I am attempting to repair my wife's Macbook Pro (A2251). I know that the RAM is bad and I was initially just getting ready to remove and reball the BGA chips.
Upon initial inspection I realized that it looked like there were two resistors missing on the logic board (highlighted below).
I got the board schematics (attached) and it looks like there should be a resistor there. I am new to looking at these drawings and don't know whether these resistors are configuration dependent or if they are actually missing. In the drawing they are the R2391_3 and R_2391_4 resistors.
I am looking to see:
Upon initial inspection I realized that it looked like there were two resistors missing on the logic board (highlighted below).
I got the board schematics (attached) and it looks like there should be a resistor there. I am new to looking at these drawings and don't know whether these resistors are configuration dependent or if they are actually missing. In the drawing they are the R2391_3 and R_2391_4 resistors.
I am looking to see:
- Should these resistors actually be there?
- What kind of resistors are they? (Not clear to me based on the drawings.... I have dealt with electical drwaings but this format is new to me)