820-3435 1V PPbus

iClub

Member
This mac had short C7131, I replaced it but with no result.
Replaced Q7130, U7100, AND Q7180.
When I removed F7140, there is no voltage on either side.

PP3v4_g3h 3,4; PPbus ~0,92V; PPDCIN 16,65V
 

iClub

Member
1- 0,11V
2- 16,22V
3- 4,32V
9- 0,33V
12- 3,4V
13- 3,4V
14- 3,38V
15- 0,050V
17- ~0,935V
19- 5,043V
20- 5,031V
27- 0,960V
 

2informaticos

Administrator
Staff member
Did you check the trace between R7120 and Q7180?

"2-16,68V
---------------
3- 6,77 V"
Do you know how a MOSFET P-channel works???
Because these readings imply to get same pin 2 voltage into pin 4.
Please check again and be sure to post accurate information.
 
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