Hello, I have this weird issue with an M1 MacBook Pro motherboard number 820-02020 when I plug an USB key or a dongle for external screen, etc it doesn't do anything. I wanted to reset it but it doesn't see any USB Monterrey or Big Sur install key. Even in DFU mode the other computer with Apple configurator doesn't see it. And this apply on both USB-C ports. But the charger works normally. Any ideas?
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Re: M1 MacBook computer doesn't rcognise any USB devices
Hi.
1) The USB Type C charger works ok to charge the laptop so the port is able to negotiate the power delivery contracts using the CCx lines.
2) The review should be with the external conversion hub you are using to interface with the Type C connector to convert to the type A for your USB pen drive (memory stick).
Does this hub work with other laptops ? Maybe it requires an external power supply to function ? -
Re: M1 MacBook computer doesn't rcognise any USB devices
It is not the hub, it works on other M1 machines. And I am using type C USB keys to reinstall MacOS, so I directly plug my keys in the port of the MacOriginally posted by mon2 View PostComment
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Re: M1 MacBook computer doesn't rcognise any USB devices
Do you see USB LED flicker when using the external memory stick ?
Confirm the voltage of the Vbus rail for the USB connector.
Confirm that the paddle board is properly seated onto the main logic board.
After the above, remove all power. Meter in Diode mode.
Red meter lead to ground.
Black meter lead to D+ of the USB connector - post the reading.
Black meter lead to D- of the USB connector - post the reading.
Start with confirming if the USB port is receiving the power from the logic board.Comment
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Re: M1 MacBook computer doesn't rcognise any USB devices
My USB sticks don't have any LED indicators the VBUS rail 0 is 20V and the VBUS 1 is 5V when USB stick pluged inOriginally posted by mon2 View Post
Sorry, what is D- and D+, I don't really understand?Comment
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