What do you mean by 'does not discover signal'? If it is a problem with pairing, I have both the K380 and the S5e, so can offer some advice. To pair it, turn the keyboard on and hold one of the 3 Bluetooth buttons until the light above it starts flashing. Go to the Bluetooth settings on the tablet and select the keyboard. A pop-up will appear on your tablet with a pairing code. Type that code into the keyboard then press enter. If your tablet is not detecting the keyboard in pairing mode, is the keyboard new, and have you tested it with other devices?