LG SIM holder solder tab damage

Question

LG G5

LG's flagship smartphone, with a unique slide-out battery and detachable I/O module supporting multiple hardware expansion options. Released in April 2016.

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Ris @ris50

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Postado: 23 de out de 2018

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LG SIM holder solder tab damage

Hello everyone im new here. I had a problem in the LG G5 Sim holder tray the gold pins was damaged and i wanted to replace myself and fix by buy new sim tray and solder it. I had watch the similar video from YouTube for replace it. I had remove the sim with hot air and flux but i pull by force and the silver contact pads break off. I read and tried to scratch and reveal a copper near the empty tab and fill with solder paste and some with solder rod. After i put the new sim holder it doesn't work the sim and the sb card. Before sd was working but no sim. Do i must clean all and remove with solder wick and buy silver conductive adhesive to fill the empty tabs?

check here

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Minho @refectio

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Postado: 23 de out de 2018

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Kudos for trying a micro-soldering repair!

The trick with lifted pads is to create some tiny jumpers. You had the right idea with scratching the adjacent trace but the solder won’t hold on to anything if you just apply solder paste to the hole that used to have the pad.

You need to create a link between the trace and the pad you are trying to rebuild. The problem with this approach is that sometimes the jumper is so short that when you solder the device on it, the jumper moves around and can disconnect. The trick is to use a UV-curable solder mask as that resists heat (epoxy doesn’t work) so that the jumper will be held in place while you solder the device onto it.

Check out an examples below:

UV-Curable Mask not applied (yet)

UV-Curable Mask applied

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hi and thank you for reply. the problem is the pcb dont have any link to create as your example. its a square blank pcb without anything to link on that

23 de out de 2018 por Ris

i have put an image to check.

23 de out de 2018 por Ris

what im afraid is the squares even if i have put solder doesnt connect well and as you see in image there is mask.

23 de out de 2018 por Ris

i read about silver conductive adhesive that is used for replace pulled off connectors. is that what need to be conductive with the gold sim pins when i will solder or to put uv curable mask?

23 de out de 2018 por Ris

That means the connection is coming from underneath the pads, from an inner layer. Unfortunately, there are no schematics or boardviews for the G5. You can try probing around in the hopes that you will fidn where it connects to. Or you could try scratching down a bit in the board to access the via. This will not be an easy repair if it can be repaired at all.

23 de out de 2018 por Minho

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hi and thank you for reply. the problem is the pcb dont have any link to create as your example. its a square blank pcb without anything to link on that — Ris
what im afraid is the squares even if i have put solder doesnt connect well and as you see in image there is mask. — Ris
i read about silver conductive adhesive that is used for replace pulled off connectors. is that what need to be conductive with the gold sim pins when i will solder or to put uv curable mask? — Ris
That means the connection is coming from underneath the pads, from an inner layer. Unfortunately, there are no schematics or boardviews for the G5. You can try probing around in the hopes that you will fidn where it connects to. Or you could try scratching down a bit in the board to access the via. This will not be an easy repair if it can be repaired at all. — Minho

LG G5

LG SIM holder solder tab damage

Update (10/23/2018)

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