Responder a: Screen cracked only glass replacementYes, you can fix the glass only if the lcd is still working. Go to youtube and search for glass repair on Samsung 2, there is tutorial there.
Responder a: Replacement motherboard for note 2 (t889)go to ebay.com and purchase one there. Ask them to send along the imei sticker too. Update (05/02/2016): Go to ebay.com to get a replacement motherboard. Ask them to send along the imei sticker label so when you replace your motherboard, you have that imei no. to stick on the back.