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From: patm@omepd (Pat Mead)
Newsgroups: comp.misc,comp.sys.mac
Subject: Re: Leaving a Mac on 24hrs (power supply)
Message-ID: <983@omepd>
Date: Tue, 25-Aug-87 12:06:23 EDT
Article-I.D.: omepd.983
Posted: Tue Aug 25 12:06:23 1987
Date-Received: Fri, 28-Aug-87 00:48:48 EDT
References: <5180@ihlpa.ATT.COM> <135@stech.UUCP> <6014@ut-ngp.UUCP>
Reply-To: patm@omepd.UUCP (Pat Mead)
Organization: Intel Corp., Hillsboro
Lines: 37
Summary: Bad solder joints
Xref: mnetor comp.misc:1107 comp.sys.mac:6018

In article <6014@ut-ngp.UUCP> wmartin@ngp.UUCP (Wiley Sanders) writes:
>
>   Not normal but not unusual. Judging from the traffic on this newsgroup,
>a _lot_ of Macs have failed this way. Also, I don't think there is any
>adjustment that can be made that will get rid of the twitching screen.
>You just have to wait until it fails completely or else is so bad you
>can't stand it any more, then gat another board. I know
>from experience; I've had two fail in
>the last three years and my third is on the way...
>

I have seen this happen in many cases also but in my and others cases it could
be stopped without a analog board replacement. In most cases (not all but most)
the reason for this is that the solder joints on the connector that you plug
the wires from the logic board into get cracked and no longer make a proper 
connection. The prime first sign of this is video problems that go away when
the mac warms up (the metal expands with heat and good contact is made). This
will get worse until it looks like your lost your analog board. A new board
will take care of the problem but so will re-soldering your connections. While
your at it also check the solder joints on the flyback transformer and all
other solder joints. If you see little cracks in the solder or bad solder
joints re-solder them or have someone you know can solder do it for you. I know
from mine and others experince that this works. My original 3 year old mac is
still going strong on it's original analog board. 

If your mac is having problems with the analog board try this before spending
the bucks on a new board. If it fails then you lost nothing in trying but if
this is your problem (and it most likely will be) you saved money and the hassle
of taking your mac in for repairs. 


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usual disclaimers---	

Patrick Mead			ogcvax!inteloa!omepd!patm

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