MacBook PRO M1 A2338 stuck at 5V

[mon2]

https://repair.wiki/w/MacBook_Pro_A2...w_at_5V_repair


https://m.youtube.com/watch?v=EySbkN3Eh64

[Mabot17]

Ok, next week I'll try to get another Mac to try Apple Configurator 2 and may luck be with me, for now I thank you so much for the precious advice, I know that time is gold, I at least hope that it can be of help to other people with the same technical problems as me, goodbye for now and have a good weekend

[reformatt]

Unfortunately, not all CD3217's are programmed the same. If you have the incorrect one, you will end up with 5V and no boot.

Check iBoff's video at around the 10 minute mark for this in more detail.

https://www.youtube.com/watch?v=CAGn...annel=iBoffRCC

Only sure way is to grab a CD3217 off a donor board.

[Mabot17]

Thank you,this is a very informative video.
I had seen the iboff video on the repair of the 7 Macs a few days ago, but I missed the one on the CD3217 because I didn't yet know what to expect.
Directly from iboff:

seeing more and more MacBooks were dead because of blown USB-C Controller CD3217, as it does affected by several factors explained in this video, and also why the repair will be quite expensive.

Note: Before you asked did we changed the small IC ROM for CD3217, yes we did and nothing changed. Secondly, it doesn't matter between Small Dot CD3217 vs Large Dot CD3217. You just need the right preprogrammed parts.

This sucks…mine was brand new CD3217 texas instruments with little dot(original was big dot),but now i'm starting to believe that it is not an ACE3 preprogrammed model(yes i also read rickmark blog too about cd3217 ACE firmware revisions 1,2,3).

Maybe I'm lucky and the mac is really in DFU mode and I'll try this solution first to make sure. If it goes wrong, I'll start looking for a donor card, thanks for giving me this information, very useful to understand how power management works USB Type-C from Apple, I'll leave you for now, but I'll update you if I make progress, thanks HELLO!

[Mabot17]

A little update,
I tried to revive the Mac using Apple configurator 2, I did various tests but nothing, no DFU screen, nothing at all. Now only the last resort remains, and that is to find an identical chip from a donor board with the same serial code. I have doubts, do you think I will have to replace the pair or will just the faulty chip be enough? Will I also have to flash the ROM with the programmer? Honestly I don't want to go crazy about it, but from the measurements I took the Mac doesn't seem dead, like a fried CPU so it's a real shame,
greetings

Mauro

[mon2]

What is the current status of this box? What is the USB Type C voltage? Current draw? Is the voltage stable or power looping?

Compare the diode values against the following.

[Mabot17]

My Board has a different layout,can't compare diode mode values,but mine seems all good,the problem could be the cd3217 that i have replaced that is a new one and not compatible,the short is gone and now i have 5v and about 190mA on both usb-c ports(stable).