Even though you got an instruction on hand, the replacement of touch screen couldn’t be done by anybody. If you are a rookie in repair work, you’d better take it to a TV repair shop or computer repair shop that has the equipment to do this type of soldering. If you have experience in soldering, or know someone who is, the following tips will be helpful for you during replacement installation.  

1. Preparing a soldering set, DIY repair tools, heat gun and a piece of white cloth/towel/paper. As the connections are extremely small, I suggest you use a temperature controlled soldering set with a micro soldering iron. Please don’t do it with a soldering gun, coz it is almost impossible to solder with a pencil. What is more, I recommend do the replacement on a piece of white cloth/towel/paper, as not to lose any tiny parts, such as screw, volume switch, speaker, button etc.

2. Removing the back of housing case. Turn over your Sciphone, take off the battery cover case. Then take out the battery, sim card and micro SD card. Unscrew the two screws on both sides at the bottom. There are two snap pins on both sides close to the middle. You could just pull inside outwards and they will release and pull up. You also could use a plying tool gently to get them out. Pay attention to the volume switch and the antenna connector, and make sure you would lose them.

3. Separating the motherboard from the chrome metal bezel. After removing the back of housing case, you will find the motherboard in green color. There are two snap pins holding the motherboard in place with the front frame panel. One in the top left, while the other in the bottom right. You have to pull them and separate the motherboard from the chrome metal bezel. You may also pry it with DIY repair tools.

4. Unsolder the broken touch screen After separation, please take the speaker and button out, and keep them on the white cloth/towel/paper. Then unsolder the four wire flex cable of broken touch screen. Get a heat gun on hand, if not, a hair drier is ok too, just the broken touch screen. The glue on chrome metal bezel will be melted down. Then you could remove the broken one easily.

5. Solder the new touch screen Get a new touch screen on hand, and remove the protector film on the back side. Some of them come with sticky tape, which you could stick it to the chrome metal bezel. If not, you have to glue it yourself. If you get to this far, please solder the new one carefully. As the contacts are extremely small and delicate, make sure you wouldn’t get any short circuit or any components burnt.

6. Reassemble the phone After replacing the touch screen, please don’t be hurry to put on the case and other components. Turn on the phone, and try the touch screen firstly. If it works fine, then you could reassemble the phone step by step as you separate it.

source: http://forum.gsmhosting.com/vbb/f457/how-replace-touch-screen-digitizer-sciphone-i68-i68-4g-i-1214186/

Friendly Tech. Guide by Vkamobi: Sciphone i68 touch screen Sciphone i9+++ touch screen Instruction Video on youtube