[solved]820-2530 missing ALL_SYS_PWRGD

[XooP]

Have an older MacBook Pro with 820-2530.
The board measures fine as far as I can tell, but I don't get ALL_SYS_PWRGD

On U7870 Pin 3, 5 and 6 all measures the correct voltages but Pin 8 is at 0V

I have some difficulties figuring out how the ALL_SYS_PWRGD circuit works, ca anyone enlighten me?

 

[dukefawks]

Pin 8 is tied to 3 more PGOOD outputs. One of them is pulling it low.

 

[XooP]

That's what I was thinking, then I'll just have to figure out how and which one

 

[XooP]

Well, it turned out it was U7500 that caused the problem, replaced it now and all good... Thank you for sending me in the right direction Dukefawks