Most peoploe like me find the sluggish and inprecise resistive touchscreen android a bit annoying. I , myself bought one with a faulty touch screen. This is difficult to detect on purchase as we are new to this OS. The virtual keyboard seems working on purchase, but yet the keys on the left hand side of the virtual keyboard seems unable to be pressed correctly persistently. In fact, if you download an apps like Paintpro, you will then find the touching point is 1cm away from the actual pen tip !
Since I am not to sure if that is my problem of incorrect steps of touch screen calibration, I can only make a decision to go back to the shop and ask for a change.
After testing, I confirmed that mine has a faulty touch screen. The shop exchange a "new one" and I test it with Paintpro app to make sure the touchscreen tracking is perfect. Nevertheless, I got a good one.
Since I am not to sure if that is my problem of incorrect steps of touch screen calibration, I can only make a decision to go back to the shop and ask for a change.
After testing, I confirmed that mine has a faulty touch screen. The shop exchange a "new one" and I test it with Paintpro app to make sure the touchscreen tracking is perfect. Nevertheless, I got a good one.
After playing with that for another 3 weeks, the same symptom appear again!
Googling, I found 3 posts regarding : 1) resolved by reloading the firmware , 2) faulty touchscreen
Initially it seems 1) is a better option as the screen works normal for the first 3 weeks. May be I load some apps not compatible, may be I root it,.....
I cannot just put this lovely pad into the rubbish bin. Finally , I decide to investigate. I dare to peel off the protective screen and confirm my finding.
The resistive touch screen compose of 3 layers (the cheap one has only 2) and the 4 pins are sealed together with some glue/bond. I find if I press on one of the pin, the touch screen becomes percise again. Likely the fault results from manufacturing problem results in one of the pin has poor contact between the 2 layers.
Googling, I found 3 posts regarding : 1) resolved by reloading the firmware , 2) faulty touchscreen
Initially it seems 1) is a better option as the screen works normal for the first 3 weeks. May be I load some apps not compatible, may be I root it,.....
I cannot just put this lovely pad into the rubbish bin. Finally , I decide to investigate. I dare to peel off the protective screen and confirm my finding.
The resistive touch screen compose of 3 layers (the cheap one has only 2) and the 4 pins are sealed together with some glue/bond. I find if I press on one of the pin, the touch screen becomes percise again. Likely the fault results from manufacturing problem results in one of the pin has poor contact between the 2 layers.
Then I think how to make a good contact for the pin in the upper and bottom layer as they is no point of soldering.
I repair it by using a soldering gun of low Watt and once it reach the desired temp., I switch off the soldering gun. Then hold it firmly and press on the plastic on the side of the pin. It works like magic and the touchscreen revive again.Steps in repairing your touchscreen:
1) Confirm you can the same problem. The left part of the virtual keyboard does not work properly.The keys like a ,s,w,e cannot be pressed with one touch, it just wander (The reason is that the loss contact add additional resistance to the reading.
2) Try and press/hold on the touchscreen lower left corner,measuring 3.8 to 4.8cm from the left lowest viewable LCD corner. (refer to the photo below)
3) If this cure your touchscreen problem, you can follow as below
4) Peeled off the top screen. This is the most difficult and most destructive part. It may be irreversible!
5) Confirm which oin is loosen but pressing on the pin individually.
6) Apply warm solder to reglue the loose pin.
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The LCD is removed.
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The 4 pin of the resistive touchscreen..JPG)
Use solder gun of low temp and press the side of the pin.****The soldering method is replaced with silver metal conductive paint, which works easier and safer.
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