EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: RBeaubien on November 18, 2016, 04:21:07 am
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Ok, I'm hoping there is a trick to this. How do you remove SMD chips with exposed pads (like the MP1584EN or the MAX7456-EP)? I have boards with defective chips and when I try to remove the chips, I end up having all the other components around them come off BEFORE I can heat the chip up enough for the exposed pad to release. I'm talking 4-5 minutes here at 750°F. Any guidance would be appreciated.
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Hopefully this will help?
If the board is densely populated I use the smallest nozzle i have and around 360-380C/680-716F. Circle the IC about 2.5cm away.
If that fails i run a fine wire under the legs on one side of the IC and user an iron to melt the solder as i gently pull the wire up, lifting the pins as it goes.
If that fails, and it rarely does, i cut the legs from the IC package with a scalpel and remove the remains with an iron.
RR
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These chips are both SMD TSSOP or SOIC.......Use Chip Quik and an iron or with a heat gun. I found using a iron works well!
http://www.chipquik.com/store/ (http://www.chipquik.com/store/)
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preheat the pcb?