Panasonic TV 'No Signal' — Black Screen Input Fix

What it means

'No Signal' on a Panasonic TV means the input the TV is currently watching has nothing coming down the wire — no HDMI source, no antenna feed, no AV signal.
The TV is fine; it just isn't being fed anything to show.
Nine times out of ten the cause is the TV set to the wrong input, a cable not pushed fully home, or — for Freeview and antenna users — a loose aerial connector or a re-tune needed after a transmitter change.

Affected Models

Panasonic Viera LED TVs (TX-... range, 2015 onwards)
Panasonic OLED TVs (HZ, JZ, LZ, MZ series)
Panasonic LED TVs running My Home Screen 4.0, 5.0, 6.0, 7.0
Older Viera plasma sets that show the same on-screen text
Panasonic models sold under regional names like Viera GX, JX, LX

Common Causes

TV is on the wrong input (HDMI 2 selected when source is on HDMI 1)
HDMI cable not fully pushed in at the TV or the source
HDMI cable damaged, kinked, or simply too cheap to handle 4K
Source device is asleep, off, or set to output a resolution the TV can't display
Antenna cable loose at the wall or at the back of the TV
Freeview channels need re-tuning after a transmitter change
Set-top box or PVR powered off, in standby, or unplugged
Power-saving on the TV blanked the input after a few minutes idle

How to Fix It

Check you're on the right input.

Press the Input or AV button on the remote (sometimes labelled Source).
Cycle through HDMI 1, HDMI 2, HDMI 3, AV, and TV until you land on the source you actually want — the cable box, console, Blu-ray, or antenna feed.
'No Signal' on the wrong input is the most common false alarm; pick the right one and the picture comes back.
Power-cycle the source device.

Unplug the source — Sky box, Apple TV, console, soundbar — for 30 seconds, then plug back in.
Many devices stop sending video when they crash or sleep; a clean restart wakes them up.
For HDMI passthrough through a soundbar or AV receiver, restart that too.
Reseat the HDMI cable both ends.

Pull the HDMI cable out of the TV and out of the source.
Push it back in firmly — you should feel it click into place.
HDMI plugs work loose with vibration and being knocked, especially on wall-mounted TVs.
If you're using HDMI through a soundbar or receiver, reseat that link too — both ends.
Try a different HDMI cable.

Cheap or old HDMI cables often can't handle 4K, HDR, or 120Hz signals — the source sends a picture, the TV can't decode it, and you see 'No Signal'.
Swap in a known-good cable rated 'High Speed with Ethernet' (for 1080p) or 'Ultra High Speed' (for 4K HDR).
Branded short cables under 2 m / 6 ft work best.
Check the antenna or aerial cable.

If the missing input is TV / Freeview / DVB, the aerial is the suspect.
Check the cable is firmly screwed into the back of the TV and into the wall socket.
If you're behind a wall socket or splitter, check those connections too.
A pulled or twisted aerial cable kills reception completely; a partly loose one shows weak signal or 'No Signal' on weaker channels.
Re-tune the TV.

Press Menu, go to Setup → Tuning Menu → Auto Setup (the exact path varies by year).
Run a full re-tune.
The TV scans for available channels and rebuilds its list.
This fixes 'No Signal' on Freeview after a UK transmitter retune (the 700 MHz clearance is the main reason older sets need this).
Reset the TV's input list.

On newer Panasonic models, the Input Labelling menu sometimes hides inputs the TV thinks aren't connected.
Go to Setup → Display Settings → Input Labels and make sure none of your HDMI inputs are set to 'Skip' or 'Hidden'.
Toggle them back to visible if needed.

When to Call a Professional

'No Signal' is almost always something you can fix in five minutes — input, cable, or aerial.
Call an aerial installer if you've checked the cable from wall to TV and Freeview channels are still missing or pixelated, since the rooftop antenna or the cable from the loft may need work.
You don't need a TV technician for 'No Signal' — the TV itself isn't broken.

Frequently Asked Questions

Why does my Panasonic TV say 'No Signal' on HDMI but the device is on?

Two most likely reasons: the source is outputting a resolution or HDR mode the TV can't display, or the cable can't carry the signal.
Check the source device's video settings — turn off 4K, HDR, or 120Hz temporarily and switch to 1080p 60Hz to see if the picture comes back.
If it does, the cable or one of the HDMI ports is the limit; swap to a certified Ultra High Speed HDMI cable and try again.
If 'No Signal' continues even at 1080p, swap to a different HDMI port on the TV — sometimes a single port fails while the others stay healthy.