Ipad2 Screen Not Working After Digitizer Panel Replacement

Try a hard reset (hold top and bottom button), sometimes changing the digitiser on this model will cause issues like no touch or no backlight, which is sorted by doing this.

Plug in your old digitiser to check, new one could be faulty considering it is an old part.

Make sure the digitiser cable is not creased too much, and is bent how it should be.

Also check the flap where the digitiser plugs in, to make sure it is present and the cable is fully pushed in.

If it is none of the above, it will be a logic board issue, not really worth repairing on a device this old though, it is better to just replace the whole board if this is the case.