Re: Strange 6101 jittering and pincushioning

From: Xyla <xduval_at_xyla.net>
Date: Tue Jan 31 2012 - 15:58:09 EST

Well, I doubt it's on the main board, because I have two Major Havoc
boards that do exactly the same thing. However, I wonder if it is
something on the adaptor board... I only have one of those.

Nothing on the game boards can explain the pincushioning though...
I've tried 3 Tempest boards, and it's definitely the monitor doing
that. There's no jittering with Tempest, but the jittering on MH only
shows up when the monitor is drawing a lot more than Tempest ever
does.

On Mon, Jan 30, 2012 at 3:28 PM, Mendel Pearl <mypearl@dds.nl> wrote:
> On my Space Duel, it was the 6012 DAC of the X channel, after replacing the
> opamps and analog switching IC's. It had the exact same symptoms you're
> describing.
>
> - Mendel
>
>
> On 26-1-2012 15:13, Andre wrote:
>
> i would be interested in hearing if you solve this. my space duel has
> something similar that is best seen on the screen where you can chose the
> type of game. the scores and ships available shift up and down a quarter
> inch sort of thing as the game choice is flashing, in time with the
> flashing.
>
>
> Sent from my Samsung Captivate
>
>
> Xyla <xduval@xyla.net> wrote:
>
>
> Hi,
>
> I have a WG 6101 that when I run Major Havoc on it, when the screen
> gets really full and the vectors are flickering a bit, the vectors get
> very jittery in the top corners.  When there isn't much being drawn it
> is totally stable.
>
> There is also a slight pincushioning... I know it's not the MH adaptor
> because it can be seen on Tempest.  I've tested with two Major Havoc
> boards (both jitter), and I've tested the same Tempest board on a
> different monitor with no pincushioning, so these problems are
> definitely occurring within the monitor itself.
>
> I got this monitor recently, and it looks brand new.  It was sitting
> in someone's house for years... has no burn, and there was still hot
> glue on the flyback controls.  I did a full recap and installed an
> LV2000 lite, and even did the Major Havoc diode mods to the underside.
> Unfortunately I do not know for sure if these problems were occurring
> before I did all this... I didn't want to run the monitor for more
> than a few moments before recapping it.  But, I did not notice any of
> these things happening until after all the preventative maintenance.
>
> My first question is, could the MH diode mod be causing any of this?
> I read that it was unnecessary if you install the LV2000, but I was
> just being thorough.  I figured I'd ask before I undid the mod.
>
> Other than that, do these symptoms sound indicative of anything else?
> I did not replace any of the T0-3 transistors... maybe I should?  But
> again, I did not notice any problems before the work I did on it.
>
> Thanks for any assistance.
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Received on Tue Jan 31 15:58:20 2012

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