Samsung galaxy s3 touch screen not responding

SOURCE: samsung s5233 touch screen not working

There is a simple answer to this and that is to replace the phones digitizer or touch screen and your problem solved.

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SOURCE: MY SAMSUNG GTS5233A'S TOUCH SCREEN IS NOT RESPONDING TO TOUCH.

Hi,

The mobile screen would have been damaged or a device connected to your screen my be defected .Try to remove your touch screen safe guard sticker then clean the display. If this doesn't work out for you consult your dealer for replacement of new display.

Thank you !!

SOURCE: My samsung tocco lite's touch screen has stopped working

It needs an update, mines done same thing! you gotta find an upgrade online or take 2 shop and they send it off for you, its annoying i know. x

SOURCE: my samsung touch screen isnt

If your touch screen is not working, theres just 2 major causes of such, either a hardware cause which might be either the phone falling on a hard object or in water which could damage the sensor board and either the screen is malfunctioning and needs to be calibrated.
If you can access the menu of the phone, i will advice you calibrate the screen first before you send it to a repair shop. There is no updates to download for such problem as updating the firmware of the phone would do nothing but change the settings of the phone.
To calibrate the screen, you will have to go to the phones menu, go to settings, then you select the calibrate screen, it will show you some stars to touch and once you touch them properly, then your screen will be able to work effectively.
But if you cannot access the menu because of the touch, then i will advice you send it off for repairs, and what to repair on the phone is the sensor board.
Hope this helps you.