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Many similar questions I've read here have to do with backlights not working at all or when dimmed.

My problem is that the number 6 key is not illuminating. All other keys are working as they should.

Any ideas how to diagnose and fix this?

Single key not illuminating

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    Looks like a hardware problem to me. I suggest taking it to an Apple Store or a reputable Apple repair shop if the laptop is under warrantee. – IconDaemon Nov 12 '19 at 16:58
  • support.apple.com/en-us/HT201295 SMC is responsible for Backlighting – ankii Nov 12 '19 at 17:14
  • Let me add that when this happened to two of my clients, SMC resets did nothing to fix the problem. YMMV. – IconDaemon Nov 12 '19 at 17:46
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Unfortunately, unless a SMC reset doesn't work (Shut down -> Press Shift-Control-Option and Power Button at the same time for 10sec -> release keys -> Press power button), it is a hardware problem. If it's under warranty, Apple should fix it, if not, a 3rd party repair shop should be able to fix it for a reasonable price.

  • Thanks. The SMC reset did nothing for this particular issue but has helped in the past. I have 3 years of Applecare+ so I'm going to take it in to them. – Rob T Nov 15 '19 at 14:49

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