Why My Toshiba Tv Was Blank And Bling With Every 5 Second But Still H Toshiba Television

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My Toshiba TV was blank and bling with every 5 second, but still have a sound and when torchlight on it also have a picture but just dark. Update (11/10/2022) I’m sorry, it’s 40L2400VM Update (11/10/2022) sometimes the light was coming back as usual and the 2 or 3 days later he blank again