Default [Q] E975 problem, other Optimus G Versions working in Europe?

Hello! My E975 got broken, it powers on and work but wont charge battery. I gave it to technician and he said that he need to replace motherboard to get phone fully working. Its really hard to find E975 working with cracked screen or smth in low price, so i was searching amercian ebay and their prices are better. Now the problem is if i could use LS970 or AT&T E970 in europe, i think LS970 has wrong band to use it here, but E970 would be ok but this is a little diffirent model - with microsd slot etc. Question is if i can buy LS970 and if it would work or if i could replace E970 screen with E975 one, then what about AT&T simlock?