To do further examination, if the fault detection is often bright orange lamp, only backlight failure may be great damage to the touch screen can be observed first touch screen lamp fault detection, if cannot enter the offline mode, said the touch screen has a backlight lamp burned. If the fault light is green, it needs to be replaced by a new touch screen. The three sides also click on the touch screen angle (each kind of industrial touch screen into the connection mode in different ways this method is only applicable to Proface touch screen) to try to enter the offline mode, show that the touch screen touch function is intact, if able to successfully enter the