When I activate TalkBack the touchscreen seems to stop responding, what could be the issue?
It is understandable to think there could be a problem with your handset, however, this is normal when TalkBack is activated.
Please see the guide below
How to use
You will actually need to use two fingers when scrolling.
1) First tap > yellow rectangle showing that the menu option is marked
2) One tap> doesn’t do anything
3) Double tap > actually selects the menu
*If you are unable to see the tutorial, then you will need to clear the TalkBack data. Head back to Application Manager and select 'clear data'
while in Talkback info. Then, just activate Talkback again and the tutorial will start.