Filtering supply lines

[Paul Beam]

>i may have blown the injector drivers on my ECM with shorted 
>injectors. whats the likelyhood of replacing surface mount chips by 
>hand or otherwise?

If there are a small number of leads, you should be able to cut each free
from the package and remove the pads one by one with a soldering iron.  A
new chip can be soldered on if a small tip is used -- this should work for
SO packages as well as small transistors, etc.

If it is a package with a high pin count and the pins are very close
together, I have seen them removed with the use of a hot air gun like is
used for heat shrink tubind.  ( A hairdryer doesn't get hot enough.)  If you
heat the whole package, you can pop it off with a small screwdriver.
Replacing it is rather tricky without special tools.  I have seen someone
solder it by hand and then use solder wick to remove the solder between
pins.  I haven't actually tried these techniques, but I have personally seen
them done.



R Paul Beam
Computer Systems Engineer
Johnson Bible College
7900 Johnson Drive
Knoxville, TN 37998
(423) 573-4517
(423) 579-2337 fax