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How to remove a SMD resistor

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modeng200024/02/2022 17:33:07
311 forum posts
1 photos

I would like to be able to remove a SMD chip resistor. Unfortunately it has been fixed with adhesive and soldered. I assume the adhesive won't soften with heat so what is the best way to approach this?

John

Martin Connelly24/02/2022 17:38:48
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2182 forum posts
227 photos

The controls department where I used to work used a hot air tool specifically designed for this type of thing. Looks more like a soldering iron than a hairdryer.

Martin C

Joseph Noci 124/02/2022 17:53:56
1099 forum posts
1317 photos

Heat does work even if the adhesive is epoxy, etc. Use 20-40watt iron with a tip that can cover both ends of the SMD, put a blob of solder on the tip and apply to the smd - keep it in contact with both ends for 10-15sec. Use a small jewellers type screwdriver to gently prod at the smd every few seconds - it will move away..

This will not work well if the PCB is phenolic/resin impregnated paper, etc - works fine on fibreglass pcb's - FR4, etc.

Hot air may work, but will take longer and will heat the surrounding bits more than necessary.

modeng200024/02/2022 19:41:13
311 forum posts
1 photos

Thanks both for your helpful replies. The pcb is fibreglass so I'll give it a try.

John

Andrew Johnston24/02/2022 20:06:27
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6674 forum posts
701 photos

How big is the resistor and what sort is it? For standard thick film chip resistors I use two 80W irons, one on each end. Even with glue once the solder is molten the resistor can be removed by pushing gently with the irons.

Andrew

Grizzly bear24/02/2022 20:08:33
303 forum posts
8 photos

How To Remove Surface Mount IC/smd IC - Learn 4 Neat Methods - YouTube

Good luck ...........

noel shelley24/02/2022 21:25:33
1444 forum posts
23 photos

I would use hot air, especially to fit a new one. Use foil to protect other components around the site.Noel.

Edited By noel shelley on 24/02/2022 21:27:36

modeng200025/02/2022 10:52:58
311 forum posts
1 photos

The resistor is approx 3mm long, value 110k

I'm sure it will let go with sufficient heat on both tags.

John

Andrew Johnston25/02/2022 12:12:00
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6674 forum posts
701 photos
Posted by modeng2000 on 25/02/2022 10:52:58:

...resistor is approx 3mm long...

Probably 1206, ie, 120 thou by 60 thou, or 3216 in metric. Huge, should be no problem removing it.

Andrew

Joseph Noci 125/02/2022 13:15:54
1099 forum posts
1317 photos

Is the resistor broken/open cct? Do you need to fit a different value? If you need a lower value, put a suitable value in parallel - easier than removing the present one. If you need a larger value....

Joe

modeng200025/02/2022 20:57:14
311 forum posts
1 photos

Thanks Andrew.

Joe, I believe it is o/c and will consider paralleling with a conventional resistor for test purposes if this is the case.

Not sure if there is room to leave a wire-ended resistor in place when reassembled.

John

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