To start, i will point out the relevant specifications of this smart phone, the Sony Z1 Compact (D5503):
- Launched: January, 2014
- Dimensions: 127 x 64.9 x 9.5 mm
- Weight: 137g
- Display size: 4.3″
- CPU: Quad-core 2.2 GHz Krait 400
- GPU: Adreno 330
- Camera: 20.7 MP, LED flash
- Battery: Non-removable Li-Ion 2300 mAh battery
Problem presented: The cellphone in less than two months of use started to have the “Ghost/Phantom touch” problem. See this video:
It was useless after trying the calibration methods. The phone user tried to disassembly the lcd by himself but broke some borders of the lcd and a signal connection of its back. After that, a new lcd was installed but it was unresponsive.
Before trying to do a disassembly or hardware fix, it is better to discard and run out any software fix.
Since, even Sony officially reported issue with Z1/Z1s touch screens and a fix would be released with Android 4.4 update. See here.
Follow this steps to verify the software:
- Download Sony Companion software.
- Do a backup to your computer of all your important files/photos/videos/contacts. Everything you think it is valuable for you. This is in case the update fails or the update doesn’t go out smoothly.
- If the software tells you there is an update, do the software update. If you already have the latest version, go to next step.
- Do a software repair. This will erase all your data, so do step 2 first.
- If the problem persists, let’s go to try with the hardware.
The following video is a disassembly of the phone back part in case you need it. You don’t need to do this. Only for reference.
We need to follow this video to disassembly the lcd. Take note that the glue is located around the borders and most at the top and bottom part. There is no need to heat the center.
Disconnect the lcd from the flex connector using a plastic tool.
We must check this flex connection located at the back of the LCD. This figure 2 shows that the connector was separated from its board (this is the broken LCD). This happened due to a bad disassembly.
After doing the replacement for the new LCD. I turned on the phone and discovered that the screen was totally unresponsive. So i turned off and checked the LCD again. The problem was that this flex connection of figure was not properly connected.
So, using a plastic tool, lift the connector up (black part) as seen in figure 4. You must lift it from the opposite side of the connection.
After that, disconnect carefully the cable and connect it again very carefully. Verify that the whole terminal (pins) are totally inside the connector. And lift down the connector (black) securing it. Connect the LCD to the main board and turn on the phone to test it.
Finally, the LCD was working normally. So, I tried for a few days before glueing it.
Disclaimer: All youtube videos aren’t mine. They are property of their respective authors. But all the photos are taken by me.