820-01521 no 20v, no PP5V_G3S , PPBUS ok

[2informaticos]

"PPVIN_G3H_P5VG3S: 12v3 (OK)"
This is NOK.
Stay away of wrong assumptions!

Do you get all these voltages on all USB-C ports?
Any USB-C port is cycling now?
If all good, then try DFU restore; full info posted on the forum...

 

[Doubleu82]

Both ports behave the same voltage and current wise (both generate the same voltages on the board)

When i plug in the macbook into another macbook with an the Apple charge cable it shows up directly as DFU device (not using the procedure). tried reviving but progress gets stuck at step:4 installing. after a while it times-out. (after debate with the customer, definitely bye bye data) I tried restore. unfortunately it gave the same result.
(also tried the DFU procedure, the DFU device briefly disappears and returns when holding the buttons)

"Gave up waiting for device to transition from DFU state to DFU state. [com.apple.MobileDevice.MobileRestore – 0xFA5 (4005)]"

is there anything else I could check

 

[2informaticos]

Some people complained about type of cable connection.
Sometime got it after many tries.
You should read all the threads you can find about DFU restore and collect information.