"Back" and "Options" buttons are not responding.

Hello, I had to completely replace the screen on my Galaxy S4 T-Mobile version, so I was following a video tutorial from iFixit.com. After completing the procedure, the screen itself shows everything and works perfectly, but the 2 touch buttons (to the left and to the right of the main physical button) are not responding. Can someone please suggest a solution for fixing this, and what could have gone wrong? Thanks ahead!

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Turns out that the little "flex" cable, had a thin layer of plastic (right below its connector) that had to be removed. I also updated the touch buttons firmware, by opening the phone's Keypad and typing in "*#2663#", and then clicking "Touch Key FW update" option. After all this, my phone seems to operate properly again!

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try to restart your device, or the button is probably malfunctioning.

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That was the first thing I tried, but it didn't help.

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Maybe you somehow damage their connections. Try to open it and see if you can find any problem.

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Sveatoslav Gleanco será eternamente grato(a).
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