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2009-11-22 by dvdborn
Since a while my IIx has vertical lines across the screen. You can see a picture of it here: http://kunst.phl.be/~dvdborn/fairlight/vertical_lines_IIx.JPG Does anybody know which component in particular is the culprit? David http://dvdborn.blogspot.com
2009-11-22 by Gordon JC Pearce
dvdborn wrote: > Since a while my IIx has vertical lines across the screen. > > You can see a picture of it here: http://kunst.phl.be/~dvdborn/fairlight/vertical_lines_IIx.JPG > > Does anybody know which component in particular is the culprit? > > David > http://dvdborn.blogspot.com Dying video RAM. It's possible it's also some of the glue logic surrounding the video RAM, or the shifter, but the dynamic RAM is pretty fragile. Gordon MM0YEQ
2009-11-23 by Glenn
After a hopeful reseating of a Q219, that'd be my first guess too: video ram, first, then the gizzards that surround it:) - Currently enjoying the Ryiuchi Sakamoto "Neo Geo" vid from your dvdborn page, first heard him in his work with Roddy Frame (w/ Fairlight, I believe, on "Dreamland" and such (though not shown in this live vid w/someone else on keys:http://www.youtube.com/watch?v=XX3y4UiQA18, and the two's "Same Dream, Same Destination":http://www.youtube.com/watch?v=oYt-OxK3zCE , but come to love the stuff he does on his own very much, especially ethereal, introspective stuff like: (without Fairlight content)Rain:http://www.youtube.com/watch?v=8tKfYwc4zxA Merry Christmas Mr. Lawrence:http://www.youtube.com/watch?v=5mfyCI82lWM Energy Flow:http://www.youtube.com/watch?v=btyhpyJTyXg last emporer: http://www.youtube.com/watch?v=PcGY0dStHuA Asadoya Yunta: http://www.youtube.com/watch?v=cSywA_un0gc Apologies for digressing so. Glenn --- On Sun, 11/22/09, Gordon JC Pearce <gordon@gjcp.net> wrote:
From: Gordon JC Pearce <gordon@gjcp.net>
Subject: Re: [Fairlight-CMI] vertical lines on IIx monitor
To: Fairlight-CMI@yahoogroups.com
Date: Sunday, November 22, 2009, 2:13 PM
dvdborn wrote:
> Since a while my IIx has vertical lines across the screen.
>
> You can see a picture of it here: http://kunst. phl.be/~dvdborn/ fairlight/ vertical_ lines_IIx. JPG
>
> Does anybody know which component in particular is the culprit?
>
> David
> http://dvdborn. blogspot. com
Dying video RAM. It's possible it's also some of the glue logic
surrounding the video RAM, or the shifter, but the dynamic RAM is pretty
fragile.
Gordon MM0YEQ2009-11-23 by Jean-Bernard EMOND
Yes for me is Video DRAM problems... on Q219 JB Le 22 nov. 09 à 23:13, Gordon JC Pearce a écrit :
>
> dvdborn wrote:
> > Since a while my IIx has vertical lines across the screen.
> >
> > You can see a picture of it here: http://kunst.phl.be/~dvdborn/
> fairlight/vertical_lines_IIx.JPG
> >
> > Does anybody know which component in particular is the culprit?
> >
> > David
> > http://dvdborn.blogspot.com
>
> Dying video RAM. It's possible it's also some of the glue logic
> surrounding the video RAM, or the shifter, but the dynamic RAM is
> pretty
> fragile.
>
> Gordon MM0YEQ
>
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Thanks all for the monitor tips. I hope I'll manage to get the video card back in 100% working condition. PS: if you like Ryuichi Sakamoto you should also check out Hector Zazou David http://dvdborn.blogspot.com --- In Fairlight-CMI@yahoogroups.com, Glenn <glenn234@...> wrote:
> > After a hopeful reseating of a Q219, that'd be my first guess too: video ram, first, then the gizzards that surround it:) > - Currently enjoying the Ryiuchi Sakamoto "Neo Geo" vid from your dvdborn page, first heard him in his work with Roddy Frame (w/ Fairlight, I believe, on "Dreamland" and such (though not shown in this live vid w/someone else on
2009-11-23 by dvdborn
Thanks all for the monitor tips. I hope I'll manage to get the video card back in 100% working condition. PS: if you like Ryuichi Sakamoto you should also check out Hector Zazou David http://dvdborn.blogspot.com --- In Fairlight-CMI@yahoogroups.com, Glenn <glenn234@...> wrote:
> > After a hopeful reseating of a Q219, that'd be my first guess too: video ram, first, then the gizzards that surround it:) > - Currently enjoying the Ryiuchi Sakamoto "Neo Geo" vid from your dvdborn page, first heard him in his work with Roddy Frame (w/ Fairlight, I believe, on "Dreamland" and such (though not shown in this live vid w/someone else on
2009-11-27 by dkevefnzs
Hi. I think that this comes from one defective bit in a buffer or shift register or even an interrupted printed-wire-connection on the PCB, rather than from a video RAM chip. Because it happens in every vertical line, and in every horizontal place (I guess every 8 pixels?). So multiple RAM chips would need to be affected all in the same place to cause such a consistent pattern, or one RAM chip would need to output one bit so strongly that it would override anything any other RAM chip would output onto the same line at some other point in time. I fixed an earlier video board of a CMI II several months ago, and if I remember it right, there is a parallel to serial shift register on the way from RAM (8 bits parallel) to video out (8 bits serial). Clamping one bit on the input of that register (?) to (I guess) low (?), would give a pattern similar to what you photographed (clamping one input bit after another would do the trick for either of the 8 bits in the sequence, and maybe I did this only after I had removed another socketed IC right before that shift register? Unsure.) Probably, your problem can be either on the way from CPU to all RAMs or on the way from all RAMs to that shift register. You can find out whether it's CPU to RAM by writing a few different values to Video RAM in the debug console, and reading them back again. If you get them all back ok, then the problem is most probably between RAM and the shift register. Take into account possible auto xy update logic etc when doing the test. Sorry it's been some time ago I did that work; I can look it up in my notes, but rather after 17th of Dec. Greetings, Joerg --- In Fairlight-CMI@yahoogroups.com, Gordon JC Pearce <gordon@...> wrote:
> > dvdborn wrote: > > Since a while my IIx has vertical lines across the screen. > > > > You can see a picture of it here: http://kunst.phl.be/~dvdborn/fairlight/vertical_lines_IIx.JPG > > > > Does anybody know which component in particular is the culprit? > > > > David > > http://dvdborn.blogspot.com > > Dying video RAM. It's possible it's also some of the glue logic > surrounding the video RAM, or the shifter, but the dynamic RAM is pretty > fragile. > > Gordon MM0YEQ
2009-11-27 by dkevefnzs
Hi again, add on to my previous note: Apparently, your image is more complex. I just note you also have dark lines and a few stray pixels in the middle of the menu options list, so my previous explanation may not be sufficient. Sorry. Greetings, Joerg --- In Fairlight-CMI@yahoogroups.com, Gordon JC Pearce <gordon@...> wrote:
> > dvdborn wrote: > > Since a while my IIx has vertical lines across the screen. > > > > You can see a picture of it here: http://kunst.phl.be/~dvdborn/fairlight/vertical_lines_IIx.JPG > > > > Does anybody know which component in particular is the culprit? > > > > David > > http://dvdborn.blogspot.com > > Dying video RAM. It's possible it's also some of the glue logic > surrounding the video RAM, or the shifter, but the dynamic RAM is pretty > fragile. > > Gordon MM0YEQ