Quote Originally Posted by jgarner71 View Post
Hello everyone, my first post and all. Great forum, so many interesting things here.

I'm new to the audio mod stuff and I tried to mod21 (http://www.beresford.me/Downloads/Mod21.pdf) my Beresford and it didn't like it, so now I've got two of them. I'm terrified to try anything with the 2nd one at least until maybe I can figure out what went wrong with my first attempt.

What happened is right after I performed the solder bridge part I hooked it back up and tried it out. It started playing initially, then after about 20 seconds the left channel started crackling, then quit. I'm pretty sure I didn't burn anything up with the iron and I checked the connections with a ohm meter and they seem to be sound. But I don't really know where to start troubleshooting this.

If you guys have any ideas for me to try your suggestions would be greatly appreciated.
Post a couple of close up pics and we'll first see if we can see anything obvious .

I don't have one of these dacs but should be able to spot anything that looks suspicious

What I'd do is check the signal lines on a scope from the dacs output pins and further up stream

If you changed the capacitors as in the mod21 pdf be sure they are in the correct way around

The op-amp may have blown on one side, this can be caused by shorts or over heating of the pins

The dac chip may have blown its left side (unlikely)

There maybe a tiny intermittent solder short

If you give up and feel like binning it , sell it me