wyeh@blackhawk.eng.clemson.edu (Daniel Yeh) (05/07/91)
Our news sever has become flakey recently. Sorry if you've seem several postings of this article. My Mac Plus is having problem with its video display. The visible portion of the screen expands when displaying white and shrinks for black. If several large black blocks are drawn across the screen, both sides of the visible area look like wave lines. I suppose this symptom is what Mr. Larry Pina calls it "buckling and blooming" in his book. I followed the procedure described in his book and measured those suspectable capacitors. However, those capacitors seems to be working properly. Does anyone know what could be wrong? BTW, my Mac has 2.5 MB RAM in it. Thanks in advance! Daniel Yeh wyeh@eng.clemson.edu
masticol@athos.rutgers.edu (Steve Masticola) (05/07/91)
My Plus had some display problems, not the kind you're talking about but still annoying. It turned out that whoever assembled the analog circuit board had left L*O*T*S of component leads too long; they bent over and shorted occasionally against adjacent foils. The cure for me was to open up the Mac and trim any lead that looked suspicious. I have no idea whether this will fix your problem, but it's worth doing. #ifdef GRIPE_MODE If it works, it beats the "it needs another analog board" repair style that Apple seems to have adopted. In any case, I had expected better construction in a $1600 (@ the time) machine. #endif - Steve (masticol@cs.rutgers.edu)