Backlight works, no image

I just replaced the cracked screen on an iPod i bought on ebay but I can’t get anything to display on iTunes. The backlight turns on but no image appears, the same thing happens when I reconnect the old screen onto the iPod. Any ideas on what the issue could be?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0