Notebook display black. Externally ok, display change was not successful?

I lost my notebook (Acer v17 Nitro 4k). After the fall, the display was completely black.

Externally hdmi goes perfectly.

Display is no longer recognized as an indicator. Also no stripes oä. No cracks in the display.

Replacement display has also brought nothing. Cable connections have all been tested for strength.

I do not know how to continue.

Here is my amateur answer…
Is it really stupid to hit the shortcut "Screen off"?

https://praxistipps.chip.de/...ehts_43697

Maybe the fall of the inverter has been damaged? I assume you have exchanged with the same?
And 100% sure that you bought the right and functional display?

It has no inverter, only the old CCFL displays had something like that.