1. Check whether the TV power supply is normal. Try unplugging the power, wait a while, plug it in again, and then restart the TV to see if it can solve the problem.
2. Check whether the TV backboard is damaged. You can gently stir the back of the TV by hand to see if there is any noise. If yes, it means that the TV back panel may be damaged and needs to be replaced.
3. Check whether the internal components of the TV are normal. You can try to disassemble the TV casing and check whether the internal circuit board is damaged. If any damaged parts are found, they need to be replaced as soon as possible.