New LCD Screen Touch Malfunction - Sony Xperia XA Ultra Questions & Answers

My Dear friends, I got a Xperia XA Ultra from a friend, display was damaged. So I purchased a New Display with Touch from a Local Shop, but i noticed touch is not working properly, ghost touch on top and bottom of the display. Then i went to the shop and asked for a replacement LCD and they gave me another new LCD. I checked the lcd at shop with the sony *#*#service#*#* code.. and all the touch screen tests were Pass. But after i came back to home and used the phone for 2, 3 hours and again suddenly ghost touch started on top, bottom.
Anybody had same issue like me??? If yes, what is the solution????
Also i want to know Is there any Touch control IC or chip on the phone Motherboard that cause ghost touch????
Please help me regarding this issue.
Thank you.

bump.. anyone???

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To all future readers. I found out what the problem was. Basically,
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See the picture attached
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Hi Johnboy
I cant remember the price of the digitizer offhand but make a check on ebay.. that is where i got it.
Difficulty is high as you need the minature tool set to do this effectively and a gentle touch.
However, it still appears as though the screen I bought has less colours.
Sorry to jump in and unintended hijack
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Hi,
I cracked the screen on the Sony Xperia Z ultra. I bought an LCD screen and touch screen separately. I have installed both the lcd and the touch screen digitizer very carefully and correctly.
The lcd screen works fine however I cannot get the touch screen to work. There is no response to touches. I have not bonded them together or placed any tape between them. Is it possible the touch screen is faulty or does it have to be bonded to the lcd screen? What I am missing here.
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hello, I have the exact same problem, have you found a fix?
Solved:
rob54321 said:
Hi,
I cracked the screen on the Sony Xperia Z ultra. I bought an LCD screen and touch screen separately. I have installed both the lcd and the touch screen digitizer very carefully and correctly.
The lcd screen works fine however I cannot get the touch screen to work. There is no response to touches. I have not bonded them together or placed any tape between them. Is it possible the touch screen is faulty or does it have to be bonded to the lcd screen? What I am missing here.
Thanks,
Rob
Click to expand...
Click to collapse
Hi after trying everything with hardware and running out of options I decided to flash the stock rom again just to see what happens. When I booted everything worked. The touch screen behaves normally now. I guess some software must have been corrupted. It may not be necessary to flash the rom again, it may just require a factory reset. I didn't try this but it may suffice.
I hope this helps someone.
Rob

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