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In my case I solved it with a new battery, but the defect, I'm sure concerns the mosfets of the CPU, it seems the same defect of an A1398.

The MacBook is detected in target disk mode, I assume that the ssd must be good otherwise they wouldn't even show it to me, the only thing is that I can't do the installation in recovery because it crashes and restarts, the recovery in dfu mode stops without showing errors, honestly I don't know...

In target mode it is not detected I don't think there is an operating system installed

I tried to restore the dfu, it completes the operation without displaying errors but entering the recovery and trying to install the system it restarts and returns to the question mark

I have this MacBook that has a question mark at startup as if there was no operating system I enter the recovery but if I start the installation freezes and restarts if I try to enter the disk utility it crashes and restarts at the question mark, where should I start?

The readings around U8100 were normal, in the end I decided to replace it, the machine started working again

I noticed a temperature increase below U8100

Exact

I have this card blocked at 5v 0.20A-0.25A PPBUS =10v unstable 3v8 aon =3.7 stable I don't get 3.3 LDO the liquid damage affects the MagSafe side, I solved a short on the ic that manages the audio jack 3v8 aon in diode mode and 0.56

So, after checking all the resistors around UG400, I found RG012 at 74k instead of 100, I replaced the resistor and now I get PPDCIN, trying to put F5201 and F5200 back together by connecting MAGSAFE on usbc related to UG400, it goes into continuous on off, PP3v8_AON turns on and off, same...

On C5250 I have no voltage, this only if powered by the relative USB port UG400, Instead if I feed from the USB port related to UF400/500 I get 12.25 on C5250. On UG400 I have the following situation: PP3v3_UPC2_LDO 3.4v PP1v5_UPC2_LDO_core 1.5v PPVBUS_USBC2 5v PPDCIN_aon 0v

I have no voltage this only if I power from ug400 while from while from UF400/500 I get 12.25, on UG400 I get PP3v3_UPC2_LDO PP1v5_UPC2_LDO_core PPVBUS_USBC2 5v PPDCIN_aon 0v

I brought everything back to the initial situation, they were UF015 and UF115 which were not in good condition, then I replaced UG260 taken from the donor board and now the USBC port relating to UG400 is stable on 5v and 0.003 PPBUS and at 1.5 and I don't have the 3v8 AON

Yes I put them in the same position I compared the readings ldo the diode mode with a working card and it's regular, I even reassembled the replaced cd3217 on another card and it works normally

I tried to replace all cd3217 with a good board but now all the usbc ports turn on and off, before only UG400 did it, 3V8 AON IN DIODE MODE AND 0.160 LDO OBVIOUSLY TURN ON AND OFF

then the usbc port related to ug400 restarts continuously, in diode mode on 3v8_aon I have 0.060 this after removing cg010

Unfortunately I don't have a similar model, I have another working card but blocked on the way to make comparisons, However I suspect it could be the spi rom of the usb c ports

exactly but when I connect magsafe to the usbc corresponding to JG600 it restarts continuously and rises up to 12.25, while with the magsafe connected to the usbc corresponding to UF400 and UF500 instead it lowers up to 1.5v

on C5250 I get 12.25

Yes I'm powering the card from the USB ports