i have a yamaha htr 5640,when i set it up for 6 speakers the display shows six speakers but when i say ok the rear center channel speaker goes off the display.the speaker works it just does not show it on the display,is this unit defective?
I am thinking about buying the 5640. Are you enjoying your unit? As for the thread, I think JimC_A is right. These light are "input channels indicators" and only light up if the source is encoded, in your case, in 6.1.