820-00165 Liquid damage on u7200, r7202 blown

Have a bad feeling with with this MacBook Air. I have replaced both U7200 and r7200 and no luck. I'm weirdly getting 8.59 on ppbus. I know that this line is sensitive so im going to guess that even that is too high .

Also I had to run a Jumper on pin 17.... Pin 16 looked toasty as well. Looks like there was a short between them which would mean PPBUS went directly into a 5V CPU line...
 

2informaticos

Administrator
Staff member
"r7200"
Not on schematic.
Check both R7201/02.

Check U7200 basic voltages; pins 1, 16, 17.
Do you get correct voltage on the other big coils?
 
sorry yes I meant R7202. Both sides are 8.59V on that.
on r7201 it's 0v on both sides
pin 1 is 0V
Pin 16 0v
pin 17 8.59v of course

also checked R1951 just in case. 0V both sides.

checked all big coils on top. everything is 0V except for L7560 and of course L7130 is 8.59V

I forgot to mention but you probably know anyway. Current state of the MacBook is green/orange light, no fan spin
 
Top