hello Daniel,
firstly, remove a screen, unplug power from electronics, according to your knowledge and experience find and fix a problem. Finally put and glue a screen back and enjoy your repaired iPad. This is of course a schematic in a nutshell. Nothing is impossible! Start reading and learning. There is no other way. Nobody will do it for you remotely (for free).
Start by opening your iPad, buy an electronic meter for $ 5. Try to find out how it should work. You will quickly find out why it does not work. Fixing electronics is not like saying "do this and then this". There are too many variables that depend on one another.
Finally, it would be good to know something about the patient: it fell, poured water, stopped turning on for no reason etc.