First, a few questions...
- Did the iPad work with the old screen when you first received it?
- Did you order your screen from a reputable supplier or Amazon/eBay?
- When you replaced the screen, did you disconnect the battery like shown on this link?Sostituzione gruppo schermo iPad Air 2 Wi-Fi
If your iPad digitizer did not work when you first received the iPad from your eBay seller, I would send it back and ask for a refund.
As to your replacement part, there are many sketchy suppliers on Amazon and eBay. Some good ones too to be sure but you always have to be wary.
If your iPad worked properly at first, minus a cracked screen, then you did something wrong because 2 bad screens in a row, while possible, is somewhat unlikely unless the supplier is really bad. That brings me to my third question. Did you follow a guide, like the iFixit guide (linked above)? The Air 2 is simpler than the older iPads but there are traps to avoid. Disconnecting the battery is one. If the device is powered when you work on it, you can cause shorts while trying to put the connectors back in place because they don't always line up properly on first try.
Inspect the connector area again with a loupe and look for debris, broken pins or damaged components in the surrounding area. If you don't find anything and your device worked initially, then you may indeed have a logic board problem.
Finally, did you transfer of the sleep/wake sensor? It's not critical but that's what allows the Apple smart screen covers to induce sleep or wake on the iPad. If you are not comfortable doing micro-soldering, you could pass this step but you will never have that functionality again.
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