685f76c9
From: et472@ncf.ca
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On Sun, 20 Apr 2008, marmotking wrote:
> On Apr 8, 4:37 am, "Mike Y" wrote:
>> "marmotking" wrote in message
>>
>> news:7e2042da-d69d-4df8-bdbb-7eeb86c7968c@a9g2000prl.googlegroups.com...
>>
>>> Major bummer this evening...I came home tonight excited to do some
>>> work on a Model 4 software project only to find the video of my
>>> working Model 4 dead. What happens is the whole screen is being
>>> displayed on a single horizontal line in the middle of the CRT. Now
>>> this is probably some sort of sync issue, but I'm curious to know if
>>> it's most likely an issue with the CRT driver board or an issue with
>>> the video signal generation on the motherboard. I haven't tried to
>>> diagnose it yet, so I'm wondering if there's advise on the most likely
>>> place to start looking...
>>
>> Before diving in looking for something major, look for a loose connection in
>> the vertical. It could even be loose to the deflection coils...
>
>
> Yes indeed! It turned out that there's a set of 4 or 5 wires that
> connnects the coils to the driver board. It appears that the plug on
> the driver board was loose. Thanks! It seems to be working now that
> I re-seated the plug.
>
You should see the inside of a Mac Plus.
I was given one back in 1993 because it had developed flakey video, and
the dealer wanted something like 3 or 4 hundred dollars to fix it
(obviously change the board). But it wsa merely that the connector
to the deflection coils had gotten flakey, to the extent that it had
partially burned the plastic of the connector. I just jumpered the
connector, and it never gave me any trouble after that.
But it was a really common problem, ultimately easy to fix but the
Apple solution just blew it out of proportion.
Michael
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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