HDMI No Signal or Black Screen: Fix It by TV Brand and Source Device (2026)

"No Signal" almost never means the cable is dead. It means two devices tried to negotiate a handshake and didn't agree — and the most common reason they didn't agree is that one of them is trying to send more bandwidth than the port is configured to accept.

That's why this problem has a signature: it works at 1080p and fails at 4K HDR, or it worked yesterday and stopped after you plugged in a new console. Work the sequence below in order. The menu paths were verified against manufacturer documentation in July 2026; where a brand doesn't publish something, this guide says so instead of inventing a path.

Quick answer

• Select the exact input the device is on — not "HDMI" generally. A greyed-out device in the input list means the TV sees nothing on that port.
• Power cycle in order: unplug the TV and source for 30 seconds, bring the TV up to its home screen first, then power on the source. This clears a stale handshake and is the single most effective step.
• Turn on the port's enhanced HDMI mode. This is the fix for "4K HDR won't display" — see the per-brand table.
• Try a different HDMI port, and a short Certified Ultra High Speed cable.
• Bypass the receiver — plug the source straight into the TV. It removes half the variables in one move.

Which of the three is broken?

Before changing settings, find out what's actually at fault. This takes two minutes and saves an hour.

If the TV's built-in apps play fine, the panel and the backlight are fine. That narrows things a lot.

Make sure you're in the right guide. A few problems look like this one and aren't:

• A picture that's there but too dark is not a signal problem — it's usually the ambient-light sensor or an HDR mismatch. See why your Roku TV screen is dark, which includes a flashlight test that separates a settings problem from a dead backlight.
• A green or discoloured picture from a console is a colour-space negotiation, not a lost signal — see why your PS5 screen is green.
• No sound but a fine picture is the opposite problem: HDMI ARC/eARC not working.

Step 1: Input, seating, and the source itself

Obvious, and genuinely the most common cause.

1. Select the precise input. HDMI 2 is not HDMI 3. If the device appears greyed out in the input list, the TV is seeing nothing on that port.
2. Reseat both ends until they click. A half-seated connector is a classic "No Signal."
3. Confirm the source is actually awake — not asleep, not in standby, and not set to output to a different port.

Step 2: Power cycle, TV first

Handshake negotiation is order-sensitive. The TV has to be up and presenting its capabilities before the source decides what to send.

1. Unplug both the TV and the source at the wall.
2. Wait 30 seconds — capacitors need time to discharge, which is what clears the stale handshake state.
3. Plug in the TV and bring it up to its home screen.
4. Then power on the source.

Display first, source second. If you've read otherwise, that advice is backwards: the sink has to be present to present its EDID.

The toggle that fixes most 4K HDR failures

If the picture works at 1080p but a 4K HDR source black-screens, this is almost certainly it. Every brand ships a per-port bandwidth toggle, every brand calls it something different, and on most sets it is off by default.

"Standard" means opposite things on different TVs

This one catches people out badly. On a Roku TV, Standard is the good setting — Roku's own description: "Standard – Best for newer devices that support 4K HDR and gaming features." On a Hisense Google TV, Standard is the crippled setting, and Enhanced is the one you want.

So "set it to Standard" and "avoid Standard" are both correct advice — for different TVs. Check which OS you're on before following either.

Related: your TV brand doesn't tell you the OS. Hisense encodes it in the model suffix — G = Google TV, F = Fire TV — and the entire 2026 U6 series is Fire TV. TCL ships Google TV, Roku TV and Fire TV in the US. The HDMI Format setting simply doesn't exist on the Fire TV models.

Four more things worth knowing about this toggle.

It's per-port. LG says so explicitly: "You can specify a different setting for each HDMI port." Setting it on HDMI 1 does nothing for the console on HDMI 3.

The names have changed, and stale names are everywhere. LG's current label is HDMI Deep Color — "HDMI Ultra HD Deep Color" is the old name that lived under Picture, though LG's own US support pages still use it. On Samsung, Input Signal Plus is current and "HDMI UHD Color" is the 2018-and-older name; the parent menu also moved from General to Connection, and Samsung's regional pages still contradict each other on this. Vizio renamed Full UHD Color to HDMI Mode around 2020, so any guide sending you to find "Full UHD Color" is at least six years out of date.

It fails in both directions, which is the part almost everyone gets backwards:

• Off doesn't black-screen you. It silently caps the port. LG documents Off as "Supports 4K@60 Hz (4:2:0)"; Sony's Standard format as "4K 60 Hz 4:2:0, 4K 24 Hz." You keep a picture and quietly lose 4K120, 10-bit and full chroma — which means HDR stops being offered at all, because the TV no longer advertises it. That's why this usually shows up as "my PS5 won't let me pick HDR" rather than a black screen. On a PC specifically, which sends RGB, Samsung documents the fallback as dropping to 4K30.
• On is the setting that black-screens you, if the source or cable can't keep up. LG's warning: "If the connected device does not support this function, it may not work properly. When a screen problem occurs, change the HDMI Deep Color setting to Off." Sony's: "When using Enhanced format, picture and sound may not be output correctly." Roku documents it as a heading: "Blank screen after changing HDMI mode."

That's exactly why the debug sequence is turn it off to get a picture, then back on — the two states fail differently, so which one breaks tells you where the problem is. It also means the widely repeated claim that leaving this setting off causes a black screen is wrong; no manufacturer documents that.

One caution on Vizio and TCL Google TV: the available values differ by model, and TCL doesn't publish them at all. Pick the highest option offered rather than hunting for a specific word.

Step 3: Ports are not interchangeable

On most TVs only some inputs run at full bandwidth, and manufacturers rarely put that on the port itself. Plugging a 4K120 console into a port that tops out at 4K60 produces a black screen that looks exactly like a broken cable.

Two corrections to advice you'll find everywhere:

"Only HDMI 3 and 4 are the fast ports" is a Sony pattern, not a Samsung one. Sony documents it themselves: "4K Enhanced format such as 4K 100p/120p are supported by HDMI 3 or HDMI 4 only." Samsung's lineup is binary — either all four ports do 4K120, or the set is a 60Hz panel that can't do 4K120 on any port. If someone told you to move your console to HDMI 3 on a QN90D, that accomplished nothing.

TCL and Hisense are opposites. TCL puts its fast ports on HDMI 1 and 2 and hangs eARC off HDMI 4. Hisense's U8N does the reverse. There is no cross-brand rule here — read the label.

Also beware the marketing artifact: HDMI 2.1 absorbed 2.0, so an 18 Gbps 4K60 port can legally be advertised as "HDMI 2.1." A spec sheet claiming "four HDMI 2.1 ports" may still only have two that can drive 4K120. Judge by the bandwidth and refresh figures, never the version number.

Step 4: The cable

A cable is a real cause, just a less common one than the internet suggests — and it fails in a specific way: fine at 1080p, "No Signal" at 4K HDR, because that's where the bandwidth demand jumps.

• Use a short Certified Ultra High Speed cable (48 Gbps) for anything 4K120 or 8K. Certified Premium High Speed (18 Gbps) is enough for 4K60 HDR.
• Test point to point — no switches, splitters, extenders or wall plates.
• Long runs fail first. Under about 2 metres removes most doubt.

Note the terminology, because it matters when you're shopping: cables don't have HDMI version numbers. They have speed ratings — Standard, High Speed, Premium High Speed, Certified Ultra High Speed. Packaging that puts a version number on a cable is using a marketing phrase, not a certification tier. Ports do have versions; cables don't. Buy on the speed rating.

Step 5: Take things out of the chain

Every device between the source and the TV is a device that can break the handshake.

• Bypass the receiver. Plug the source straight into the TV. If the picture returns, the receiver or its HDMI board is the problem — see AV receiver ARC/eARC not working. If a receiver can't pass your source's 4K120, you can leave it out of the video path permanently and feed audio back over eARC instead.
• Remove switches, splitters and extenders, even ones that "worked before." They're the most common failure point in a 4K HDR chain.
• Disable CEC to test. It's Anynet+ on Samsung, SimpLink on LG, Bravia Sync on Sony, and plain CEC on TCL, Vizio and Hisense. Devices fighting over the CEC bus can cause inputs to switch or blank at random.

Step 6: Force the source down, then climb back

If the TV shows nothing at all, you can't reach the source's settings to fix them — so drop the source into a mode the TV will definitely accept, get a picture, then raise it.

• PS5 — hold the power button until the second beep (about 7 seconds) to enter Safe Mode, then choose Change Video Output → Change Resolution. Details: PS5 HDMI not working.
• Xbox Series X|S — hold the power button 10 seconds to hard power off, then hold power + eject on boot until you hear two beeps to reach the troubleshooter and reset display settings to 1080p.
• Apple TV — hold Menu/Back + Volume Down on the remote for about 5 seconds to force 720p/1080p output, then set the resolution properly once you can see.
• Nvidia Shield / Fire TV / Roku — power cycle first, then check the resolution setting once you have a picture.

Then walk the resolution back up. If it breaks again at a specific setting, you've found your answer — usually the enhanced HDMI toggle or the port.

Brand notes

LG. The HDMI Deep Color toggle sits under External Devices → HDMI Settings and is per-port. On older sets the option lived under Picture and was called "HDMI ULTRA HD Deep Color." LG's CEC is SIMPLINK, under the same HDMI Settings menu.

Samsung. Input Signal Plus is the toggle; the eARC port is usually HDMI 3. On sets with a One Connect box, every HDMI port is on the box, not the panel — a failing One Connect cable produces exactly this symptom across every input at once, and it's a common failure. The Frame's ports are on the One Connect box too.

Sony. On 2025 sets the item is HDMI signal format/VRR, per input, with Standard format / Enhanced format / Enhanced format (Advanced) — Advanced is the one that unlocks 4K120, and VRR is a separate entry inside the same menu. Older 8K and Android TV models use differently-named variants. Sony is the brand where only HDMI 3 and 4 are full-bandwidth, and HDMI 3 doubles as eARC, so an eARC receiver plus two 4K120 consoles genuinely does not fit.

Vizio. HDMI Mode under Picture → Input Picture Settings. Now branded "VIZIO OS" after the Walmart acquisition, though the menus didn't change. Ignore any guide pointing you at System → Reset & Admin for this — that menu holds the factory reset, the power indicator and the store demo, and nothing to do with colour.

Hisense. On Google TV models the setting is HDMI Format. On 2025 sets Hisense documents it at Settings → Channels & Inputs → External Inputs → HDMI Format, with options that now include Enhanced Pro and Auto alongside Standard and Enhanced — Hisense's own manual warns the list "will vary depending on the model variant." On 2022–2024 sets the manual gives only the quick route: press the gear button while you're on the HDMI input. Either way it's per-input.

The eARC port moved between generations — HDMI 1 on the 2024 U8N, HDMI 3 on the 2025 U8QG. And check the model suffix before following any of this: G is Google TV, F is Fire TV, and Fire TV models use Amazon's setting instead. Hisense's UK and Australian sets often run VIDAA rather than Google TV, with different option names again.

TCL. TCL ships Google TV, Roku TV and Fire TV in the US, and the setting differs on each. On Roku TV it's HDMI mode at Settings → TV Inputs → your input. On Fire TV it's HDMI Input Mode at Settings → Display & Sounds → Picture Settings → your input. On Google TV it's HDMI Mode, and unlike Hisense, TCL labels the options with version numbers rather than Standard/Enhanced — you want HDMI 2.1, or Auto, which on current sets negotiates reliably. TCL doesn't publish the path in any manual, so this guide won't quote an exact string it can't verify; it lives under the Inputs section with the target input selected. TCL's fast ports are HDMI 1 and 2.

Worth knowing if you're searching: almost every "TCL HDMI Mode" guide online is actually Roku TV advice wearing a Google TV label, because TCL's own support articles on the subject are all filed under Roku.

Source device notes

Apple TV. The forced-resolution combo above is the recovery path. If the Apple TV works on one TV and not another, the issue is the TV's port configuration, not the box.

Fire TV. The Fire TV Stick Lite is 1080p only — if you're chasing 4K on one, there's nothing to find. Powering a stick from the TV's USB port is a genuine cause of dropouts; use the supplied wall adapter.

Nintendo Switch 2. The dock is fussy about power. Nintendo's own adapter is model NGN-01, rated 60W (20V/3A). Nintendo does publish a note that "an AC adapter with an output of 54W or more can be used" — but that's a general charging statement, not a dock spec. To activate TV mode the dock needs to negotiate 20V/3A, and sub-60W chargers have been found to charge the console while failing to output any video at all. Also note the original Switch adapter (HAC-002) does not work with the Switch 2 dock. The original Switch outputs 1080p docked and never 4K; the Switch 2 does do 4K60 docked.

AV receiver in the chain. Bypass it first (step 5). Receivers also gate 4K120 behind a per-input signal-format setting that ships defaulted to 4K60 — see the receiver guide.

Projectors. Same sequence, with one addition: projectors often need a moment on their input before they'll lock a signal, and long cable runs to a ceiling mount are exactly where marginal cables fail.

FAQ

Why does it work at 1080p but not 4K? Bandwidth. Either the port's enhanced HDMI mode is off, you're on a port that caps at 4K60, or the cable can't carry it. Work the toggle first — it's free and it's the most common answer.

The TV says "No Signal" but the device is definitely on. Confirm you're on the exact input, then power cycle TV-first. That sequence alone clears most stale handshakes.

Which HDMI port should I use for my console? Depends entirely on the brand — there's no universal rule. Sony: HDMI 3 or 4. TCL: HDMI 1 or 2. Hisense U8N: HDMI 3 or 4. Samsung Neo QLED: any of them. Check the label on your set.

My TV says it has four HDMI 2.1 ports but 4K120 only works on two. HDMI 2.1 absorbed the older spec, so an 18 Gbps 4K60 port can still be marketed as "HDMI 2.1." The version number tells you almost nothing. Look for the bandwidth and refresh figures instead.

Do I need a new cable? Only if you're at 4K120 or 8K on a cable that isn't Certified Ultra High Speed, or the run is long. A cable that handles 1080p and fails at 4K HDR is the classic signature — but check the toggle and the port before you buy anything.

Everything was fine until I bought a new console. The console is asking for more bandwidth than the old setup negotiated. Enhanced HDMI mode on that port, and make sure the port is one of the fast ones.

All my HDMI inputs died at once. If the TV's own apps still work, suspect anything shared across all the ports — on a Samsung with a One Connect box, that's the box or its cable.

Should I turn the enhanced HDMI setting on or off? Both, in that order. Off gets you a picture at reduced quality; On gets you full 4K HDR but black-screens if something in the chain can't keep up. Which one fails tells you where the problem is.

Is my TV broken? Only if multiple inputs fail for every device and the TV's built-in apps also misbehave. If the apps play fine, the panel is fine.

Related guides

• HDMI ARC/eARC not working — no sound from the TV
• AV receiver ARC/eARC not working
• PS5 HDMI not working
• Best HDMI cable for 4K eARC