Re: Replacement advice? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Replacement advice?
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Posted by Gene N [Email] (#1094) [Profile/Gallery] (more from Gene N) on Wed, 27 Feb 2019 07:41:01 Share Post by Email
In Reply to: Replacement advice?, Paul from Palmyra, PA, Wed, 27 Feb 2019 06:33:41
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Sure. I used a hot-air desoldering tool, but with an 8-pin package you might be able to get away with just a soldering iron. First, use solder braid and a chisel tip iron to remove as much solder as you can. Then run the iron across all of the pins until all the solder is molten. Quickly push the chip aside until is is free. Rub the iron and braid across the pads until all the solder is removed. Clean the board with alcohol and apply liquid flux to the pads. Put the chip in place so that the dot on the chip matches the dot on the board. Switch to a soldering iron (or change the tip) to one that comes to a sharp point. Hold the chip to the board with tweezers (just push down to keep the chip from moving, don't try to hold it). Touch the iron to one of the pins on the corner. Make sure all the pins are still in place on the pads. Go around to all the other pins and solder them in place. Add a little bit of solder to the first pin you set. Clean all the excess flux with a tooth brush and alcohol and carefully examine the joints with a magnifier to make sure there are no bridges.

The key is to use very, very little solder. Sometimes, just a little solder on the iron is enough. If you discover a bridge, use the braid to remove it.

Check out some of the YouTube videos on how to replace surface mount chips. Once you get the board out you will realize that everything is really, really tiny and close together. If you are going to be doing the Bifocal thing, you might think how you are going to see before you start.

Hope this helps.



->Posting last edited on Fri, 1 Mar 2019 15:41:55.
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