820-02020 20v but no boot

[Outofwhack]

No corrosion visible.
Fan full speed when in case with all peripherals attached.

ppbus_aon 12v
pp3v8_aon 1.8v
pp3v3_aon 3.3v
pp5v_aon 5v
pp1v8_aon 1.8v

Presuming your advise might be to do a dfu restore I checked to see if I can get it into DFO mode....
With 2 microswitches wired to board to apply 1.25v to soc_force_dfu and ground pmu_onoff_I I can only get LOCK SYMBOL to appear in AC2 but not DFU

 

[2informaticos]

Press power switch 5-8s, until lock symbol disappears.
Then try to put the machine into DFU.

 

[Outofwhack]

Im able to get the Macbook into DFU mode with the board back in the case.
Unfortunately both revive and restore end up with unknown error 21.

How to go from here?

 

[2informaticos]

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki

 

[Outofwhack]

I tried replacing the SOC ROM from a donor and did see a different failure message.
"Gave up waiting for device to transition from dfu state to dfu state."
But I mostly get error 21.
What does it mean when AC2 presents the image of an open Macbook ? I saw this a few times. Is this a good thing?

Ive never, ever had any success with AC2 after hours of trying. Sick of it.

 

[2informaticos]

All we know about DFU errors is posted on logiwiki page.