I had my Samsung Note 4 seize up, and checked with various centers in Ottawa for repair costs. Estimates about $150-$350. I checked with Allo Allo Wireless, and they knew right away that the unit would need a new logic board, and maybe a battery. Board would cost $100, and take 1 day to repair.
When I got the unit, the price was even lower than quoted, with no need for a new battery. These guys are straight shooters, low-key but know their stuff. I rate them a solid A. Recommended!!!