Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!ncar!elroy.jpl.nasa.gov!sdd.hp.com!spool.mu.edu!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!news.funet.fi!uta!ccjapu
From: ccjapu@uta.fi (Jarmo Puntanen)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Help!  Bad display on old Plus
Message-ID: <2704@kielo.uta.fi>
Date: 3 May 91 05:44:43 GMT
References: <27910@hydra.gatech.EDU>
Organization: University of Tampere, Finland
Lines: 26

In article <27910@hydra.gatech.EDU>, dave@gatech.edu (David K. Codelli) writes:
> 
> A few months ago, someone posted a message saying the display on their Plus had  
> been flickering and sometimes going out altogether.  I've have had trouble of  
> my own recently.  
> 
> First, it would flicker and go out briefly, but if I hit the side it would come  
> back.  Then, it would go black except for one bright vertical white line in the  
> center of the screen.  Lately, I get no display at all, just the line.
> 
> Any help is appreciated
> 
> Thanks in advance,
> 
> David
> 
You have had two independent problems:
1) Bad contact in the p.s.u. card -- main board connecting cable connector.
Banging the left side of the Mac is a temporary relief, re-soldering
the pads on the p.s.u card and cleaning the contacts is a more permanent one.
2) Just vertical line on screen / dead screen is caused by bad capasitor
on the p.s.u. card in the deflection circuitry. Locate the burst/bulging
part (marked 3u9/35v) and replace or have it replaced by a 4.7 u dry
capasitor, since the 3.9 u value is very hard to find.
Jarmo Puntanen /Tampere University Computer Centre, Tampere Finland