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Part of touch screen not responsive

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ccheung
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Default Part of touch screen not responsive

I have new stock 20a 4.2.2. Then I OTA upgraded to 4.4.2 20d without problem. I used Towel root to root the tablet. The table works fine up to this point. Then I installed TWRP and installed custom ROM. Since then the top part of touchscreen is not response. I used LG mobile support tool to rollback the tablet to stock 20d. But the problem still exists. Any clue?

One side note. I also applied wet screen protector after I installed TWRP. At first I thought it was the problem of the screen protector, but I have peeled it off but the problem still exists.
 
aicjofs
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Originally Posted by ccheung View Post
I have new stock 20a 4.2.2. Then I OTA upgraded to 4.4.2 20d without problem. I used Towel root to root the tablet. The table works fine up to this point. Then I installed TWRP and installed custom ROM. Since then the top part of touchscreen is not response. I used LG mobile support tool to rollback the tablet to stock 20d. But the problem still exists. Any clue?

One side note. I also applied wet screen protector after I installed TWRP. At first I thought it was the problem of the screen protector, but I have peeled it off but the problem still exists.
I seem to remember a post in the accessories section about screen protectors and someone applied a wet style one and had the same or similar issue. I think they let it dry out for a couple days. The general consensus is the gpad is sealed very well.
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