I replaced the digitizer on an iPad mini 3 LTE. Everything worked great. (Parts sourced from reputable retailer; my supplier has a limited lifetime warranty.) The customer picked up the device, and then several hours later called and said the display stopped working. I had this exact issue with an iPhone 6s a few weeks ago. Both devices were thoroughly tested, and worked perfectly when the customer picked them up. With the iPhone, I tried multiple screens, and the display intermittently worked. The customer has not brought the iPad back to me yet, I advised them to try a soft reset, and if that doesn't work, bring it back to the shop tomorrow. The iPhone repair was with an LCD digitizer assembly, the iPad mini was a digitizer only replacement.