[ Attachment(s)   from   joseph.redhemption@...   included below]  

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