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Oh Blimey I bought a CNC Lathe !!!!

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MrSleepy:
If you do not have a hot air smd rework station then you should get one.. or use a standard hot air gun carefully..

An increasingly common feature of soic packages is a pad actually under the chip...but I'm sure yours will not.

On dips I have used a technique of cutting the pins off with a fine dremel cutting disk then unsoldering the remains individually.. but it takes practise a great care.


HTH Rob

Swarfing:
If you can get a thin piece of wire under the legs then just use a soldering iron, heat a leg at a time pull the two ends of the as you go lifting the legs.

MrSleepy:
The wire underneath trick works okay on older packages , but sometimes you have to go so thin on the wire that it snaps frequently making it worse...and if theres a conformal coating then its a nogo.

Circuit Specialists do a cheap hot air desoldering gun ... £57

http://www.circuitspecialists.eu/soldering/desoldering-hot-air-rework/hot-air-gun-w-digital-display-for-smds-csi-hotgun2

Handy for occasional use,

Rob

Swarfing:
Wire trick works fine for me. The cheap hot air guns you get from Aldi have a selection of nozzles, one of those is a small round affair which works well too.

awemawson:
I took delivery today of a kit containing a magic low melting point high fluidity solder. The idea is you swamp the legs of the SOIC with the new solder, that dissolves the original and stays molten long enough to lift the device away from the board. Not had a chance to unpack it yet due to other issues but the video looks good:

http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1850214

All sorts of confusing issues with the controller - seems I had the wrong PLC eprom inserted which accounts for some of the problems but I don't seem to be able to clear the Z58BRAM error. I am seriously considering reverting back to the 10 slot box as that uses a different BRAM card that cured the same errors in that box. I'm told the card addressing along the backboard is different but I would have thought that the 6 slot would be a subset of the 10 slot, and I will not be using the extra four slots! I will pull them both out on the bench and buss out some pins, but it's a bit of a daunting task as each slot has two 96 way sockets so there's a bit of effort involved ! 6 x 96 x 2 = 1152 points to be correlated on two backboards  :jaw:

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