[SubRosa]

I'm pretty sure you used rosin-core solder, the rosin is the flux. If I'm wrong I have no idea what's all over your board, just clean it off.

 

[Teerawit]

Quote:

Originally Posted by FallenAngel SubRosa: I'm not using flux, as for the cold joints, I'll see what I can do about fixing them, but damn it's a pain in the ass to redo all of them.

The flux is in your solder...it's that sticky stuff all around your solder joints.

 

[FallenAngel]

Oh ****, my bad, I am using rosin core solder, but just curious... how do I remove the flux?

 

[SubRosa]

I use isopropyl alcohol and an old toothbrush.

 

[FallenAngel]

Any ideas of what to use that I can find around the house (impulsive and impatient, I know

)?

 

[SubRosa]

Isopropyl Alcohol is commonly known as "Rubbing Alcohol", it's an antiseptic, you should be able to find it in your bathroom.

 

[Filburt]

This sounds like a bad chip to me.

 

[FallenAngel]

Damn. I'm Ukrainian, we don't use antiseptics, we use iodine. But I do drive, so would antifreeze work?

 

[SubRosa]

Iodine should work fine. Do not use antifreeze.

Also, I may have looked over it but do any of the op-amps or buffers get hot when you turn the Pimeta on?

 

[FallenAngel]

Well, I now have an extremely spiffy clean and totally disinfected board... but the offsets are still a little high.

1.32v on Right
1.72v on Left

And of course, everything stays nice and cool.

 

[Teerawit]

Quote:

Originally Posted by Filburt This sounds like a bad chip to me.

It takes alot more to kill these chips

You should redo those cold joints.

 

[FallenAngel]

I've tried reding the cold joints... and guess what, I get more cold joints, not sure exactly why, but 2 seconds after lifting iron, joint turns dull. Maybe soldering iron is crap (saving face).

Guess I'll have to redo the joint completly, as in get rid of old solder instead of just reheating it.

 

[SubRosa]

Either buy some flux or just add more solder when you're trying to reflow those joints.

 

[Teerawit]

Quote:

Originally Posted by FallenAngel I've tried reding the cold joints... and guess what, I get more cold joints, not sure exactly why, but 2 seconds after lifting iron, joint turns dull. Maybe soldering iron is crap (saving face). Guess I'll have to redo the joint completly, as in get rid of old solder instead of just reheating it.

That's the problem. A cold joint usually means that you burnt off all the flux in the solder joint. Simply reheating a solder joint will make it cold and dull if you heat it long enough. Adding more flux into the joint will make it shiny again.

 

[FallenAngel]

Thanks a lot for all the help guys, I'll be redoing the joints tomorrow (err... today, but much later as in after sleep & work, hate waking up for work with less than 6 hours of sleep).