Pretty sure the CPU does not read anything back from the display, so
if the display is not working, it should not prevent the synth from working.

Does the synth do anything at all

The display uses a higher voltage than the rest of the circuits. If that's not present,
then the display would not work, but everything else should. Also, there is a fuse
on the front panel board for the display voltage. You might want to check that.

Are you saying that you replaced CEM chips as preventive maintenance
If so, can I have the ones you removed :-)

Bob


--------------------------------------------

On Fri, 2/19/16, fknchino@... [oberheim] < oberheim@yahoogroups.com > wrote:

Subject: [oberheim] Oberheim Matrix 6 Display Issues
To: oberheim@yahoogroups.com
Date: Friday, February 19, 2016, 11:36 AM






























Hey everybody!
A while back my Matrix started playing up one day at
a friends house and kept on turning off randomly.
One day I took it home and from what I can remember,
the sounds were completely off and the display was jumbled,
then shortly after it stopped turning on.

I performed a diy fixes myself and replaced the caps
and rails, assuming it could have been a PS problem.

Replaced some buttons, bought and
replaced some CEM chips, replaced the battery, hell I even
replaced most caps with 'audiophile' grade nichicon
caps for fun.

Currently, I've got my Matrix
6 with a tech right now and he thinks there might be
something wrong with the display- hence why the matrix
isn't booting at all.
The power supply was tested and found
nothing wrong.
It's been over a few months and I havn't
brought it up since, he suggested it could be a tricky job
trying to identify the root cause.
Can anyone help with this
Would love to see this baby home safe soon.