TVs

TV turns off by itself randomly

Random shutoffs are usually caused by an energy-saving sleep timer, overheating, or a failing power supply. Checking the sleep timer setting solves this more often than people expect.

Difficulty
Moderate
Time
10–20 minutes
DIY cost
$0
Pro cost
$100–$250

Symptoms

  • TV powers down without warning
  • Power light stays on or blinks after shutoff
  • Shutoffs happen more after long viewing sessions
  • TV won't turn back on right away

Likely causes

  • CommonSleep timer or auto-off setting is enabledMany TVs ship with an energy-saving timer that turns the set off after inactivity or after a set number of hours.
  • CommonOverheating from poor ventilationTVs mounted in enclosed cabinets or against a wall can overheat and shut off to protect themselves.
  • PossibleFailing power supply capacitorsCapacitors that swell or leak can cause the power supply to cut out unpredictably, especially as the TV ages.
  • PossibleFaulty power outlet or surge protectorA loose outlet connection or failing surge protector can intermittently cut power.

What to do

  1. Open the TV's settings menu and turn off any sleep timer, eco mode, or auto power-off feature.
  2. Make sure there's at least a few inches of open space around the TV's back vents.
  3. Plug the TV directly into a wall outlet, bypassing any power strip or surge protector, to rule that out.
  4. Feel the back of the TV after a shutoff; if it's very hot, let it cool and improve airflow before testing again.
  5. Note how long the TV runs before shutting off; a consistent time points to overheating or a timer, random timing points to hardware.
  6. Update the TV's firmware, since some shutoff bugs are fixed in software updates.
  7. If shutoffs continue after ruling out settings and heat, a technician should check the power supply board.

Tools and parts

TV power supply boardSearch: “TV power supply board replacement for model”

When to call a pro

If the TV overheats to the touch or shuts off within minutes even with good airflow, have a technician inspect the power supply.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.