[cobaltmute]

So your 3.3V is good and you just need to worry about the +2.5V?
 
If your -2.5V is good, you can take a wire and attach 1A to 1B and run with an unregulated positive rail (assuming you have no 2.5V regulator on the board).  Might have a bit more noise, but it will work as the LMH6643 is spec'ed to run at up to +-5.

 

[forsakenrider]

would I be better to connect the positive sides of C22 and C28 together? (maybe a little more smoothing?) Yes all other voltages are right on the money!!!
 
Jeeze, I wish I could understand what was wrong!
 

 

[forsakenrider]

ok I connected 1A to 1B as you suggested, 2mV offset of one channel and 3.2 on the other. But no sound!?? what can I check? Ive set it up as default, set it up in ASIO4ALL, I dont get it.

 

[cobaltmute]

What's your voltage at the 4.75V point?
 
So Windows has recognized and you can select?
 
Just to the left of U4, you will see three via's very close to each other.  None of these should be connected to ground.  There is also a trace just above those.  That should not be connected to ground either.

 

[forsakenrider]

Man this is getting tough! Ok, looks like there was a short there! I re flowed and now 3 out of 4 seem great, the center of the 3 is ~3ohm to ground, I scraped and re flowed and nothing! cant get that to go away. anywhere else thats connected (other then on U2, checked there)

 

[forsakenrider]

and youre right! short at U4, damnit, where did that come from!

 

[cobaltmute]

The short could be on U4 or on U2. Those are the I2S bus lines that provide the signal to the output DAC. Follow the traces.

 

[forsakenrider]

OMG that took forever!!! but, im hearing music now!! lets see if it holds up. litterally hours resolder over and over, finally I thought, heat the pin up where the invisible short is a tr and blow the short away, seems to have worked!!
 

 

[forsakenrider]

Ok so for the last two hours its been working and not working randomly. just now it was working for about 30 minutes and then crackled a little then nothing. It seems like the i2s lines are really sensitive or something, its not in a case and I wonder if it has to to with the non regulated + voltage. I guess I will take it to work tomorrow and blow it out with the air compressor. Maybe theres something in there or maybe the thermal paste is in fact effecting it.
 
Either way, this has been the hardest thing I have ever built! I swear it had some perfect looking solder joints but I guess they just werent good enough. Gotta remember to check, double check, and triple check next time!

 

[forsakenrider]

I AM IN HEAVEN FINALLY! so I woke up this morning with a new idea. I held the corner of the dac over a stove element to heat it up and then gave it a tap to shake off excess solder (we do this when tying and soldering spokes on a bicycle wheel, although a lost art). all better! Its been playing for an hour now!
 
SO, i think I can give a first impression while I enjoyed some tunes and had a coffee. One word comes to mind every time I upgrade my sound system, and that is detail. I heard clicks and taps I have never heard before in songs. I even played one song twice just to make sure I wasnt crazy! It feels like a big improvement over the Aliendac for sure, but time will tell!

 

[cobaltmute]

The sweet sound of success?
 
Glad it is working.

 

[forsakenrider]

very sweet sound. Now if my adapters for my wheels came in at work so I can build my new bike this day would be perfect!

 

[c12mech]

Glad you got it working.  Now if my parts will only get here.  I've got the 2707 mounted and that's it.  All the other parts are waiting to be picked up in Florida next time a flight goes there. 

 

[Gotez]

I received my board today and have started building. Lots of tiny parts!!! Will update soon!!

 

[tomb]

Quote:

I AM IN HEAVEN FINALLY! so I woke up this morning with a new idea. I held the corner of the dac over a stove element to heat it up and then gave it a tap to shake off excess solder (we do this when tying and soldering spokes on a bicycle wheel, although a lost art). all better! Its been playing for an hour now!
 
SO, i think I can give a first impression while I enjoyed some tunes and had a coffee. One word comes to mind every time I upgrade my sound system, and that is detail. I heard clicks and taps I have never heard before in songs. I even played one song twice just to make sure I wasnt crazy! It feels like a big improvement over the Aliendac for sure, but time will tell!

YAY!!