Carefully separate the plastic shell. You will see three main pieces: the plastic casing, a rubber button keypad, and a green fiberglass circuit board.
on the back of the remote and remove both batteries.
If only specific buttons are not working, the internal conductive pads might be dirty or worn: tv remote dax ne 190e fixed
Digital camera sensors can detect infrared light that is invisible to the human eye. Open the camera app on your smartphone and point the front-facing camera directly at the IR emitter bulb at the top of the DAX NE-190E. Press several buttons on the remote while looking at your phone screen.
If your remote has "lost" its connection to the TV, use one of these common setup methods: Turn on your TV manually. Carefully separate the plastic shell
Point the remote’s front LED at the camera lens and press a button.
Click.
Remove the batteries completely. Press and hold the physical Power button on the remote for 30 consecutive seconds. This drains the residual electrical charge from the internal capacitors and resets the microcontroller.