Xperia T touch screen not working after update

[TheManco]

I updated my phone to 4.3 a week ago.  At the beggining when i tried to unlock the phone (i have an unlock pattern), the screen didn't work properly, but after i could unlock everithing was ok. But now the i cant even unlock the phone, beacause the screen doesn't respond at all. I tried hard reset by pressing power button and the volume up. I cant even use the pc repair kit since i cant unlock the phone. Also i noticed that when the phone is turning on,  there is a moment, when there are coulorful lights crossing the screen in which the phone vibrates. 

Need help please!

[Uliwooly]

test your phone with 

https://play.google.com/store/apps/details?id=com.sonymobile.androidapp.functiontester

[TheManco]

My touch screen is not working. I used your program as you suggested with a mouse, but the touchscreen still doesn't work

[Uliwooly]

Then you will have to contact your local Sony repair center

http://www.sonymobile.com/global-en/support/contact-us/

[Jake-SonyXperia]

Hi TheManco,

Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

With the information supplied, you can perform a software repair on the handset, this is done with the handset turned off, you will not connect it until it asks you to do so. Try the instructions below with the handset off and not connected.

To repair the phone software

1.     Install PC Companion on a Windows PC from Support 

2.     In PC Companion, under Support Zone and click Start. 

3.     Under Phone Software Update, click Start.

4.     Click repair phone.

5.     Follow the on-screen instructions. 

I hope this helps.

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[TheManco]

I already have done that and the touch screen is still not working. Im starting to think that maybe is a hardware problem.

[Uliwooly]

You should stop by a Sony repair center

http://www.sonymobile.com/global-en/support/contact-us/

[Jake-SonyXperia]

@ TheManco,

I agree with Uliwooly, I suggest contacting Sony Mobile directly using his link, they will be able to advise where the closest service centre is for you.

I apologize for this inconvenience.

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[HAKO-1]

is not a hardware problem, I have the same problem, I look for weeks for a solution and the only solution for now is go back to 4.1, you will see how the touch works again

[jerom1234]

resseting the phone helped at my phone