MacBook Camera not working .

Wondering who "they" are ... Seems Macs have firmware rather than Bios. Firmware updates are included in macOS updates. Am no expert, so I could be wrong.

Also wondering in which app(s) you have tried to use the camera before you found it doesn't work. Eg: test with Photo Booth ?

Eg: See "If the camera is not working in FaceTime" in the article below:

If FaceTime isn't working on your Mac - Apple Support

or

Maybe Apple's online article may have some tips:

See: what to do: If the built-in camera isn’t working on your Mac - Apple Support

If needed: MacBook Pro Support website (info. / support / contact options etc.):

There is a "Get Support" link (online chat / phone / email etc.)at the bottom of the webpage: MacBook Pro - Official Apple Support

All the best :-)

I think whoever fixed it broke something, possibly the camera cable or the camera leads in the ribbon cable, and they are trying to shirk their responsibility. MacBooks (at least newer ones) do not have a “BIOS”. If this was an Apple Authorized Service Provider they are responsible for fixing any problems they cause.

I’ll spell a few things out. I’m a former Apple Store Manager. No Apple trained service employee (either Apple Store Genius or Apple Authorized Repair Service) would ever use the term BIOS. Your repair person sounds like a PC repair person and probably got the screen off eBay or direct from Alibaba in China. A genuine Apple part would have no issue and the service person would have installed any required software/firmware, if required. But in my experience, that would be a rare occurrence.

With the 2018+ Macs, many of the parts are paired to the Logic Board now. Which parts are paired vary between models. Even something as simple as a Lid Angle Sensor is now paired to the Logic Board, so swapping a simple Lid Angle Sensor between to laptops won't work. Even an Apple or an AASP will be unable to make it work since the Apple service utility cannot pair some components a second time...the Lid Angle Sensor is one of them...yes you must pay to replace a working Lid Angle Sensor when the Display Assembly is replaced because Apple's service configuration utility cannot re-pair (aka pair again) the original sensor, TouchID is another. My organization has had to pay to replace good working parts because of this....it is not right at all.

Probably what the tech meant was an Apple service configuration utility must be run to pair the new components, but as I have already mentioned this is not possible. That utility will only pair new parts since it requires Apple having the correct part serials numbers on file to ensure the proper part is being paired.

Unfortunately these days, third party repairs are becoming a thing of the past for Apple products. Many times you will end up losing some functionality of the device. Even techs that may perform board level repairs by soldering replacement chips & components onto the board....even this is becoming more difficult since many of the chips needed are not available or cannot be swapped due to the security changes & pairing issues.

And as someone else mentioned, it is possible the tech damaged something or the replacement part had a bad camera or cable. Your beef is with the repair shop not properly advising you on possible consequences of an unofficial repair, or due to their own negligence in damaging the laptop/part, or installing a part that was not fully functional.

Apple is not friendly to the Right to Repair movement although they may make some rudimentary gestures. Some other OEMs are a bit better for allowing third parties to repair their products.

You can always leave Apple product feedback (Apple won't respond) or you can contact Apple corporate to voice your displeasure at the lockout of third party repair centers. Don't expect Apple to care since their focus is elsewhere.

Thank you kindly for your reply, and added info. Grateful to see a community member with with more expertise on this issue than either of us has shared help, or advice.