smd

Tony Bryant bryantt at psc.fp.co.nz
Mon Jul 22 21:39:06 GMT 1996


<stuff deleted>
> > If you need to remove a chip without
> > destroying it, use a thin isolated wire - put the
> > wire under the chip, and then warm up one pin at a
> > time simultaneously pulling the wire gently under
> > the pin. This will work almost every time on SOIC,
> > but PLCC package is another story.
> 
> PLCC requires, almost definitely, the use of hot air. 
> Solder-wick is the way to go with SOIC parts, IMHO,
> then use the wire like above.  The solder-wick will
> pull off most of the solder.
> 

Two words - Blow torch. A small pencil type butane blow
torch is the perfect weapon for removing smd chips (for
the hobbyist). 

If you dont care about the chip, heat 
the thing in the middle until all the pads get hot
enough, and tap the board on the table, and voila! the
chip falls off with no damage to the board.

If you dont care about the board go around the chip
(keep moving), playing the flame on the pins, and as
above tap the board on the table (or stick a jeweller's
screwdriver under a corner).

If you care about both, use the above technique. With a
bit of practice, its easy to do without damage to
either.

Works for DIP components too, but is generally more
brutal on the board. Still less damage than stuffing
around with solder wick or cutting pins.

For bulk junk board desoldering use an oxy-acetylene gas
axe (and a gas mask).

This message brought to you by: Pyro solutions inc. :-)


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* "Insanity is the only sane response to an insane world" *
*                 >> bryantt at fp.co.nz <<                  *
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