MacPro A1286 820-8250-A DC In extremely low

[iFitzit]

I have an a1286 MacBook pro here for liquid damage. it is my first time posting on the forums, so please forgive any info I leave out.
I was told this model is very similar to the 820-2850, which is the only schematic I could find and everything seems to align up.
I am getting .13-.24V on DC In with a known working DC in board.
PPBUS is measuring .06V
I removed C6905, and the issue still persists.
Pin 1,2,3 of U7000 are 0v
Pin 1 of U6900 is .03V
U6901 Pin 1 is measuring -.05V
Any help is much appreciated!

 

[2informaticos]

First of all, welcome to the forum!

Missing PPDCIN_G3H points to input leakage issue.
Original Apple charger detects it and doesn't supply the power voltage.

Usually solved changing Q7080/85.
Post R7080/81 and R7085/86 values; measured onboard, ohm scale.

 

[protocold]

you said your board is "very similar" to 820-2850. But which board do you actually have?

 

[iFitzit]

you said your board is "very similar" to 820-2850. But which board do you actually have?

Apologies for the late reply. I have the
MacPro A1286 820-8250-A
In every video I have seen on this machine, the schematic chosen was 2850.

 

[iFitzit]

First of all, welcome to the forum!

Missing PPDCIN_G3H points to input leakage issue.
Original Apple charger detects it and doesn't supply the power voltage.

Usually solved changing Q7080/85.
Post R7080/81 and R7085/86 values; measured onboard, ohm scale.

Thanks for the warm welcome!
I am getting an open line on all 4 of these resistors on the ohm scale.

 

[2informaticos]

You should get very close readings to the values marking on schematic.
I said ohm scale thinking on auto-range multimeter.
If you have manual model, choose 1M scale.

 

[iFitzit]

You should get very close readings to the values marking on schematic.
I said ohm scale thinking on auto-range multimeter.
If you have manual model, choose 1M scale.

Ah, I apologize for my noobness. Thanks for clearing that up. On R7086 I am getting .330 (330 KOHM), R7085 is .471 (471 KOHM)
R7080 is .099 (99KOHM) and R7081 is .061 (61KOHM)
This appears to be correct according to the schematic, off by 1 kohm.

 

[2informaticos]

Values look good; but should still be good to change Q7080/85.

Test the board with lab PSU, or fake charger.
Lets see if 3V42_G3H and PPBUS_G3H appear then.
Just in case, check first diode mode to ground at L6995 and L7030.

BTW, write directly into reply box, instead of clicking Reply button.
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