Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!emory!ogicse!qiclab!nosun!loop!keithl
From: keithl@loop.uucp (Keith Lofstrom;;;628-3645)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac + Solder Joints
Message-ID: <1991Apr12.155219.4252@loop.uucp>
Date: 12 Apr 91 15:52:19 GMT
References: <1991Apr9.204332.15796@cs.dal.ca>
Distribution: na
Organization: Launch Loop, Portland OR
Lines: 32

In article <1991Apr9.204332.15796@cs.dal.ca> earhard@ug.cs.dal.ca (Mark Earhard) writes:
>I have a Mac plus that seems to be developing the standard old solder joint
>problem:  After about an hour the screen turns off, then by tapping the
>side of the computer, or by squeezing the sides together, he could get it to
>come back on.  Now, however, it is realy bad.
>
>Does anyone know which joints need to be re-done?  I could re-solder them 
>without much problem if I knew where to do it.

It's more than likely connector J1, the 4 pin white Molex connector that
goes to the horizontal deflection yoke off the video/power supply board
on the left side.  When you open up the Mac, you will probably find some
brown char on the board, the connector, or the board cover.  You should 
probably replace the connectors if this is so.

If it isn't that obvious, just go over the video board with a magnifying glass and
look for cracks in the solder.  Also, unplug and reconnect all the connectors.

You may wish to buy the book "Macintosh Repair and Upgrade Secrets" by Larry
Pina, from Hayden Books for $33.  Also, a repair kit to upgrade the commonly
failing components is available for approx $55 from Soft Solutions, Eugene,
OR,  (503) 461-1136.

Lastly, find someone who can install a cooling fan.  It could cut failure rates
in half.

Keep 'em flying!

-- 
Keith Lofstrom  keithl@loop.uucp ...!sun!nosun!loop!keithl (503)628-3645
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Power ICs