That was it TomB!  It works fine.. I just had to select it in the control panel.  Seemed strange that the other one would "claim itself" and this one wouldn't. At any rate, thanks mightily to you TomB, JdkJake, Cobaltmute and Particleman14! Thanks to TomB and Cobaltmute for the design and...

Ran resistance checks to ground with all pins and they are effectively identical between the two DACs Then powered, I ran voltage checks to ground and they match up there too.   So... just to recap... the unit gives the detection sound when I plug and unplug it but does nothing more on my...

What shall I measure btw? Voltage in reference to ground (+0)? Resistance to ground?   Thx.

Brilliant idea jdkJake!  I'll get back with you soon.

Unlike it shows in the last picure, Pins 2 and 3 are now connected again.

Yes, same USB jack on desktop computer.. straight into the computer (no hub).  Same type and length of USB cable for each DAC.  I even tried another brand USB cable as noted before. PGND is grounded to the 0V input/wire.

jdkJake,   Tied pins 2, 3 and the 3.3v hole back together once again.  Tested while running and it measure 3.3v as it should for the whole junction. Still working on laptop and not on the desktop.  Tried restarting the desktop but no change.   Cobaltmute, DAC2 is working, yes...

    Ha!  Not as pretty as it once was, no?  Too much fussin' perhaps.  ;)   When I desoldered the HOST and VCCP pins from each other the computer makes a detection noise once again... although there is not music and the computer's onboard sound card continues to play.   I've been...

Cable wiggles didn't seem to make a difference but I went ahead and replaced the cable.  No change.  :( No detection at all.. not even a chime. Posted a link in the regular GrubDac thread for Cobaltmute.  Good advice so far and thanks for staying with me on this.

Cobaltmute, Would you be willing to take a look at my posting about a GrubDac at a different location when convenient? http://www.head-fi.org/forum/thread/531688/grubdac-assistance-please   I would much appreciate your expertise.  Thanks.

Reflowed ALL the solder joints again and dug out the meter to check all the adjacent chip pins.  Everything seems to be in order.   Strangely, the DAC 1 is now working but only on my laptop. DAC 2 plays on both my desktop AND my laptop.   Do you think it could be the 2706... somehow...

Boy... I *think* that is correct.  I can take them off again and see what comes...

Grounded the braid on DAC1 today.  For some reason it is not even playing intermittently as it was before.  Any more ideas anyone?

Thanks for chiming in TomB and thanks for following up.   jdkJake, I bridged the missing traces with solder on both DACs and grounded the USB braid on DAC 2 to the appropriate place. I swapped out the oversize Wimas with appropriate substitutes and DAC2 is officially up and running.  I'm...

Thanks for the responses guys.  They are much appreciated!   I switched the polarity on the LED for DAC 1 and it now works.  Yay!   Reflowed X1, U1 and U3 with lots of flux on both DACs and cleaned again but no change. Checked C1 on DAC 2 an it appears to be fine.   The Wima caps...

Just built two Grubdacs and neither one is functioning correctly.  To make matters worse, I accidently tore out the "relief pins"  with a scratch awl (after trying solder wick) thinking they were bridges.  Eek!   Both DACs have larger than normal Wima Capacitors and neither currently have...