Why is my screen coming on for a second and then going black
The screen comes on for a minute and then goes black you can still hear sound
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@tamerasjester First you need to verify that you have no image on all inputs. Try all of those. If it remains dark, unplug everything that is plugged in the back of your TV. unplug the TV and push the power button for about one minute, then plug it back in. See if that resets your TV.
If it remains dark, turn the TV to a channel where you can hear the sound. Next, use a flashlight and shine the beam at an angle against the screen. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed. If you do not see anything, unplug your set and remove the back cover. Then visually check the boards for any obvious damage like domed or leaking capacitors. Check all the wiring and unplug the wires and plug them back in, make sure they are properly seated. Post some images of all of your boards with your question. Use this guide Agregar imágenes a una pregunta existente for that so we can see what you see. It is possible that this is either a failed backlight strip (most likely), power board issue or a T-con board (least likely) issue.
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My guess would be that there's a problem with the backlight circuit. The TV powers on the backlight but sees there's something wrong and shuts it back down again.
Check that by holding a flashlight up to the screen. Can you make out a picture? If so, we'll want to look at possibly replacing the backlight strips.
- de Jerry Wheeler