11/11/2012, 07:29 PM
I opened my HP TouchPad 4G to install a Sierra MC7700 MBM in place of the stock Ericsson F5521gw MBM. Based on my experience, the following are some suggestions that supplement the instructions on iFixit (HP TouchPad Repair Manual - iFixit) for opening your TouchPad 4G for service. Disclaimer: You can damage your TouchPad 4G by opening the case and should only do so if you are willing to take this risk!!! Also, note all the cautions in the iFixit instructions.
1. Note that The HP TouchPad 4G case is slightly different than the HP TouchPad WiFi case. The 4G has eight (8) clips instead of seven (7) on the WiFi. (see red boxes on Photo 1).
2. The plastic clips are "J" shaped and are held in a pocket the back case by a small plastic tab. It is very easy to damage the clips when you open the case. When I opened my case, I broke off the small plastic tab that held the four (4) clips in the back case along the volume rocker side (see red box on Photo 2). I was able to superglue the clips to the back before re-assembly. If you do so, be careful to get them fully seated over the locating pin (see red box on Photo 3).
3. The "J" clips fit into a shallow slot on the side of the screen assembly and the key to limiting damage is to 'pop' them free by pulling top of the clip outward from the screen as you work around the case with your flat metal spudger as shown on the iFixit instructions. Here are some hints that may help you avoid damaging the clips:
- Use a bright work light to illuminate the clip area. Consider using magnifying glasses so you can see the details clearly as you work.
- Free each clip as you work around the case from Clip 1 to 8, starting with inserting your metal spunger between the USB connector and Clip 1. They should be released long before they are as far above the back case as is shown in the iFixit pictures.
- As soon as the top of each clip is visible, you should pop it free. TTB has used a guitar pick to leverage it out from the top. For me, it was easier to slip a dental pick (like one of those shown in Picture 4 with a straight pick) between the top of the clip and the side of the screen and pop it free by pulling it away from the screen.
4. Once you free the clips, you can tilt the screen up (there may be some sticky adhesive) and pull it out toward the volume rocker side to free the tabs that slip under the speaker side corners (see green circles on Photo 1). You will need to disconnect the red antenna lead from the MBM and then you can lay the screen back. Or you can remove it completely as shown in the IFixIt instructions.
5. If you are replacing the MBM, it is covered with adhesive-backed shielding foil that will need to be carefully cut around the edges of the MBM module, Then you can remove the black antenna lead and remove the two screws (one with a clip), raise the end of the MBM, and slide it out of the socket.
Thanks to TTB for his assistance.