A flickering television screen does not automatically mean the TV has failed. The cause may be as simple as a loose HDMI cable, a connected device, an unstable broadcast signal or a picture setting that reacts poorly to changing brightness.
Work through the checks below before booking a repair. The goal is to identify whether the flickering comes from the television itself or from the content, cable, input or device connected to it.
Start by checking where the flickering appears
The most useful first step is to determine whether the problem affects everything displayed by the television or only one source.
Open the TV’s settings menu or home screen and watch it for a minute. Then compare several sources:
- A free-to-air television channel.
- A built-in streaming application.
- An HDMI-connected device.
- Another HDMI input, if available.
- The television’s settings menu or home screen.
If the settings menu also flickers, the problem is more likely to involve the television, its picture settings, software or internal hardware.
If only one HDMI device, application or television channel flickers, investigate that source before assuming the television needs repair.
Restart the television properly
A complete restart can clear temporary software or processing problems that remain after turning the TV off with its remote.
- Turn the television off.
- Disconnect it from the power point.
- Wait approximately two minutes.
- Reconnect the power.
- Turn the television on and test it again.
If the television uses an external media box, streaming device, game console or receiver, restart that device as well.
Check the HDMI cable and connected device
Flickering that appears only while using a particular HDMI device commonly points to the cable, device or selected video settings.
Turn both devices off before disconnecting cables. Then:
- Reconnect the HDMI cable firmly at both ends.
- Inspect the cable and plugs for visible damage.
- Try another HDMI input on the television.
- Test with another known-working HDMI cable.
- Connect the device directly to the TV if it currently passes through a soundbar, receiver or switch.
- Restart the connected device.
If another cable or HDMI input fixes the problem, the television panel itself is unlikely to be responsible.
High-resolution gaming and video modes can require more bandwidth. If flickering begins after enabling 4K, HDR, 120Hz or variable refresh rate, temporarily select a more basic video mode. If the picture becomes stable, check whether the cable and every connected device support the selected format.
Check free-to-air television reception
If flickering or picture breakup appears only on live television channels, check the antenna connection and reception quality.
- Reconnect the antenna cable firmly.
- Inspect accessible antenna leads for damage.
- Compare several channels.
- Check whether another television connected to the same antenna has the same problem.
- Run the television’s channel tuning or signal-information tool if available.
A problem limited to particular channels, especially during poor weather, may be a reception issue rather than a television fault.
Test the picture and brightness settings
Automatic brightness controls and contrast-processing features can sometimes produce visible changes when a scene rapidly shifts between bright and dark content.
Setting names vary by manufacturer, but options worth testing may include:
- Ambient light detection.
- Eco or energy-saving mode.
- Automatic brightness.
- Black adjustment.
- Advanced contrast enhancement.
- Dynamic contrast.
- Motion or clarity processing.
Disable one setting at a time and test the same scene again. Avoid changing several options simultaneously because you will not know which adjustment affected the problem.
You can also test a standard or custom picture mode. If the flickering stops, compare the processing options enabled in the original picture mode.
Update the television software
Manufacturers may release software updates that correct compatibility, application or picture-processing problems.
Connect the television to the internet and open its software-update menu. The exact path varies between brands, but it is normally found under Support, System, Device Preferences or About.
Allow the update to finish without switching off or disconnecting the television. Restart the TV after installation and test the affected source again.
Use the television’s self-diagnosis tools
Some televisions include picture tests or self-diagnosis tools that display a test image generated by the television itself.
If the test image flickers, the connected device and HDMI cable are less likely to be responsible. If the test image remains stable, concentrate on the selected input, application, broadcast signal or connected equipment.
Use a factory reset only as a final software check
A factory reset removes saved picture settings, network details, applications and other preferences. It should therefore be used only after simpler checks and software updates have failed.
Before resetting:
- Record important picture settings.
- Make sure you know your Wi-Fi password.
- Confirm that you can sign back into your streaming services.
- Disconnect unnecessary external devices.
After the reset, test the television before reconnecting every device. Reconnect equipment one item at a time so you can identify whether one device causes the problem to return.
When to stop troubleshooting
Turn the television off and seek professional assistance if you notice:
- A burning smell.
- Smoke, sparking or unusual popping sounds.
- Visible impact, liquid or electrical damage.
- Flickering accompanied by repeated shutdowns.
- Flickering across the home screen, settings menu and every input after completing the safe checks above.
Do not remove the television’s back cover. Internal components can retain dangerous electrical charge even after the TV has been disconnected from power.
If the television is still covered by a manufacturer or retailer warranty, contact the responsible support provider before arranging an independent repair.
Quick checklist
- Check whether the TV menu also flickers.
- Compare built-in apps, live TV and HDMI devices.
- Disconnect the television from power and restart it.
- Reconnect or replace the HDMI cable.
- Try another HDMI input.
- Connect devices directly to the television.
- Test automatic brightness and contrast settings.
- Install available television software updates.
- Run the built-in picture test or self-diagnosis tool.
- Use a factory reset only as the final software step.
Useful official support resources
- Samsung Australia screen-flickering troubleshooting
- Sony Australia guidance for flickering during brightness changes
- Sony Australia television picture troubleshooting
Information checked August 2026. Menu names and available troubleshooting features vary by television manufacturer and model.
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