Apple does NOT fix iPads, but simply replaces them with refurbished product depending on the length of use of the iPad.
If this is not a new iPad or no longer has any extended AppleCare warranty, Apple will not fix, but simply replace your unit with a refurbished unit.
The cost to you will be 60% of the price of a new matching iPad.
IF your iPad is, relatively, new and STILL has two year AppleCare+ on it, you will only have to pay Apple a low, but nominal fee for a refurbished replacement iPad.
I believe the replacement iPad fee under AppleCare+ is only $49 U.S.D..