When replacing the backlight LEDs on an LCD screen, you first have to remove the back of the TV to disconnect the panel. After that, you need to lay it flat on its back in order to remove the screen. With these stands, you can place the TV level on your workbench without damaging the boards.

This type of stand is also commercially available: https://s.click.aliexpress.com/e/_c2yJrmwP. The advantage of my version over the commercially available ones is the lower price, greater sturdiness, and the fact that the height is adjustable.

There is a window and markings on the base so you can easily match the height across multiple stands.
 

At least four stands are needed for one TV. You also need four 20 mm circular magnets with a hole, like these: https://s.click.aliexpress.com/e/_c3n8CbWL or on amazon https://amzn.to/49gdt04, and four M4 up to 15mm long wood screws.