So, what can be done with the green fiber chips, they mostly measure about 1 1/2 x 1 1/2, soldered to mother board, green solder mask on top with small silicon glassy looking chip in the middle and a few MLCC around the silicon. How can you process these and do they have anything worth processing ?
Green fiber
- Thread starter aumoon
- Start date
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These are called north and south bridges. The new ones with Si chip on top contain no gold.
The older ones with black epoxy on top are good. They contain a good amount of gold bonding wires.
Use the searchwords bga and flatpack to learn about those.
Jon
The older ones with black epoxy on top are good. They contain a good amount of gold bonding wires.
Use the searchwords bga and flatpack to learn about those.
Jon
kernels
Well-known member
Yep, as above 'flip-chip' bga is worthless to us.
Tzoax
Well-known member
Don't forget that solder balls used to solder BGA chips to circuit board contains gold - about 1.42g per kilogram based on my tests. I just take them off with chisel and save them (from BGA chips and from the circuit board also). After taking off MLCC and solder balls i found a buyer who is paying 10eur/kg for those BGA flip-chips.
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=33&t=22951&start=90#p267815
Alex
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=33&t=22951&start=90#p267815
Alex
