whistling mac plus

--- SUPRDAVE(a)aol.com wrote: i fear it's probably that infamous cold solder joint issue. i'm looking at a spare mac power supply board; does anyone know any exact locations of common solder joint failures? finally, if i do touch up some contacts with a soldering iron, MUST the high voltage lead be discharged? i'm hoping i can just remove the protective cardboard cover, reheat the solder joints and not even go near the HT lead or tube at all. --- end of quote --- In my experience, the C-shaped ring of joints corresponding to the flyback transformer go bad pretty often. Also, I've re-soldered them before without discharging the high voltage lead, and everything's been okay afterward, but maybe that's just lucky. If you DO discharge it, do NOT ground to the chassis -- I read once that the logic board components are too delicate to share ground with a jolt like that. Use the screw on a wallplate or something instead. Good luck! -- MB