whistling mac plus

From: SUPRDAVE_at_aol.com <(SUPRDAVE_at_aol.com)>
Date: Tue Oct 20 21:50:26 1998

i'm putting together a mac+ for someone and while testing it, i noticed it
started clicking inside. then later, the machine started making a high pitched
whistling noise, almost kinda like what you hear when you're close to the back
of a tv while it's on. the video worked fine however. i presume it's a power
supply problem, but can anyone say what component is failing here? smacking
the left side of the case would make the whistling quit, although the clicking
continued. 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.

david
Received on Tue Oct 20 1998 - 21:50:26 BST