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Pelliott321
 Post subject: When things go very bad
PostPosted: January 11th, 2019, 2:44 pm 
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I took on a simple repair job for a client. I had to replace a USB connector on a USB receiver board on a music server.
I did not take pics of the mangled connector befor I removed it. but here is the completed repair.


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fix1.jpg
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Pelliott321
PostPosted: January 11th, 2019, 2:49 pm 
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when I was putting things together and connecting a 12 connector cable to the other side of the board the socket just popped off.
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Attachment:
fix3.jpg
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here is a close up
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Pelliott321
PostPosted: January 11th, 2019, 2:53 pm 
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To me the pads look like cold solder joints.
Any way it was a pain getting this soldered back on
Attachment:
fix5.jpg
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Instead of a 15 minute repair it was a 30 minute repair

Don't know if I will recover from this disaster today
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SoundMods
PostPosted: January 11th, 2019, 3:43 pm 
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Pelliott321 wrote:
when I was putting things together and connecting a 12 connector cable to the other side of the board the socket just popped off.
Attachment:
fix2.jpg

Attachment:
fix3.jpg

here is a close up
Attachment:
fix4.jpg



HOLY CRAP!!!! Cold solder joints all! Murphy's Law at work.

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tomp
PostPosted: January 11th, 2019, 6:05 pm 
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If anyone ever needs to repair a board with surface mount components I have a hot air re-flow station you can use.
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Pelliott321
PostPosted: January 11th, 2019, 10:34 pm 
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One does not need fancy equipment to do surface mount work
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DaveR
PostPosted: January 12th, 2019, 10:17 am 
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Pelliott321 wrote:
One does not need fancy equipment to do surface mount work


No, but it sure helps make it much easier.

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tomp
PostPosted: January 12th, 2019, 12:37 pm 
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DaveR wrote:
Pelliott321 wrote:
One does not need fancy equipment to do surface mount work


No, but it sure helps make it much easier.

Amen to that
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Pelliott321
PostPosted: January 13th, 2019, 8:59 am 
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Part of my problem besides being _______(you an fill in the blank), is I really do not understand how the hot air thingy works or how to use one. I guess this is a good one for YouTube
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SoundMods
PostPosted: January 13th, 2019, 1:06 pm 
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Pelliott321 wrote:
Part of my problem besides being _______(you an fill in the blank), is I really do not understand how the hot air thingy works or how to use one. I guess this is a good one for YouTube



I don't envy your task -- I am imitated by surface-mount anything. Specialized equipment is required.

During manufacture -- the parts are loaded using robotics and then flow-soldered as a unit. Apparently, the device you are working on would have benefited by a hole-through version of the multi-pin connector. Looking at your photos it seems to me that you can clean the pads and connections of solder -- set the connector in place and hand solder each pad individually with a solder pencil.

I would wear a jewelers bi-optic magnifier to get a close look while working. I believe you can pull it off. Once you solder tack the first pin -- that will anchor the connector which will enable working on the rest of them. I think if you try to re-flow them as a group you may still end up with cold joints that will not be reliable.

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