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
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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Hi everyone,
I have a MacBook Pro A1989 that was likely exposed to liquid. It doesn't display an image on the built-in screen, but the screen is backlit (you can't see the Apple logo or any other elements when held up to light). The laptop provides 20V and 1.5-2A, and it works fine when I use it with an external monitor. Currently, the connector for the display (J8500) is disconnected. I'm writing to ask for help in diagnosing the issue. I've heard that when the J8500 is exposed to liquid, the processor pin responsible for the display might short-circuit, and I'd like to know... -
Hey everyone,
I bought a MacBook A1990 with no screen. I bought it knowing the motherboard was defective but wasn't sure what the problem was until I received it. It actually turns on but as you see from the attachment, it has vertical stripes, on an external screen!!
The board is neat. Not opened before for sure. Just a little dust, nothing more.
Recovery using wifi can be opened, as can also be seen in the photo but it doesn't go all the way through after connecting it to a wifi. It downloads the initial Recovery files but never completes the rest of the... -
Hi,
I am working on a MacBook that came in for a screen replacement. The MacBook powers on and works on the external screen. However, the screen stays black. The replacement screen made no difference. On further investigation, I found small amounts of corrosion.
Please see the attached image.
I ordered a refurbished logicboard, but the problem didn't go away with the old or replacement screen.
Can anyone suggest where to go from here?... -
1. RESET MACOS WITH IPSW
a. Power off MacBook, press and hold the power button to enter Recovery
b. Open Disk Utility, remove Macintosh HD
c. Reboot, connect to the network to Activate Mac.
d. Plug the C cord in the first port of the MacBook into the other Mac, then power off the MacBook
d. Hold down the Control (L) + Option (L) + Shift (R) + Power key combination for 10 seconds
e. Release the other keys, but keep holding the Power key for another 10 seconds
f. MacBook is returned to DFU, open Apple Configurator 2 on the other Mac, right-click... -
I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
- PPBUS_G3H (12.6V-12.8V)
- This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
- PP3V42_G3H (3.42V)
- This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
- PPVRTC_G3H (3.3V)
- This
- PPBUS_G3H (12.6V-12.8V)
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