Ursprünglicher Beitrag von: zzz ,
THSP is thunderbolt proximity sensor. I have no clue where this is on your board because you gave no information. 11", 13", who knows? I am going to guess 2012 13.3" 820-3209 board. Check Q5520, and R5540, and R5541. Most likely a tin whisker between 1 and 2 of Q5520, or blown resistor R5540 or R5541. Check there.