Chosen Solution
When i turn my television on it shows the picture for about 15 seconds and then dims down to nothing but darkness but i can still hear whats on
@bazzdog sounds like your TV has issues with the power board not supplying the voltage for your backlight, your T-con board having failed or your backlight array failing. Unplug your TV and remove the back. Then take a look at all the boards. Check for obvious damaged components like leaking or domed looking capacitors. Check to ensure that all the wires are properly connected. Once you checked that, take some good pictures of your boards and post those with your question. Use this guide Adding images to an existing question for that. It will allow us to see what you see. You will need a multimeter to check the proper voltages so let us know what you find thus far.
i think you have problem with backlight on TV, try this -> turn on the TV and wait for the screen to turn off then take the flashlight and shine on the screen if you see the image it means you have problem with the backlight.
Bumping an old post because this is an ongoing problem with these TV’s. It’s not an isolated hardware failure. The backlight power supply is inadequate and shuts down when running an maximum brightness. This will typically happen in a bright room when the backlight control is set for “Auto Brightness Adjust”. Other than return the TV and never buy anymore Toshiba products, you can try turning the backlight down to 80% (Press and hold the Home button until the screen menu pops up). That will give you a somewhat less bright picture to look at but at least you can see it.
