How I attack my back!
Deadlifts 5x5 (find a weight i can do 8 times MAX then using that weight for my 5x5) then adding 2kg every week (working great so far)
Bent over barbell rows 3x8
t-Bar Rows or Seated rows,2x8
lat pull downs.front & back, 6-8 reps, 2 sets front, 2 sets back
Machine rows/pulls 3x8
pull ups or machine pull downs wide grip, "again not a clue what its called". or 3 sets pulls ups, up fast slow back down. 3x8
A lot of heavy pulling works awesome for me I way prefer free weights over any machines, lat pull downs work great for building my lats "front and back pull downs", other than the deadlifts I do most sets between 6-10 reps because I'm looking to build more strength, I do All my exercises witha fast pull and a slow release, controlling the weight all the time! I must say Deadlifts are the KING of back exercises for getting that "Thick" look. IMO. Some will find this is a lot, but I find that it is perfect for me. low reps, more exercises!
I do not do all these exercises sometimes, I usually do around 15 sets on average depending on the day

and i only train back once a week!