Alex Joni wrote:
> BGA's sure are tricky, but you can solder them manually using a hot air 
> system (seen a friend of mine doing it a couple times).
> the only problem is aligning them, that takes a bit of skill...
>   
Aligning them could be done with a fixture with a square hole in it.  
But, if the solder balls
bridge together or fail to connect, you have to take the part off and 
send it out for a $50 reballing procedure.
I checked at Digi-Key, the OMAP3530 processor chip, alone goes for $84.  
Put the two memory chips on top of it, add all the other stuff, and no 
way could I make a Beagle for under $200.  Obviously, other people can 
get the OMAP for a lot less than I can.

Also, inspecting the BGAs is done with an X-ray inspection system.  
Another "cant do that at home"
process.

Jon

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