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From: jimt@tekig4.TEK.COM (Jim Tallman)
Newsgroups: comp.sys.mac
Subject: Repairing failed video on Mac
Message-ID: <1354@tekig4.TEK.COM>
Date: Thu, 19-Mar-87 14:43:38 EST
Article-I.D.: tekig4.1354
Posted: Thu Mar 19 14:43:38 1987
Date-Received: Sat, 21-Mar-87 08:11:31 EST
Organization: Tektronix Inc., Beaverton, Or.
Lines: 21

My Mac+ video started wiggling on the right side intermittently.
A colleague's went to a horizontal line (the vertical quit).
(Or it could be the other way around; I can't remember on his.)
We opened his and jiggled stuff until we found the connector from the
crt to the video board wasn't connected well.  I believe it's marked
J1.  Wiggling it would make his vertical work and break
depending on where it was held.  We resolder it back in 
and his works fine.  I went home and re-soldered mine.
Both have been working for about two weeks and mine isn't 
showing the intermittent problem.  I'm so thrilled, because I was
worried it would go out during use at some unpredictable time.
It may come back, but it usually came about every day.
So if you're having video problems like the icons "shaking"
you might consider trying re-soldering the same connector before
shelling out the coin for a new board.  It worked for two out of two.

Caution--be sure to have power off.  I unpluged mine.  Could be
dangerous stuff around crts.

My chance to give something back to the net!
regards, jim