Did you ever find a mother board for you Sony HCD-S800? I think I also need the same part, what were your symptoms? I am unable to read CD's or DVD with the message no disk, I also have a very fuzzy splash screen (The main screen has many lines almost like it is outputting NTSC rather than PAL. I am suspecting the main boards as I have already replaced the laser. If you did find one could you let me know where I could get hold of one? Many thanks, Stewart