Desoldering Micro USB

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

Re: Desoldering Micro USB

Postby carlday » Wed Jan 21, 2015 8:12 pm

Thanks for all the replies.

I have had a failed attempt and I will try again tomorrow.

I covered surrounding components and I tried a soldering iron and solder sucker with no luck then tried hot air and flux still no luck. I must be doing something wrong I can solder lots of smd chip really well but I am being beaten by micro usb.

I did check the temp of my hot air station and that gets upto 400C so it is working.

Tomorrow I will try preheating the board.

How long should it take with hot air?

It is on a sony xeperia M
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Re: Desoldering Micro USB

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Re: Desoldering Micro USB

Postby joshy » Wed Jan 21, 2015 8:29 pm

get a small blob of solder on the iron befor hand to help transfer the heat it will also give the sucker something to grab....pun not intended :lol:

with a hot air gun and a fine nozzle just hold the port with some tweezers and hold the nozzle directly over the old port and when its ready it will come away. dont pull on it tho dont want to pull a trace.
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Re: Desoldering Micro USB

Postby carlday » Thu Jan 29, 2015 8:39 pm

Hi,

I managed to desolder the connector, I could not get anywhere with the soldering iron so I gently preheated the board and blasted hot air on it. It did seem to take ages but eventually it did lift and was a nice clean lift. I soldered new connector today and the phone is fixed. I did worry that the hot air would cause damage but it did not (I did cover the board with aluminum tape as i had no kapton tape).

I have a couple more questions.

I used flux to help with the desoldering and resodlering, I only have insat flux or a tacky flux. I used the insat. What does everyone else use?

When I soldered the connector I did it with my iron and thin solder would solder paste be any better for resoldering.
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Re: Desoldering Micro USB

Postby Deus » Thu Jan 29, 2015 11:47 pm

Basic rule, as you experienced, for more difficult parts: PREHEAT!.
It's industry guideline.

Gel flux has a broader activation window, will stay a bit longer active compared to liquid flux, better for lead free.
Assume it is flux for lead free soldering?

Solder wire or paste, depends on the job.
For trough hole soldering wire is perfect, eventually add some flux.

The best way is what works best for you on that specific job.
Is it trough hole or smd? What pitch?
What type of pins? How many?
Easily reachable with solder tip? Or mayb better to use hot air?

There are some techniques making it easier sometimes.
Do almost everything with solder wire and extra flux.
On smd chips/connectors with j-lead or flat pins drag soldering with a hollow tip, like this:
https://www.youtube.com/watch?v=AsXSkG_Qee4

You should practice smd soldering on scrap pcbs, try out what you find best way to do it.
You'll probably make shorts at first, no problem.
Add a bit of flux, go over it with solder tip, sliding away from chip usually, or wick if needed, short is gone.

Practice removing shorts on scrap boards too.
You won't stress out anymore if you have them on things you repair as you know how to get rid of it easily.

Just try it out and practice what works best for you.
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Re: Desoldering Micro USB

Postby D4Rk » Fri Jan 30, 2015 1:35 am

The worst port repair that I have ever had to do was on a BEATS PILL 2.0.
They have that ridiculous proprietary board that protrudes off the main board.
No room whatsover to really do a repair on it.
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Re: Desoldering Micro USB

Postby chhrisedwards » Fri Jul 28, 2017 7:46 am

You should not remove the iron before putting the sucker on the joint. Doing this, let the joint cool down before vacuum is applied. The sucker has a heat resistant nozzle that can stand the heat of the soldering iron tip. You should put the iron's tip on the joint, and apply the sucker's nozzle on the tip and the joint, then operate the sucker's pump without removing the iron from the joint.
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Re: Desoldering Micro USB

Postby chhrisedwards » Tue Sep 19, 2017 1:58 pm

You will need flux and yes desoldering braid will make it a lot easier. No pump needed and ensure that your soldering iron is hot enough. Clean the iron, apply some flux to the tip and then melt some solder on the soldering tip. Apply some flux to the contacts you are desoldering then heat those up with the soldering iron and use the braid in between. Once it is unsoldered clean the pads with flux and braid.
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