Resistance Check Failure [solved]

I tried to plug the amp to my dedicated soundcard, a usb DAC, and onboard audio, tried swapping RCA jacks around, all resulted in left channel audio only.

If I connect the headphones directly to any of those devices stereo audio works in both channels.
 
Your voltages all suggest that the amplifier would pass signal.

You can temporarily short together the middle lug of each level of the volume pot, then see if the amplifier will play from both channels.

If it does, you probably have some solder shorting out the right RCA jack.

If it doesn't, you probably have a loose wire feeding the right channel of the headphone jack.
 
I believe this time around I checked the wires that should be relevant for the right channel very closely and do not see anything loose (or not making proper connection). I also don't see any solder that may bridge a connection to cause a short.

Could you please explain how to short the middle lugs of the volume pot for testing?
 
If you have a clip lead, connect one end to the middle lug of the bottom row of the pot and the other end to the middle lug of the top row.

If you don't have clip leads, use a piece of wire and solder this connection.
 
Hey guys!

I isolated the problem, it was the 3.5mm to 6.35mm adapter I was using, I found it around the house and noticed an "M" on the adapter moments ago (mono). I appreciate you guys sticking through my lack of general understanding and being patient with my problems.

Thanks to everyone in this thread that helped me come to a fully functioning Crack. Time to go do some listening. (paired with HD650's if anyone was interested)
 
Ha ha, yeah, it's those external components that can be a real bugger.  We run into stuff like this in the lab pretty often, it certainly helps to have multiple sets of eyes.
 
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