It does play with output though after loading the factory patches they don't sound correct when compared to my fully functional Matrix 6 in addition to the garbled display.

I went ahead and swapped the processor boards in the two synths, something not without some risk of damaging the good processor board. Nevertheless, installing the good processor board in the originally faulty Matrix 6 resulted in a fully functional keyboard with a slightly hissy output. Installing the suspected faulty processor board in the fully functional Matrix 6 resulted in power on problems whereby the display wouldn't light up, strange output on several of the factory patches, and a few of the keys in various places on the keyboard were non-functional. With regard to the power on problems, I'd have to cycle the on-off switch two or three times to get the display to light up. With the bad processor board in the 'good' Matrix 6 synth however, I didn't get a garbled display full of characters, only the display wouldn't usually light up on the first attempt at power on. When the display did light up in was readable. I went ahead and reloaded the original factory patches with the bad processor board however they still didn't sound correct...

--- In oberheim@yahoogroups.com , carl hourigan <sloppy.hq@...> wrote:
>
> I had the same problem for at least a year or so with my matrix 6. when it came to me half of the patches were normal the other half were the weird characters thing. the dude i got it from said he thought it was "some dead voice chips" i told him he was an idiot and to stick to playing guitars, then i bought it... (im dumb too i guess). one thing, mine sometimes would just be dead for a month then one day it would decide to power up and have crazy ass characters allover, or it would just power up fine to factory presets. after continuous tinkering for a year or so i have got it to power up every time into a hard reset/calibration mode, im not sure why it just jumps to calibration. In other words i cant save any patches i make unless i involve my librarian. Also i have no idea what i did to get it this far, because at this point ive tried every little possible thing to get it working right, voltages, battery, traces, wires, reseating, cleaning and psycho therapy...
> anyway its interesting to hear im not alone, hope you guys figure this out, i would love to get mine working perfectly.
>
>
> > Does it play OK, and you can still adjust parameters etc, only the display is problematic
> >
> > From: wesleyknick <wesknick@...>
> > To: oberheim@yahoogroups.com
> > Sent: Wednesday, 18 July 2012, 22:06
> > Subject: [oberheim] Re: Oberheim Matrix 6, Dead
> >
> >
> > I just joined the group yesterday. If you can point me to the previous discussion I'd appreciate it. The problem is it sometimes powers on without a display, other times it's limited to 7 or so characters and other times the whole diplay fills up with random characters than change when I press the keys. It seems too erratic to be a self-test mode.
> >
> > --- In oberheim@yahoogroups.com , Peter Mörck <peter@> wrote:
> > >
> > > This sounds familiar...
> > > Isn't this part of the display CPU self-test mode functionality, or
> > > something like that
> > > Wasn't something like this discussed on this list about a month ago or so
> > >
> > > BR,
> > > Peter
> > >
> > > ----- Original Message -----
> > > From: wesleyknick
> > > To: oberheim@yahoogroups.com
> > > Sent: Wednesday, July 18, 2012 10:47 PM
> > > Subject: [oberheim] Re: Oberheim Matrix 6, Dead
> > >
> > >
> > > Most of the time it just powers on with a string of characters in the
> > > display and pressing the keys simply enters new characters in the display as
> > > though I'm typing them in.
> > >
> >
> >
> >
> >
> >
>