Do you mean the front panel light or the LED in the CD drive, that scans the CD surface? If the latter, remember in a CD player that is Infra red, so you won't see it with the naked eye. A digital camera might though.
Whhusff
September 2019
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cd players.