Occasionally (about 1 sec), the first possible cause is the signal source.

If the signal source input is interrupted and no signal is displayed, the display screen will of course be black. So check your signal input first.

If the signal input is continuous and normal, the black screen is the problem of the screen.

After the signal is input, the screen display is controlled by the drive circuit, and the failure of the drive circuit will also lead to no signal display. This kind of problem, it is recommended to find a manufacturer to solve.