How do I easily removed components in a double-sided PCB? - diyAudio
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Old 11th July 2003, 12:41 PM   #1
jarthel is offline jarthel  Australia
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Default How do I easily removed components in a double-sided PCB?

Well I'm trying to replace the diodes "1N4007" with some ultrafast Onsemis. Well the problem is that the diodes are soldered on both sides and is very hard to remove.

Any ideas on how do it easily?

Thank you.

jayel
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Old 11th July 2003, 01:48 PM   #2
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Cut the diode off, leaving a little bit of lead. Heat the remaining lead, using some new solder. When the lead is good and hot and starts to move around (indicating the solder on both sides is melted) gently smack the board on a table top / bench top. The lead should fly right out.
So, the board is double sided, but not plated through? That is odd. If it is plated through, you should only have to heat one side. I use a dental pick to gently pry on the component while heating the lead. The lead will pop off the board when it is hot enough. The easiest way is to just clip the component off and remove the piece of component lead.
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Old 11th July 2003, 03:34 PM   #3
jarthel is offline jarthel  Australia
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very nice suggestion. I'll do it tomorrow.

Thank you.

jayel
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Old 11th July 2003, 03:40 PM   #4
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Do they sell "Solder Wick" over there??

Jocko
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Old 11th July 2003, 03:55 PM   #5
jarthel is offline jarthel  Australia
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I did try to use a solder wick but the solder won't attach or if it does attach, there's still residue and it's enough to still make it hard to remove the parts.

When use the wick, I placed it between the solder and the iron. Is this the right way?

Thank you

jayel
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Old 11th July 2003, 04:25 PM   #6
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If it's OK to ruin the part you want to remove I think nobody special's solution is the best. I practice it often at work. After removal I suck the hole clean with a desoldering station. It's hard to suck the hole totally clean and not damage the hole plating, therefore it's often better to warm the solder joint and then suck it clean.
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Old 11th July 2003, 06:44 PM   #7
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Quote:
Originally posted by nobody special
Cut the diode off, leaving a little bit of lead. Heat the remaining lead, using some new solder.
One of the most frequent problems you find in repairing stuff is blown diodes and resistors -- I just cut the device in half with a pair of diaganol wire snippers -- clean it up a bit and attach the new part to the old leads --
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Old 11th July 2003, 08:13 PM   #8
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Quote:
Originally posted by Jocko Homo
Do they sell "Solder Wick" over there??

Jocko
Solder wick sucks. Especially in this application. About the only good use for it is cleaning up the board after a component is removed. Even then, I never use it.
But that's only my opinion, of course.
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Old 11th July 2003, 08:15 PM   #9
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Quote:
It's hard to suck the hole totally clean and not damage the hole plating, therefore it's often better to warm the solder joint and then suck it clean.
Two words: "dental pick"
Seriously- a good way to open up holes carefully without damaging pads/traces. Heat the joint up and push it through carefully, twist back and forth as solder cools. Works every time! Faster than a solder sucker, and you don't have to clean it out.
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Old 11th July 2003, 11:42 PM   #10
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Quote:
Originally posted by nobody special


Solder wick sucks.
Isn't that what it's supposed to do?

-- you can get solderwick in all sorts of deniers btw.
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