10 Sep
2011
10 Sep
'11
1:57 p.m.
Tony Duell wrote:
I find if you first use the tiny flat screwdriver blade on the solder
side of the board - pushing the leg portion that pokes out in towards
the centre of the IC position, then push the same leg outwards this
frees it up , if not then using the tiny flat blade against the leg
where it enters the solder feed-through hole is the next step as Tony
says.
You will often here a click/pop/snap noise as the leg releases from the
tube.
Lastly I take a pair of expanding jaw pliers (for chips up to around 28
pins) grabbing the ends of the IC and rotating it gently on the same
plane as the PCB. This helps free any remaining legs.
I then put the pliers down and lift the IC with my fingers.
If you can't lift the IC with your fingers you have not release all the
legs, don't try prying - this only leads to tears and swearing...
I use a Soldapullt (Blue, or the Silver Anti-static), have tried many
processes and this tool is my most used for small board repairs (40 to
80 pins or less).
http://www.hmcelectronics.com/product/Edsyn/DS017
John :-#)#
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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"Old pinballers never die, they just flip out"
(resending
from a different account, apologies if this is a duplicate)
I have a 16-pin IC to desolder and I am struggling.
Since I last asked about desoldering I have got a lot better with a
de-soldering pump and can now clear the hole in the sense that I see a black
hole rather than solder, and I can see daylight through all the holes (but
for most of the holes this is only if I angle the board the right way).
However, in this case the solder seems to be going all the way through and
slightly onto the component side surface where I can't get at it with the
pump. I have jiggled the pins to try to break any last bits of solder, but
the chip is still very solidly attached.
First trick. Use a small flat-balse screwdriver on the component side of
the PCB, right against the PCB to force each pin towards the body of the
IC (pushing parallel to the PCB, or as near that as you can). This often
breaks the last bond and lets the thing come out.
Any advice?
Do you care about the chip?
If not, use a fine pair of cutters to clip the pins off and remove the
body of the IC. Then grip the stub of each pin with pilers , melt the
remaining solder and pull it out. Clean out the holes using a solder
sucker on the component side while melting the solder iwth an iron on the
track side.
-tony