Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!ogicse!milton!davisson
From: davisson@milton.u.washington.edu (Gordon Davisson)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Flickering SE/30 - I need a Doctor
Message-ID: <18120@milton.u.washington.edu>
Date: 10 Mar 91 07:47:57 GMT
References: <9103080021.AA01201@grus.cs.nps.navy.mil>
Organization: University of Washington, Seattle
Lines: 32

In article <9103080021.AA01201@grus.cs.nps.navy.mil>
steiger@GRUS.CS.NPS.NAVY.MIL (Robert Steigerwald) writes:
>I recently added another 4 Meg of memory to my SE/30 and soon after
>noted that the monitor started to "flicker".  The flickering occurs when 
>the system has been up for a while and is "warm".  To be more specific, I
>get horizontal lines at the top and bottom of the screen that appear and 
>disappear. With each occurrence, the entire screen image jumps 
>slightly.  This anomaly is not fatal but it is annoying.
>
>Common sense tells me that the new memory has nothing to do with the problem,
>i.e. this is either a coincidence or I touched something I wasn't supposed to
>when I had the case open.
>
>Are there any Mac doctors out there who have an idea why this is happening?

I've never seen this problem on an SE\30 before, but I've seen something
like it in other compact Macs.  It may be you have a slightly cracked
solder connection on one of the lower two pins of the yoke connector
(that's the 4-pin connector near the top front of the analog board).
Usually it's the top pin that goes first (and then the whole screen
collapses down to a thin line), but occaisionally the bottom pin goes,
and if the connection is intermittent in just the right way, it can give
the symptoms you describe.

So try resoldering the yoke connector to the analog board.  It can't
hurt (well, unless something goes wrong with the soldering) and it might
solve the problem.

--
Gordon Davisson
Westwind Computing	(206) 632-8141
4518 University Way NE, Suite 313, Seattle WA 98105