Hi, here goes a photo to help to isolate power lines. It was taken from a polish diy forum. My polish is poor, but the label is may be not correct :-)! On the picture the labeled line goes directly to the Vref leg of the DAC chip. I disconnected it by a sharp blade, and soldered a new 5 V power inlet, according to the green arrow. Be careful, not to cut deep and wide, because of the ground is close. The +5 V analog of the DAC goes at the under-side of the board. It is good to separate too. Now, we can install and connect separated 5 V supply for DAC chip. Don't forget: the receiver still needs 5 V (3.3 V fits too, or not enough?), because to choose one of the spdif input (optical or coax).
Separated power
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