A television that repeatedly turns off or restarts can make it seem as though a serious hardware failure is developing. However, the cause may be a timer setting, unstable power, an external HDMI device, overheating or a temporary software problem.
Work through the checks below before booking a repair. They will help you identify whether the television itself is responsible or whether something connected to it is causing the problem.
Quick answer
Start by checking sleep timers, automatic power-off settings and energy-saving features. Then disconnect external devices, remove the remote-control batteries temporarily and perform a complete power reset.
If the television continues restarting when connected directly to a known-working power outlet with nothing else attached, it may require professional assessment.
Stop immediately if there are electrical warning signs
Turn the television off, unplug it and arrange professional assistance if you notice:
- A burning smell.
- Smoke, sparks or crackling sounds.
- A damaged, crushed or unusually hot power cord.
- Discolouration around the plug or power outlet.
- Liquid inside or around the television.
- Excessive heat coming from the television.
Do not remove the rear cover or attempt an internal electrical repair. Televisions can contain hazardous voltages even after being unplugged.
1. Note exactly when the television restarts
The timing of the problem can help narrow down the likely cause. Pay attention to whether the television:
- Turns off after the same amount of time.
- Restarts only while using a particular application.
- Turns off when a console, soundbar or streaming device starts.
- Restarts after becoming warm.
- Displays a logo before returning to the home screen.
- Loses all power rather than performing a normal restart.
A predictable shutdown may point to a timer or automatic power setting. A restart associated with one application or external device may indicate a software or HDMI-control problem.
2. Check sleep timers and automatic power settings
Many televisions include settings that automatically turn them off after a certain period. Depending on the manufacturer, these may be called:
- Sleep Timer.
- Auto Power Off.
- No Signal Power Off.
- Idle TV Standby.
- Energy Saving.
- Eco Mode.
- Presence Detection.
Open the television’s settings and temporarily disable these options while testing. The exact menu names vary between brands and models.
If the television turns off at roughly the same time every day, also check whether an automatic schedule has been configured.
3. Perform a complete power reset
A proper power reset can clear temporary software and power-management faults.
- Turn the television off.
- Unplug it from the power outlet.
- Disconnect all HDMI and USB devices.
- Leave the television unplugged for at least 30 to 60 seconds.
- If the television has a physical power button, hold it for approximately 10 seconds while the TV remains unplugged.
- Reconnect the television directly to a known-working wall outlet.
- Turn it on without reconnecting any external devices.
If the television now operates normally, reconnect external devices one at a time until the problem returns.
4. Disconnect HDMI and USB devices
A connected device may send commands that cause the television to turn off, change input or restart. Disconnect:
- Streaming devices.
- Gaming consoles.
- Soundbars and receivers.
- Set-top boxes and recorders.
- Computers.
- USB storage devices.
- HDMI switches and splitters.
Run the television by itself for a reasonable testing period. If the restarting stops, reconnect one device at a time.
Check HDMI-CEC settings
HDMI-CEC allows compatible equipment to control power and inputs across an HDMI connection. Manufacturers use different names for this feature, including Anynet+, Simplink, Bravia Sync and HDMI Control.
Temporarily disable HDMI-CEC in the television settings and test again. A connected device entering standby may otherwise instruct the television to turn off as well.
5. Test without the remote control
A stuck button, damaged remote or another compatible remote in the room can send unintended power commands.
- Remove the batteries from the television remote.
- Check that its power button is not stuck.
- Use the physical controls on the television or its mobile application during testing.
If the problem stops, clean or replace the remote rather than the television.
6. Check the power connection
Inspect the external power connection without opening the television.
- Confirm that the power plug is inserted firmly.
- If the television has a removable power cable, confirm that its connection to the TV is secure.
- Look for cuts, crushing, looseness or heat damage.
- Test the television directly from a known-working wall outlet.
- Temporarily bypass extension leads, smart plugs and powerboards.
Do not continue using a damaged power cord, plug or outlet. Arrange an appropriate replacement or professional electrical inspection.
7. Check ventilation and temperature
A television may protect itself by shutting down if it becomes too hot. Make sure that:
- The ventilation openings are not blocked.
- The television is not pressed tightly against a wall.
- It is not enclosed in a cabinet without airflow.
- It is not positioned above a heater or in direct sunlight.
- Dust has not accumulated around the external vents.
Turn the television off and unplug it before gently cleaning the outside vents with a dry cloth. Do not push objects or liquids into the television.
If the television operates normally when cool but begins restarting after warming up, stop using it and arrange professional assessment.
8. Update the television software
Software updates may correct stability, application and device-compatibility problems. Open the support or system section of the television settings and check for updates.
Keep the television connected to stable power while installing an update. Do not unplug it during the installation process.
If restarting occurs only inside one streaming application, update or reinstall that application where the television allows it. You can also test a different application or free-to-air television to determine whether the issue is limited to one service.
9. Consider a factory reset only after the other checks
A factory reset removes stored settings, accounts, applications and customised picture adjustments. It can help when corrupted settings are causing repeated software problems, but it should not be the first step.
Before resetting:
- Record important picture and sound 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 reinstalling every application and reconnecting every device.
When to book a repair
Professional assessment is sensible when the television:
- Restarts with all external devices disconnected.
- Restarts while connected directly to a known-working outlet.
- Will not remain on long enough to access its settings.
- Turns off after becoming unusually hot.
- Shows warning lights or repeating blink codes.
- Makes clicking, buzzing or crackling sounds.
- Has a damaged power connection.
- Continues restarting after a software update or factory reset.
Check the television’s warranty status before paying for a repair. If it may still be covered, contact the retailer or manufacturer before arranging unauthorised work.
What to tell the technician
Useful information can make diagnosis quicker. Record:
- The television’s brand and exact model number.
- How long it remains on before restarting.
- Whether it displays a logo during the restart.
- Which applications or inputs were being used.
- Which external devices were connected.
- Whether the problem occurs when connected directly to a wall outlet.
- Any warning lights, sounds or error messages.
- Which troubleshooting steps you have already completed.
Quick checklist
- Disable sleep timers and automatic power settings.
- Perform a complete power reset.
- Disconnect every HDMI and USB device.
- Temporarily disable HDMI-CEC.
- Test without batteries in the remote.
- Connect directly to a known-working wall outlet.
- Check external ventilation and heat.
- Install available software updates.
- Use a factory reset only after recording important settings.
Final note
Repeated shutdowns do not automatically mean the television needs replacing. Timer settings, external devices, remote controls, unstable power and software faults can all produce similar symptoms.
Once those causes have been ruled out, persistent restarting with nothing connected is a reasonable sign that professional diagnosis is needed.
Information checked August 2026. Menu names and troubleshooting procedures vary between manufacturers and models. Follow the instructions supplied with your television and stop using it if you notice electrical damage, smoke, unusual heat or burning smells.
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