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Tech Helproom


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desoldering problem


john12

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Hi and thanks for reading this post.

I have a bad capacitor on a motherboard and in order to change it i purchased a reel of desoldering wick from ebay, just a generic brand from china.

After applying onto the joint and plenty of heat the wick would not draw up any of the solder, then i used a large blob of solder paste which helps the solder to melt more easily, but nothing.

I was advised that "Goot" is a good brand of desoldering wick so back i went on ebay, when the stuff arrived it was useless.

Has anyone actually purchased desoldering wick which works first time without any of all this hassle i am experiencing, where is a reliable source which will deliver what they advertise and not rip me off.

Many thanks in advance. John.

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caccy

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If you handle the end of any type of solderwick it will not wick up properly. Suspect it is due to the oils on your fingers. Over many years of electronic servicing the actual method of component removal is a personal thing.

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Diemmess

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It may be that the capacitor wire is a very good fit on the board and capillary action makes the very small amount of solder cling best to the capacitor lead.

Can you try a small screwdriver under the capacitor as a lever, one lead at a time once the site is hot? There may be very little to remove and with luck there will be holes where the new leads must go.

Frankly I could never get on with the tape. I use a combination of solder sucker, leverage, or even on occasions if there is too much solder around, blow the surplus off with a close blast, trying not to let my lips touch!

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wiz-king

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Diemmess I bet you have a carpet covered with solder splats!

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Diemmess

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wiz-king - Vinyl tiles in my workshop. The splats brush or scrape off easily unless they land on fabric.

I hope john12 isn't cooking the rest of the board with ever increasing the power of the -iron

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woodchip

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wood cocktail stick is good for clearing holes

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chub_tor

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Good point woodchip, I have also used those in the past having had my fingers burned by conducted heat rising up the pin. Usually depends on what's to hand for me, pins I have in the study, cocktail sticks are in the kitchen so laziness usually wins.

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VCR97

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John, I just put the braid on the joint, not at one side with the iron at the other side. If you pressed the braid onto he joint then,as suggested by "caccy" above, the braid might have traces of skin oil on it.

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Ian in Northampton

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Could there be an issue with leaded and non-leaded (RoHS) solder here? I'm no expert with a soldering iron...

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woodchip

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you need flux on the braid if its not sticking to it, or it may be old tarnished braid that needs throwing way

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john12

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Hi. Thanks for the replies.

Can the wick get the solder completely out of the hole or does it just remove the surface solder.

Many Thanks. John.

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