Toshiba screen black with sound (was flickerering previously)

@musashineturay you have not told us what you have checked not have you told is what exact model number your TV is. . The no video issue can be related to a bad backlight inverter circuitry. A simple check for that would be to 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. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed. You can repair this be repalcing the backlight strips.

If you do not see anything, unplug your set and remove the back cover. Then visually check the boards for any obvious damaged components. Check all the wiring and unplug the wires and plug them back in, make sure they are properly seated. 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. Do that in a darkened room. 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 damaged components. 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 Adicionar imagens a uma pergunta já existente for that so we can see what you see. It is possible that this is either a power board or a T-con board issue.

Post some images of all of your boards with your question. Use this guide Adicionar imagens a uma pergunta já existente for that so we can see what you see.