I printed my PhD thesis and one of the image graphics came out as a black square and I sent copies yesterday to the reviewrs
These things can happen with printing services. This is why you always get a test print, which you check thoroughly. You did get that, right? And you did check it, right? If so, then you probably have a good case against the printing service, to get them to print replacement copies free of charge.
But this does not help you right now. Yes, it will be an issue for the committee if several figures in your thesis are not legible. What you can do is to write an email to your committee members explaining the situation. Attach a pdf of your thesis - which you have double checked to be correct - and promise to send them replacement copies once they arrive.
And before you send the replacement copies, you make damn sure that all the graphics display as it should.