Ok so i have an a1502 and i desoldered programmed and soldered back SPI chip, but it wont boot, soooo i pulled the chip off, checked it, looks good, thought maybe it was bad soldering job so resoldered it, then thought maybe a faulty chip so I programmed a new one and slapped it on, same thing..what i get is when i plug just the mag safe and fan to the board and power it on the fan sputters when it comes on, then starts spinning for a few seconds then stops, then starts again normally...i know this means SOMETHING lol but i am unfortunately a noob If anyone has any ideas that would be great!
Things ive done:
inspected board for missing components
used multimeter to measure surrounding components
changed IC
used a clip to get a clean read from chip while it was soldered on the board.
thanks