help in ridding ash from chips with water

[steyr223]

Patnor i took this pic after i split the bga
Am i to believe the bonding wires
Are the ones i labled A if so how many .

These have very little if i am looking at it correct
They dont appear to be a wire but more of a plate kinda like a rectangle

They come in scanners , unitech

Anyways this was an excellent learning experience
I now want to get a pan and learn :mrgreen:

But i did put my boards up on craigslist today
I have to register my vehicle this month

I have not givvin up as i put all of my conc into poormans
Ar today and will see if i have any pm's once i finish the base metal dissolution

Thanks steyr223 rob

 

[g_axelsson]

You have two major pieces in your picture. On top is the fiber board and on the bottom is the die with the epoxy cover.
The top piece is basically a small circuit board which is gold plated on exposed parts. This is only a thin plate and usually not worth trying to recover. The board is the carrier, on the bottom is the solder balls and on top the die is placed. Thin bonding wires are used to connect the die to the carrier board electrically, each one going from the board to the top of the die. To protect the wires the top part is molded in epoxy. Sometimes with an integrated heat spreader, a copper plate embedded in the epoxy.
Since the gold wires is fully embedded inside the epoxy, when we rip the two pieces apart most of the crap (fiber board, tin balls) ends up in one part and the epoxy piece only have the die and 99% of gold.

Break the plastic piece in two and then take a microscope or a strong loupe and examine the break, you can see thin wires sticking out.

... or just check the forum where Geo posted http://goldrefiningforum.com/phpBB3/viewtopic.php?f=46&t=13667, Sam posted http://goldrefiningforum.com/phpBB3/viewtopic.php?f=34&t=12167 or I posted http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=52&t=11827&start=160#p161576 :mrgreen:

Göran

 

[steyr223]

Thanks Göran

As always you shed a good fraction of the info i have
Been banging my head aagainst the wall trying to find

I just got done with Geo's post

Thank you steyr223 rob

 

[patnor1011]

Patnor, that is THE most amazing use I've ever seen for a piece of scrap gutter. Kudo's my friend!

Haha... I only need to do better job on using silicone but I was in a hurry.