[vcf-midatlantic] MAC with squashed screen

william degnan billdegnan at gmail.com
Thu Apr 28 08:12:13 EDT 2016


thanks.
b

On Thu, Apr 28, 2016 at 8:09 AM, Ian Primus via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> Kind of covered - in my class on CRT monitor repair, I mentioned
> vertical problems like this, and in my old Mac class, I went over some
> of the basics there, but, didn't specifically get to this as it
> relates to Macs. It's hard to cram that much information into a one
> hour class - I had to move rather quickly.
>
> The 128 uses a pair of discrete transistors for it's vertical driver.
> One of the caps in that circuit has failed/is failing. I'm guessing
> it's C6. Failing that, it's either C5 or C11. While you're in there,
> be sure to resolder the yoke connector, it's a very common point for
> cold solder joints (will cause total loss of deflection)
>
> -Ian
>
> On Thu, Apr 28, 2016 at 7:57 AM, william degnan via vcf-midatlantic
> <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > I am thinking about working to repair the display on my '84 MAC,
> > occasionally the horizontal is "squashed" although for now it recovers.
> > Was this covered in any VCF E classes this or last year?
> >
> > http://vintagecomputer.net/browse_thread.cfm?id=95
> >
> > I assume there are a few places on the web that describe MAC repairs like
> > these, but any comments as to what to target are welcome and will save me
> > some time.
> >
> > b
> >
> > --
> > @ BillDeg:
> > Web: vintagecomputer.net
> > Twitter: @billdeg <https://twitter.com/billdeg>
> > Youtube: @billdeg <https://www.youtube.com/user/billdeg>
> > Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
>



-- 
@ BillDeg:
Web: vintagecomputer.net
Twitter: @billdeg <https://twitter.com/billdeg>
Youtube: @billdeg <https://www.youtube.com/user/billdeg>
Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>



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