This weekend, I made a bad PCB. The only option that was left, was creating a new one. But my PIC was already soldered on! After a search on the net, I didn’t find any approach with simple tools to desolder an SMD chip (in a way that it will still work afterwards!).
This and this are brilliant examples of how not to do it :-)
So I came up with my own solution:
- Put a lot of solder on the 4 sides of the chip.
- Turn an iron (to iron your clothes) upside down on maximum temperature.
- Put your PCB on it (no solder on the bottom).
- Now quickly heat up the 4 soldered sides with your soldering iron.
- The heat of the iron will make sure the solder remains liquid for a few seconds.
- You can use your soldering iron to push the chip off the PCB when you’re desoldering the last side.
- Do it quick so your chip won’t be burnt!
Good luck :-)