[YamahaFreak]

Ladies and gentlemen, we have a picture!! I feel really dumb...at some point, when I had the set apart, I must have forgotten to reconnect one of the right side buffer ribbons (see second pic)...as soon as I saw this error, I reconnected it and the set fired right up on the next try. (To be clear, this is after replacing the Y-sustain board.) The picture is still really dim to my eyes...maybe it's the picture controls. The bulk of my issues seem to be over! (EDIT: selecting the 'Dynamic' picture preset brightened things up quite a bit.)