A1990 820-01326-05 stuck 20v strange voltage fluctuations

[2informaticos]

U7701 is not enabled, so no L7701 voltage.
You should get diode mode reading from working 01236 board (L7701 and L8102), for comparison.

 

[Sdogs]

this is a big problem ...... I really don't know where to find it, any other suggestions?
do i try to change u7701?

 

[2informaticos]

Why to change, if doesn't get enable signal?

 

[Sdogs]

I got bogged down .... I don't know how to continue

 

[2informaticos]

Since 2016, Apple sells garbage.
They do whatever possible to make the machines unrepairable.
When still possible to repair, this means good money for the repair man.

 

[Sdogs]

the weird thing is that when I first charged it it seemed to have the right amps draw. I tried to restore DFU.
What can I do now? an ultrasonic wash? Trying to inject tension at some point?
Throw it all away in the trash?
I was hoping it might still have a chance to work ....
I had seen a post similar to mine but I don't know what results it got with the repair, will there be someone who can provide those measurements that I compare?

 

[2informaticos]

You can try to check power on sequence.
Already posted for 01055 and 01598 on the forum.

 

[Sdogs]

what will it be that triggers this instability? unfortunately my skills are not that advanced .... I'm stalled

 

[2informaticos]

You can't expect a miracle when buy such a machine from eBay.
Do you think the owner sold it without trying first to get it working by itself?
If you can't complete DFU process, it will not fully boot.

 

[Sdogs]

yesterday i did some DFU reset attempts, i noticed that during the reset attempts the current draw was about 1.8 amps. Could it mean anything?