How to Fix a Blinking Light on a Big-Screen Mitsubishi TV

By Marshal M. Rosenthal

Big-screen televisions need clear ventilation grills to draw heat away from the inside of the set to prevent the electronics from being damaged. A blocked grill can cause the TV to function erratically, and a blinking light will display on the front panel to indicate the set is overheating. A few supplies will be needed to troubleshoot the problem, but the Mitsubishi will not have to be opened or modified in any way.

Things You'll Need

  • Computer vacuum
  • Lint free cloths
  • Compressed air

Step 1

Turn the Mitsubishi TV off with the remote. Unplug the power cord from the wall outlet. Let the TV cool for an hour before proceeding.

Step 2

Remove any obstructions that have been placed against the ventilation grills that are on the sides of the TV. Pull the TV out from the wall so that there is at least 10 inches of space from the back of the TV to the wall. The ventilation grills on the top back or bottom back of the TV will no longer be against the wall.

Step 3

Place the mouth of the computer vacuum against one of the ventilation grills. Turn the vacuum on. Move the vacuum across the length of the grill, as well as up and down the height of the grill, to remove clumps of dust and other contaminants. Repeat this procedure with every grill on the TV.

Step 4

Wipe off the top and bottom of the slots in the ventilation grills with a clean edge of a lint-free cloth. Continue wiping until all of the dust that has gathered on the slots has been removed. Wipe the area surrounding the grills with a clean, lint-free cloth.

Step 5

Blow off the grills with bursts of compressed air. Plug the power cord of the TV back into the wall socket.