Desoldering Micro USB

General questions relating to ALL phone/tablet/ipod repairs.

Desoldering Micro USB

Postby carlday » Mon Jan 19, 2015 7:46 pm

Hi,

I have to change a micro usb and I cannot decide the best way to do it. I have the following

Metcal soldering iron
Desoldering station
Hot air statation
ACHI IR6000

I have seen videos on youtube and most just blast lots of hot air at the micro usb is this the best way or should I use the ir6000 and preheat the board and then use hot air or use the ir6000 all the way.

I am after ideas on the best way to do it.

Thanks

Carl
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Desoldering Micro USB

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Re: Desoldering Micro USB

Postby joshy » Mon Jan 19, 2015 8:38 pm

Best way is us a soldering iron and a solder sucker with some solder wick to clean.

heat the solder on the through hole pins either side one at a time from the underside of the board till its molten then suck it up with your sucker.

then use the solder wick to clean and desolder the data and power pins on top.

Finally use the wick from the underside to get any excess from the through hole pins you may need to hold the iron on for a short while and once youve got all the solder off it should just come out
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Re: Desoldering Micro USB

Postby TheBGAReworkMachine » Mon Jan 19, 2015 10:17 pm

There are many different ways to perform this repair. The best way depends on the way the port and board layout is. To be safe mask off areas with Kapton or Aluminum tape. Placing the board on the IR6000 to preheat it and then using the wand to heat it enough to just remove the port with tweezers.

If that is not suitable due to the board layout then the above post explains the soldering iron method.
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Re: Desoldering Micro USB

Postby joshy » Mon Jan 19, 2015 10:27 pm

I just prefer not to heat the board any unnecessary heat that can be avoided should be. but as said that method does work well but maynot be the best idea depending on surrounding components
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Re: Desoldering Micro USB

Postby Deus » Mon Jan 19, 2015 11:33 pm

Preheating at 100-125c, not to much stress on the components on the preheat side, but a big help using hot air.
Can even be helpfull using a solder iron.

Why do many wick a bga area while the board is still hot and on the rework station?
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Re: Desoldering Micro USB

Postby joshy » Mon Jan 19, 2015 11:40 pm

because the board is already hot and you have less change of pulling a trace.

each to there own i guess but a preheat i think is abit ott for such a basic repair which should take only a few minutes with a iron. tho i do agree i have thrown one or 2 on the preheater when they're being stubborn lol
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Re: Desoldering Micro USB

Postby Deus » Mon Jan 19, 2015 11:51 pm

Try desoldering a QFN without and then with preheating at 125c.

Years ago, needed to desolder a few large connectors, through hole.
Used this for it:
http://ersa.com/art-0t56-358-2018.html

Put solder in it, let it melt.
If you have a enough clear room aound the connector, dip it to the solder bath.
Slides out like a knife trough warm butter.
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Re: Desoldering Micro USB

Postby TheBGAReworkMachine » Tue Jan 20, 2015 2:17 am

joshy wrote:I just prefer not to heat the board any unnecessary heat that can be avoided should be. but as said that method does work well but maynot be the best idea depending on surrounding components


Yes when performing it on a large preheater found in a BGA rework machine you should mask off components. When using a SMT machine the heat is focused in that area.
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Re: Desoldering Micro USB

Postby sklickrick » Tue Jan 20, 2015 3:10 am

SMD heat gun and fine nozzle, with lots off flux and low melt.. easy job ;) ;)
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Re: Desoldering Micro USB

Postby D4Rk » Wed Jan 21, 2015 5:39 am

I use hot air and flux.
Just tape off the surrounding area with kapton tape to prevent burning surrounding components.
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