Hi there. I have a HP8563E unit that suddenly lost its display. After scratching around for a while I found a short CCt cap on the A15 board taking out the -15V rail. Once rectified my display came back but the ref level is way too high causing the trace to always be at the very top of the screen. It goes through its boot up ok and then when its finished the trace goes way up high and stays there. Any ideas here? Anyone had this?