If there is a way to debug a PCM2707, I'm not aware of it. I once built a pupDAC and used too-high a soldering temperature on my Hakko. It fried the PCM2707, but it was h*ll figuring that out.
Despite that statement above, I can't seriously suggest that's what happened to your DAC - sight unseen. I still think something is shorting out. In my case above, every single voltage on the PCB was right on. It just didn't work. Yours seems to be a different issue.
Ah snap! That could very well be it! My iron was set very hot, as I was using it for large point to point soldering. I did not think about lowering it as I figured it wasn't gonna be an issue if I left the iron on the pins only a second. But with the number of pins on those chips, I could have over-heated it.
How did you come to the conclusion the chip was fried? Any definitive test I can run?
I only mentioned it because you were asking about the PCM2707. Remember that I said in my case, all the voltages were dead on (and there are many on the PupDAC) - it just wouldn't connect without a PC USB-connect error, no matter what I tried.
Yours seems to be a true short somewhere with the voltages off and the tremendous heating.
Edited by tomb - 2/21/14 at 6:24am