A1707 PP0V6_SLEEP1_BUCK0 shorted to ground

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  • Win Me
    Member
    • Jan 2021
    • 30
    • France
    #1

    A1707 PP0V6_SLEEP1_BUCK0 shorted to ground

    Hello, I recently acquired an A1707 MacBook Pro that is not booting at all. When the amp meter is on the charging port it doesn't even turn on the amp meter and put the charger in protection mode (I have to unplug the charger from the wall, wait 5 minutes then the charger starts working again). I solved this issue by removing 4 diodes that were each in the 4 USB C circuits for the 4 USB-C Contollers (CD3215). Now my charger is not in protection mode when I plug it in the board. In my troubleshooting of this weird issue I Removed the 4 CD3215 because I thought they were the culpit, or at least one of them. So now I am waiting my new CD3215 from China but wanted to test the rest of the board, see if there are any shorts on main Power rails, etc. And founded a short on PP0V6_SLEEP_BUCK0, I first thought since it is a low voltage line it is juste probably a low resistance to ground line but it is a dead short, 0 Ohm. I injected voltage (0,5V) And the U3900 chip is burning hot... So since I believe this is the touchbar controller and also Touch ID (correct me if I am wrong) I am not sure but is it like on T2 Mac, like the chip is compatible only with this board and any other chip will result in no touch ID?
    Thanks for any help!
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