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Released by Samsung in March 2016. Model SM-G930.

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Damaged circuit path/pad on sim socket replacement

Hi,

The memcard/sim socket on my Galaxy S7 got damaged after the sim tray broke and the sim card got stuck, So I tried to do the replacement procedure found here on ifixt.

Unfortunately, during the socket removal I accidentally damaged one circuit path and several soldering points :(

Overview:

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Top:

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Bottom:

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My question is if all of these damaged points are actually used - or if they are simply just holding the socket in place, and if some of the points are actually used, is there any way I could repair this? And how? Could conductive paint be a solution?

Update (03/14/2018)

Below you can see what I think are left from the broken pins;

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Do you think these can be used for soldering?

Update (03/14/2018)

I think I might have double or triple posted my comment, but I really dont understand how this forum and posting works... Sorry

@minho Whats ZXW? Im a n00b at this, but I found a pic that shows what the squares are for:

http://www.u2ugsm.com/blog/wp-content/up...

@oldturkey03 I understand that the conductive paint has to connect to something, but I think there are some leftovers from the broken pins in the square. I updated my post with a closeup. If not - where are the connective circuits? Hidden somewhere in an inbetween layer of the board?

What do you mean by "shields"? I understand the meaning of the word, but not in this context. The sim socket? Or shield from outside noise, like a shielded cable?

Update (03/15/2018)

Thx for the help guys.

@Minho Did you look at the pictures from yesterday? If you look really close you will see what appears to be something metallic on the squares. Today I used a voltmeter to see if there is any connection between the metal bits and the points where the circuits leads , and it was. Do you still think Its a super hard repair, or could I continue to put the sim socket back on? If I manage to fix the outside pads.

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@oldturkey03 thx. If I was to send it in for repair I should have done it before I opened up the phone and removed the sim socket... To get it fixed now will probably cost about as much as the phone is worth. A better alternative is to buy a new motherboard from ebay I guess.

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@micke_wth you tore quite a few solder pads off. The square ones are all being used whereas the rectangle ones are for the shields. There is no schematic as for where you could connect jumper wires etc. This will be a very difficult repair. No, conductive paint does not work. It has nothing to connect to. I'd suggest you find somebody who specialises in microsoldering/boardlevel repair to get it evaluated. @refectio might be a good start.

Update (03/14/2018)

@micke_wth by shield I was referring to an EMI shield. Yes like that "Or shield from outside noise, like a shielded cable"

If you still have some copper where the solder pads were, you can try and either rebuild the solder pad or solder some jumper wires to it. Use the images you found for that idea.

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Whatever your plan is, this is going to be tough. Again, I suggest that this is a job best left to people with good skills and tools.

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I looked at ZXW and the inner square ones are all important (except for one NC). They make contact with the the actual SIM card via the reader. The ones on the periphery are mostly connected together, which in turn are connected to some components in the surrounding area. The square one at the top is connected to something different.

It's probably fixable but not from a DIY perspective, IMHO.

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@ZXW is a "paid version" of the schematic and boardview.

Forget about conductive paint, this won't do the job. All of the pads underneath the reader have to be rebuilt. While not impossible to do for a solid DIY'er, you risk doing further damage to the board more than anything else unless you have the right tools. If you want to try, for the pleasure of trying and don't care about saving the fun, then by all means, I encourage you to try.

If you want to save the phone, you should send it off to a specialist.

- de

@micke_wth by shield I was referring to an EMI shield. Yes like that "Or shield from outside noise, like a shielded cable"

If you still have some copper where the solder pads were, you can try and either rebuild the solder pad or solder some jumper wires to it. Again, this is a job best left to people with good skills and tools.

- de

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