Is your remote broken? Or is it just that the batteries have run out? Your smartphone camera can help you answer these pressing questions.
Smartphones, in most cases, can detect infrared light emitted by remote controls. The user should just open the camera app and point the sensor towards the infrared diode on the remote control.
According to the German News Agency (dpa), when you press a button on the remote, infrared light will appear on the smartphone screen in the form of a quivering white or purple dot.
If you do not see a flickering dot, or it is very, very dim, then you probably need to change the remote's batteries.
If the dot is strong, then something else is wrong. However, this does not work with all smartphones.
If nothing happens on the screen, try switching from the main camera to the front-facing camera.