the remote.
• On Bravia, set each port’s HDMI signal format to what the device actually supports and don’t keep changing it.
• If a firmware update is offered for the TV or soundbar, install it when you have time to test afterwards — not right before a big game or movie.
• After rearranging cables, always do a quick sequence: TV on → select correct HDMI → then power on the device. This minimizes handshake glitches that cause no signal on HDMI messages.
With these in place, HDMI on Sony Bravia is usually rock-solid.
Customer
What if every HDMI input stops working? I saw people saying all HDMI ports died on their Bravia. If I get “No signal” on HDMI 1/2/3 with every device but the apps still work, does that mean the HDMI board is dead and I need a new TV?
Technician avatar Technician
That’s the “worst-case” version of a Sony Bravia no signal on any HDMI input, but we don’t jump straight to “dead TV”.
Before calling it hardware:
• Test 2–3 different external devices (console, laptop, cable box) with different HDMI cables on every port.
• Do a full factory reset of the TV via Settings → System → About → Reset (exact menu varies) and then re-set one HDMI device only.
• Check if the TV still detects something under Settings → External inputs → HDMI control or if it acts as if nothing is plugged in anywhere.

If all that still leaves you with “No signal” on every port while apps are fine, then yes, it’s likely an HDMI board / mainboard fault. At that point we usually weigh the cost of a repair vs. replacement based on your model and size. An expert can look up typical part prices for your exact Bravia model and help you decide if a board swap is worth it, right in chat.
Customer
After the power reset, trying a new cable, setting the port to Enhanced, and dropping the PS5 to 1080p, both the console and cable box work again. No more “No signal” message and my Sony Bravia HDMI inputs are stable. Thanks!
Technician avatar Technician
Summary: when a Sony Bravia shows no signal on HDMI, first reset power on the TV and devices, then confirm the correct HDMI input and try a different cable. Next, adjust each port’s HDMI signal format and set your console or box to a safe resolution like 1080p. Test each HDMI port directly before adding soundbars or receivers back into the chain. If every HDMI input still shows “No signal” with multiple devices, the HDMI board may need service. Not sure which step matches your model? Open the chat and an expert will walk through it one-on-one.

Quick answer: the accepted fix

Accepted fix when a Sony Bravia says “No signal” on HDMI: unplug the TV and HDMI devices from power for 2 minutes, then reconnect one device with a known-good HDMI cable to a single port (for example HDMI 1). Select that input on the remote, set the TV’s HDMI signal format correctly, and force the device to 1080p 60Hz. Once that HDMI input is stable, repeat for other ports and devices, adding soundbars or receivers back in last.

Why Sony Bravia TVs show “No signal” on HDMI

Most Sony Bravia no signal on HDMI problems come down to a few common causes: the TV is on the wrong input, a loose or damaged HDMI cable, a resolution or HDR mode the TV/port can’t handle, or a bad HDMI handshake after a firmware update. Sony updates can also change the HDMI signal format for each port, so a PS5, cable box or streaming stick suddenly triggers “No signal. Check the external input or select another input.” In rarer cases, especially when all HDMI ports on Bravia stop working while apps are fine, the HDMI board or mainboard is faulty and needs service.

How to test if your Sony Bravia HDMI signal is really fixed

After you’ve changed cables and settings, leave the TV on the same HDMI input for a while and watch whether the picture stays stable. Try switching between HDMI 1, HDMI 2, and the home screen a few times. If your Sony TV no longer shows “No signal” when you come back from apps or standby, your handshake issues are likely resolved. Test multiple devices (console, cable box, streaming stick) with the same port so you know the port itself is good. If only one specific port keeps losing signal while the others work, treat it as a failing HDMI port and avoid it, or consider repair if you need all ports.

Sony Bravia “No signal on HDMI” — quick troubleshooting tips

Most HDMI no signal errors are fixed by checking inputs, cables, and signal format.

Quick path: confirm the TV is on the correct HDMI input source, unplug TV and devices from power for 2 minutes, then test one device at a time with a known-good HDMI cable. Set the port’s HDMI signal format appropriately and temporarily force the device to 1080p 60Hz. Bypass soundbars or receivers until the picture is stable directly on the TV. If every external device still reports no HDMI signal on Sony Bravia, you may be looking at a failing HDMI board and should get a repair estimate before deciding on a new TV.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your Sony Bravia model, HDMI devices, and firmware versions, please consult a verified expert on Whizz-Tech before making decisions.

Understand what these prompts mean

Getting Started Is Easy

Ask for help, 24/7

Members enjoy round-the-clock access to 12,000+ verified Experts, including Sony Bravia TV support, smart home techs, mechanics, vets, and more.

Expert will respond in minutes

We match you with an Expert who specialises in Sony Bravia and HDMI issues. Talk, text, or chat — whichever you prefer.

Save time & money

No scheduling hassles or expensive in-home visits. Fixing Sony Bravia HDMI no signal problems online can save you time and money.

FAQ

Why does my Sony Bravia keep saying “No signal. Check the external input”?

This usually means the TV input doesn’t match where your device is plugged in, or the TV isn’t getting a proper HDMI signal. Double-check which HDMI port the device uses, select that exact input with the INPUT button, then reseat or replace the HDMI cable. If the message appears only with one device, it may be sending an unsupported resolution or HDR mode.

How do I fix no signal on HDMI 1 or HDMI 2 on my Sony TV?

Start by unplugging the TV and device from power for 2 minutes, then reconnect with a known-good HDMI cable. Select HDMI 1 or HDMI 2 manually on the remote. In Settings, check the HDMI signal format for that port and try Enhanced or Standard format depending on the device. Finally, set the device to 1080p 60Hz and test again.

Does “No signal on all HDMI inputs” mean my Sony Bravia is broken?

Not always. You should still test multiple devices and cables, and perform a factory reset of the TV. If, after that, every HDMI port still shows “No signal” but built-in apps work, it strongly suggests an HDMI board or mainboard fault. A technician can confirm and quote repair costs versus replacement.

Can a soundbar or receiver cause HDMI no signal on Sony Bravia?

Yes. Daisy-chaining devices through a soundbar or AV receiver adds another HDMI handshake. If the TV works when devices are connected directly but fails through the soundbar, reset ARC/eARC and CEC, update the soundbar firmware, or wire video straight to the TV and use ARC only for audio.

Sources

Matt Verified Icon
Matt ● replies in < 1 min
Technician Expert
⭐⭐⭐⭐⭐ Trusted by 27,000+ customers
Avatar
Alex · Expert's Assistant
5 Tech Support Specialists are online right now.