Is my brother’s Xbox broken?

I know that if three sectors on an Xbox are red then it’s broken and if all four are red then something’s just not connected right. Well, at first I thought that all four sectors were red, so I disconnected and reconnected everything on it. But that didn’t change anything, so I looked at the sectors again, and now I can’t tell if three or four are red. The whole circle is red, but separately, the first, third, and fourth sectors are brighter than the second one. Does that matter?