Sansumg S5 is the stupiest design (for repair) ever.
I have fixed s2,s3,s4, note, note 2 and note 3
All of them, you can get into the logic board from the back without touching the screen assembly.
With the S5, just a simple problem could cost you buying a new lcd assembly.
You must remove the lcd in order to remove the screws for the logic board cover.
I purchased a cracked lcd S5, so I can replace it and sell it. My mistake was I did not did a research on the tear down (thinking it should the same as previous S model.
To make story short, lucky for me, I did a dry test of the entire phone, before glueing on the new lcd assembly.
Because the front camera lens was damaged, cost $5.
If I glued the lcd, it would be 50/50 chance that I would crack the new screen.
So any repair that you need to do on the S5, you will have to consider the risk of breaking the LCD.
I hope Samsung change the design on the S6. Which I doubt it. Because the higher cost of repair means people won't fix them = more new sells