Path: utzoo!mnetor!tmsoft!torsqnt!jarvis.csri.toronto.edu!rutgers!ucsd!usc!samsung!aplcen!haven!umd5!steveg
From: steveg@umd5.umd.edu (Steve Bruce Green)
Newsgroups: comp.sys.mac.hardware
Subject: Re: screen flickers on a plus
Message-ID: <5641@umd5.umd.edu>
Date: 17 Nov 89 23:11:58 GMT
References: <4963@elroy.uh.edu>
Reply-To: steveg@umd5.umd.edu (Steve Bruce Green)
Organization: University of Maryland, College Park
Lines: 16

In article <4963@elroy.uh.edu> CHEE77@elroy.uh.edu (Fred Schulz) writes:
>What would cause the screen to flicker on and off. After my plus has
>been on for a while, tapping the sid will cause the screen to go off, or
>on. I sure don't want to take it to a dealer to have the analog board
>replaced. I've heard mention of a cracked solder joint, but saw no
>obvious suspects when I opened it up.
>
This is caused from the degradation of some of the solder joints on the power
board.  The usual place too look is along the connectors.  If you can, open the
mac and look at the solder joints along the large connector and along the 4 pin
connector at the top.  (This one is probably under the tape)  You should try to
remove the old solder with a solder sucker if you can.  Simply re-do the solder
joints that are bad and make sure that the solder flows... dont "paint" the
solder on.  In your case, the bad joint is probably on the large connector at
the white wire location. 
When you are done...and things work ok... get a fan!!!