Why is my webcam not being detected in MacOS?

For the past few months, my webcam has not been working and about two months ago I took it to Apple with several issues, only quoted for the webcam and that was over $500 and I wouldn't like to pay for that for it as I could also buy another MacBook with that money so is there any way I could somehow get it to be detected and usable again? There is no physical damage to the front or back of the lid that I can see. Is it a repair I would be able to do myself? Any help is very much appreciated!