LG SIM holder solder tab damage

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LG G5

LG的旗舰智能手机，具有独特的滑出电池和可拆卸的I/O模块，支持多种硬件扩展选项。发布于2016年4月。

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Ris @ris50

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发帖于: 2018年10月23日

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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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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

由 Ris 完成的 2018年10月23日

i have put an image to check.

由 Ris 完成的 2018年10月23日

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

由 Ris 完成的 2018年10月23日

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?

由 Ris 完成的 2018年10月23日

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.

由 Minho 完成的 2018年10月23日

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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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