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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: tone007 on June 16, 2008, 09:32:57 PM

Title: 1200 composite video interference fix?
Post by: tone007 on June 16, 2008, 09:32:57 PM

Hi,

I've got an A1200 that works perfectly except for some strange interference on my Commodore 2002 monitor (which works fine with everything else) when using composite output.  No problems (at least not noticeable) on my 17" LCD.  I guess I'd describe it as "swirly lines" going through the screen during drive access and/or higher processor usage.  Not enough to make it unusable, but it's pretty annoying.

I've searched Google and seen references to a problem that sounds similar and that it can be fixed by adding or swapping a resistor, but I've searched and can't find any more details.

Does this sound familiar to anyone?

Thanks.

Title: Re: 1200 composite video interference fix?
Post by: davideo on June 16, 2008, 11:03:43 PM

Hi,

I have the same problem with my towered 1200.

It'll be interesting to see if there is a cure and if it works.

Keep us posted please.

Dave G  8-)

Title: Re: 1200 composite video interference fix?
Post by: wolfchild on June 16, 2008, 11:31:53 PM

I remember having the same problem years ago on my early revision A1200.

It was only after several years that I found out a fix.  I did something like this:
http://mysite.verizon.net/jartz/amiga/flicker_fix.html

Cheers!
Edwin

Title: Re: 1200 composite video interference fix?
Post by: tone007 on June 17, 2008, 12:15:37 AM

Ooo. Now I've just gotta get up the nerve to take a soldering iron to the 1200's board...

Thanks a bunch.

Title: Re: 1200 composite video interference fix?
Post by: magnetic on January 06, 2011, 02:36:39 AM

tone

Did you ever do this mod? Anyone else?