[time-nuts] HP 5370B low frequency modulation
SAIDJACK at aol.com
SAIDJACK at aol.com
Thu Jul 26 14:51:27 EDT 2007
In a message dated 7/26/2007 01:28:55 Pacific Daylight Time,
magnus at rubidium.dyndns.org writes:
>sy cooling flange. On another board we glued a nut to the top of the BGA
>and hanged 50-70 kg of it and while the board was clearly bent the BGA was
>still firmly hooked to it. Now that's the difference between a few um of
gold
>too much or not.
>There are other cases where the gold-plating is not an issue.
>This has been covered in public sources, so a dig around would give some
>indication.
>Cheers,
>Magnus
Hi Magnus,
I've had a board with what the manufacturer called "black pad" syndrom: the
BGA literally popped off by just bending the PCB sufficiently. The solder
joint was useless.
Is this caused by the problem you described?
Also, what do you think is a better process: gold-flash, or gold-immersion?
bye,
Said
************************************** Get a sneak peek of the all-new AOL at
http://discover.aol.com/memed/aolcom30tour
More information about the time-nuts
mailing list