回答“Screen is black, But sound still present.What to do?”Most of the smart TV'S comes with blinking (LED) codes, but meaning of these blinking codes differs from manufacturers to manufacturers. Just Google it (manufacturer / brand / model) and you may find the problem. Most probably this problem is related to power supply (bulged capacitor).
回答“Screen is black, But sound still present.What to do?”I am not a qualified electronic engineer but after extensive research in Google and other forums, I can say that this could be a problem of ‘backlight'. This happens due to various reasons. Power supply failure to backlight LEDs. Bad LED or strip and maybe other fault.