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At the very start turn your TCL 43S423 TV on by pressing the Power button.
After that select press the Home button to open the main menu.
Next, scroll down and select Settings, then press the Right arrow button to enter.
Then scroll down to System and press the Right arrow button to enter.
Now select About and press the Right arrow button.
Now you should be able to see System info for your TV.
Now press the following sequence on your remote controller: Up, Right, Down, Right, Up.
Then press the Fast Forward button 3 times.
Next, press the Rewind button 2 times.
Finally, press the back arrow on the remote(it's located on the top left just below the power button), this should bring you into the factory menu.