11 Aug
2006
11 Aug
'06
7:39 p.m.
e.stibler pontificated:
Yup, get ready to solder .2 mm balls on 800 balls BGA.
Get your toaster-oven ready ;-)
The really annoying thing about BGA is that I haven't figured a way to
desolder and reuse chips. Very vexing.
11 Aug
11 Aug
8 p.m.
Scott Quinn wrote:
e.stibler pontificated:
Just desolder them, and clean nicely. And then use some of the
re-balling kits, every decent pcb-assembly house has ;-)
Yup, get ready to solder .2 mm balls on 800 balls
BGA.
Get your toaster-oven ready ;-)
The really annoying thing about BGA is that I haven't figured a way to
desolder and reuse chips. Very vexing. 
8:49 p.m.
On Friday 11 August 2006 07:39 pm, Scott Quinn wrote:
e.stibler pontificated:
Probably possible if you don't care at all about the board...
Just take it outside, and hit the back side of the board with a torch. :-)
For those boards where they didn't bend pins over, stuff just falls right out
if you do this right. A bit too long on one spot and the board catches fire,
which is when you find out why I said take it outside. Those fumes are no
fun at all.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Yup, get ready to solder .2 mm balls on 800 balls
BGA.
Get your toaster-oven ready ;-)
The really annoying thing about BGA is that I haven't figured a way to
desolder and reuse chips. Very vexing. 
12 Aug
12 Aug
12:35 p.m.
Scott Quinn wrote:
Surface mount is good food...except BGA. What a huge pain in the
butt. I understand the need for that sort of density, but PCB routing
for BGA is a big pain, and as you stated, dealing with the chips
physically really sucks.
I've done *all* types of surface mount stuff in my home lab...except
for BGA. The big show-stopper is the lack of means to inspect the
soldering job. Eventually I hope to obtain a small X-ray machine (of
the type used for bridge inspection, etc) to be able to check out the
soldered balls.
(soldered balls...ow!)
-Dave
--
Dave McGuire
Cape Coral, FL
Yup, get ready
to solder .2 mm balls on 800 balls BGA.
Get your toaster-oven ready ;-)
The really annoying thing about BGA is that I haven't figured a way to
desolder and reuse chips. Very vexing. 
1:09 p.m.
On Sat, 12 Aug 2006, Dave McGuire wrote:
Scott Quinn wrote:
Surface mount is good food...except BGA. What a huge pain in the butt. I
understand the need for that sort of density, but PCB routing for BGA is a
big pain, and as you stated, dealing with the chips physically really sucks.
I've done *all* types of surface mount stuff in my home lab...except for
BGA. The big show-stopper is the lack of means to inspect the soldering job.
Eventually I hope to obtain a small X-ray machine (of the type used for
bridge inspection, etc) to be able to check out the soldered balls.
(soldered balls...ow!)
-Dave
If you make sure that the balls are really melted (they flatten out) you can
usually get by by just sighting down under the BGA to make sure all the rows
between the balls are clear ( no merged balls). This means that you need to do
the BGA first so all sides are clear for visual inspection.
I've done lots of BGA protos with nothing more than a hot are gun and a lot of
flux (solder paste is not needed), they are really not so bad. (I've not done
any with smaller pitch than .8 mm as the initial alignment gets a bit picky)
Yup, get
ready to solder .2 mm balls on 800 balls BGA.
Get your toaster-oven ready ;-)
The really annoying thing about BGA is that I haven't figured a way to
desolder and reuse chips. Very vexing.
--
Dave McGuire
Cape Coral, FL
Peter Wallace
6560
days inactive
6561
days old
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