Introduction

  • I wanted to try out Android and get a cheap device so I got me a damaged Galaxy Tab 2 (16GB 3G) from some popular online auction site.
  • Device was being described as damaged SIM slot, but can be switched on. So I was hoping I could revive the full functionality again.
  • Luckily it worked out although it´s something for people with good eyesight and steady hands.
  • Seems like several damaged GT-3100 (or similar) out there because of damaged 3G SIM-Slot.
  • Using Adapter for Smaller-Than-Normal SIM cause broken/bent pins in SIM-Slot when removing Adapter/SIM.
  • Opening the device and replacing SIM-Socket is not very difficult.

Parts

Image 1/3: Open device with plastic opening tool around the edges. Work slowly, avoid sharp metal opening tool or at least do not rotate to avoid marks. Image 2/3: Location of noses on bottom cover Image 3/3: Note on the top and bottom side of device, the noses protrude from the display side into the back cover...
  • Place device face down on cloth to avoid scratches

  • Open device with plastic opening tool around the edges. Work slowly, avoid sharp metal opening tool or at least do not rotate to avoid marks.

  • Location of noses on bottom cover

  • Note on the top and bottom side of device, the noses protrude from the display side into the back cover...

  • while on the sides of the device, the noses protrude from the back cover into the display side.

  • So you have to push the back cover somewhat inwards on the top and botttom side while kind of pulling it out on the sides.

  • Marks on plastic can somewhat be removed by pressing material back.

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Image 1/2: Image 2/2:
  • Detach Battery (black connector) by lifting connector carefully up with finger or non-metallic tool.

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Image 1/3: Remove Battery Image 2/3: Detach all flex connectors (careful not to rupture cables). There are eight connectors which are very delicate. '''Be very careful''' Image 3/3: Detach all flex connectors (careful not to rupture cables). There are eight connectors which are very delicate. '''Be very careful'''
  • Remove screws (11) of main PCB/Battery

  • Remove Battery

  • Detach all flex connectors (careful not to rupture cables). There are eight connectors which are very delicate. Be very careful

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Image 1/1:
  • Remove main PCB by lifting it up carefully from the side thats away from connector first. Be careful not to rip off the flex cables that are always bending back.

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Image 1/2: SIM Socket Image 2/2: Micro-SD Socket
  • One the flip side of the main PCB is the micro-SD and the 3G SIM-socket. Use soldering iron to remove the damaged socket. As with lead-free solder, higher heat is necessary. One can use traditional solder to decrease the temperature necessary. (Add more solder first, then remove with solder wick)

  • SIM Socket

  • Micro-SD Socket

  • The old socket is damaged anyway, so DO NOT try to get it off in one piece. Instead desolder pad by pad and carefully bend the holder up. Do not apply much force. Especially the 8 pads at the PCB edge are delicate.

  • Clean solder residue and make sure no leftover solder is on the pads.

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Image 1/3: The Socket has eight signal pins at the card-inserting side, several pads for shield and two pads at the rear side for SIM-inserted detection. Image 2/3: Place socket on the board and solder at one shield edge first to make a stable position. Image 3/3: Now solder the eight signal pins at PCB edge. Use steady hand or something to steady your hand. If you bridge some pins DO NOT PANIC, use solder wick to remove additional solder.
  • When new SIM-socket arrives, optionally add solder to the pins first. I had a socket that did not solder well due to oxidization. Especially the eight small signal pins must have good connection.

  • The Socket has eight signal pins at the card-inserting side, several pads for shield and two pads at the rear side for SIM-inserted detection.

  • Place socket on the board and solder at one shield edge first to make a stable position.

  • Now solder the eight signal pins at PCB edge. Use steady hand or something to steady your hand. If you bridge some pins DO NOT PANIC, use solder wick to remove additional solder.

  • Use magnifying glass or microscope if necessary. I used both because the contact area of the signal pads is tiny and even if it looks ok, it might not have contact to the PCB.

  • Before soldering all shield pads, check if system is working ! I had to re-solder the socket three times because of corroded pins.

  • One can test the device OPEN (but with PCB and battery in place) to see if 3G works. Beware that WiFi is bad because no antenna (Antenna is on back cover)

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Image 1/3: Connect all flex connectors Image 2/3: Put all screws in place Image 3/3: DO NOT CLOSE COVER
  • If everything works, put back PCB with dock-connector first in.

  • Connect all flex connectors

  • Put all screws in place

  • DO NOT CLOSE COVER

  • Test function again with cover OPEN. Test 3G ON/OFF several times. Especially when screws are tightened !

  • WHY ? Because I had to UNTIGHTEN some screws, otherwise 3G SIM would repeatedly fail. I have not found out why. So I have placed a spacer between PCB and case around SIM-Slot. This should hopefully not happen to anyone else ;-) Should you need the spacer, be aware that the spring contact between PCB and 3G antenna needs to be widened a bit

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Image 1/1:
  • Close back cover by putting device face-down on CLOTH and applying careful pressure on back cover. One click after another. (SIM and MicroSD must NOT be inserted while doing this !)

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Conclusion

Hopefully everything worked out for you and you´re now a proud owner of a revived Tab

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Thomas Widmaier

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