[Touch screen circuit problems generally cause touch screen failure, the specific maintenance methods are as follows] :
First, check whether the touch screen cable is dirty or in poor contact with the interface on the mainboard. If the cable is in poor contact, reinstall the touch screen interface. If the interface is damaged, replace the interface.
(2) Next, check whether the soft cable of the touch screen is damaged, broken or small, if so, replace the cable.
(3) If the above interface is connected properly, then measure whether the 2.5V power supply voltage of the touch screen circuit is normal (generally, directly measure the voltage of the filter inductance and filter capacitor end of the power supply circuit). If the power supply voltage is abnormal, check whether the filtered capacitor and inductor in the power supply circuit are welded or damaged.