Yes, it's possible to change any of those LEDs, but that doesn't mean they'll be standard or even easy to replace. Some of them may be surface mounted. Is it worth possibly damaging your CD-ROM, etc.

If you have read any of What Hi-Fi?’s recent reviews, or checked our best Mini LED TV guide, you will know that we’ve had a repeating problem with many of the sets we’ve tested with the tech recently.