hi, i have the same problem my Matrix 12, somebody told that I have to change old electrolytic caps with new, becouse they could change their value during the years. I didn't try it yet, but maybe it's the solution.
Simon
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I have recieved the new dac, put into place, made calibration but still same problem.
I have attached scope picture of the 5V supply, U903_pin4 and U904_pin2 to show signals.
There is this kind of burst on the 5V supply.
The signal on U904_pin2 look awfull.
Any idea what could be wrong