USB numeric keyboard malfunctioning on MacBook Pro 2021

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Level 1

12 points

USB numeric keyboard malfunctioning on MacBook Pro 2021

I have an Apple USB numeric keyboard plugged to my MacBook Pro with an original Apple adaptor. And a Wacom tablet plugged to the keyboard.

Tablet works just fine, but the keyboard malfunctions. Sometimes works, sometimes doesn't. When it works, I can use it all day long, with long periods of the laptop sleep. After start up, randomly works or doesn't.

When it does not work, if unplugged for a while, tends to work again.

And works absolutely fine with my old iMac.

Is this a software problem?

Here's what I see on the "About this Mac" right now, Keyboard is connected but not working at all.

USB 3.1 Bus:

Host Controller Driver: AppleT6000USBXHCI

Hub:

Product ID: 0x8442

Vendor ID: 0x0451 (Texas Instruments)

Version: 1.00

Serial Number: 4A0000792852

Speed: Up to 480 Mb/s

Location ID: 0x00100000 / 1

Current Available (mA): 500

Current Required (mA): 0

Extra Operating Current (mA): 0

Composite Device:

Product ID: 0x82ff

Vendor ID: 0x0451 (Texas Instruments)

Version: 2.00

Speed: Up to 480 Mb/s

Location ID: 0x00150000 / 2

Current Available (mA): 500

Current Required (mA): 0

Extra Operating Current (mA): 0

iMac 21.5″, macOS 10.13

Posted on Dec 1, 2022 06:43 PM

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Answer 1

Omar_A1

Community Specialist

Dec 4, 2022 06:25 PM in response to nasiscal

Hello nasiscal,

Thank you for reaching out to Apple Support Communities.

These steps may help:

"If you don't have a Mac with Apple silicon or the T2 chip

Follow these steps on older computers that have neither Apple silicon nor the Apple T2 Security Chip.

Laptop computer

Shut down your Mac.
On your built-in keyboard, press and hold all of these keys:

Shift on the left side of your keyboard
Control on the left side of your keyboard
Option (Alt) on the left side of your keyboard

While holding all three keys, press and hold the power button as well.
Keep holding all four keys for 10 seconds.
Release all keys, then press the power button to turn on your Mac.

If you need help, contact Apple Support. "

More details can be found here: Reset the SMC of your Mac

If the issue persist, can you test with another keyboard? This will help us further isolate the issue.

Cheers!

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Answer 2

ManJor

Community Specialist

Dec 5, 2022 10:03 AM in response to nasiscal

Hi nasiscal,

Thank you for those details.There are a few other steps you can take to isolate this issue a bit more, before leading us to determining there is a hardware issue.

You mention not having another keyboard to test, do you have any other USB accessory that you can test? Does it function successfully?

Is your Mac running the latest macOS available for the model? An update needing to be installed can cause unexpected behaviors such as what you're experiencing.

Check out the steps on how to update your Mac here: Update macOS on Mac - Apple Support

1. From the Apple menu  in the corner of your screen:

Choose System Settings. Then click General in the sidebar, and Software Update on the right.

Or choose System Preferences. Then click Software Update.

2. If Software Update finds new software, click the Update Now or Upgrade Now button to install it.

3. Enter your administrator password, if asked. During installation, your Mac might restart, and you might see a progress bar or blank screen several times.

Regarding your concern about hardware, you can run a diagnostic test on your Mac to rule that out using: Use Apple Diagnostics to test your Mac - Apple Support

If this continues, you may want to reach out to Apple Support for further assistance. Depending on your region, you may be able to reach them here: Get Support

Hope that helps!

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Answer 3

nasiscal Author

Level 1

12 points

Dec 4, 2022 08:54 PM in response to Omar_A1

Hey Omar_A1,

Thanks for your reply. I followed your steps, no result.

Now I tried to plug the keyboard and Wacom to the external screen and got this message:

USB Accessory Needs Power

Connect "CTL-671" to a USB port on this Mac.

Then I plugged the keyboard to the external screen (2021 DELL 4K) and the Wacom to the laptop and seems to work.

If I plug the keyboard to the Laptop (without Wacom) still not working.

I don't have another keyboard to test, but this one works absolutely fine on my former iMac, and also works when plugged to the Dell screen, so I don't think the Keyboard is the issue.

Do you think there's something wrong with the Laptop?

Thanks!

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USB numeric keyboard malfunctioning on MacBook Pro 2021

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