There are various reasons why someone may want to disassemble their handset. Whether it is to try and replace a damaged screen or even to change the internal battery, in the case of the Sony Xperia S. We would recommend any user to think long and very hard before attempting to open their phone, but if you’re curious then we have the guide for you.
XDA.cn went through the arduous process of detailing the step-by-step process in taking your Xperia S apart. We are reproducing the guide here to bring this information to the wider English-speaking Xperia community. If you are thinking about taking your phone apart, please read the instructions carefully and if you get stuck don’t force anything. Check out the full guide after the break and the XDA.cn disassembly video below.
Xperia S Disassembly Guide
[The Xperia Blog absolves itself from any responsibility should you decide to carry on and you break your handset. Please proceed with caution and at your own risk.]
Step 1: To disassemble the Sony Xperia S, you will first need the right tools. A Torx 6 screwdriver and tweezers are a must.

Step 2: Removing the back cover gives access to the micro SIM card slot. Unfortunately the battery is sealed, but we’ll show how you can get reasonably easy access to it.

Step 3: Given the large chassis there are quite a few screws to remove. Make sure you also remove the screw near the camera.

Step 4: In total, there are nine screws and they come in two colours which determines their location.

Step 5: Once you remove all of the screws, you can prise open the shell. This is the first step to dismantling the phone.

Step 6: The shell is also connected to a cable and the integrated NFC module. Be careful to disconnect it.

Step 7: Here you can access the battery – as you can see it resembles the batteries that Sony (Ericsson) has used in the past.

Step 8: The 1750mAh battery can be easily removed and replaced if needed.

Step 9: Here is the battery on its own, showing the minimum 1700mAh capacity.

Step 10: The next step is to remove the 12MP back-illuminated camera.

Step 11: The camera cable is very fragile so please proceed with caution.

Step 12: This is the front of the camera once removed.

Step 13: This is the back of the camera.

Step 14: Once you remove the camera you can access the phone’s tiny motherboard.

Step 15: Some further screws need to be removed to get access to the transparent section of the handset.

Step 16: This chip controls the transparent light functionality.

Step 17: This is the cable connection at the bottom of the electronic components.

Step 18: The bottom belt (housing the transparent element) is very fragile and needs to be removed with great caution.

Step 19: Once done, you will be able to completely separate the bottom part of the phone.

Step 20: Here you can see the metal connections in the middle of the belt that controls the antenna.

Step 21: The antenna can be seen in a grid fashion through the transparent bar of the phone.

Step 22: Once you open the motherboard cover you can see the Qualcomm chipset.

Step 23: The front camera is integrated directly on the motherboard, this is relatively rare when it comes to smartphones.

Step 24: Here you can see the back of the Toshiba memory. The read and write speeds of this module are very fast.

Step 25: This is the micro SIM card slot.

Step 26: Finally, here we have the phone and all of its accessories laid out in all of their glory. Well done if you managed to get this far!

Via XDA.cn.
Thanks Guddu!