For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
First thing is to measure all the LDO's from the CD32s. Make sure none are missing. Also measure in diode mode of all LDO lines (power off) of CD32s. check if there is no odd readings.
Then follow the start-up sequence to ascertain how far the board boots. This is good to understand how these...
If seen a lot of this in the past few weeks. wasted countless hours experimenting swapping parts from known good boards. (CD32s)
A lot of the time a see cycling at PMU_SYS_ALIVE @ 0.4V 1.2hz following the start-up sequence. At this point I put these all down to failure of T2 chip.
I tried multiple cables, different computers. USB A, USB C. Literally everything at my disposal.
intresting that it cycles through the startup sequece during the DFU restore process. But something causes it to fail.
Also worth noting the smallest liquid damage kills these things for good.
This is probabily anotheer T2 or SSD failure.
Mac is stock on 20V 0.3A.
Its stuck in recovery mode in Apple configurator 2. It begins installing the system using system restore. The outputs
"failed to recive message from device, might be a connection problem with usb host)...
There was some liquid damge, thats all fixed.
The board trys to boot, vcore comes on for about 1 sec, and then it reboots again.
Similar to when their is some sort of bios damage in earier series of boards.
The battery when connected loads PPBUS down to about 10V, however amp meter shows...