The following describes some examples of the diagnosis and treatment of touch screen failures.
1 . Touch screen is not allowed
[ Fault phenomenon ]
A surface acoustic wave touch screen that touches the display screen with a finger does not normally perform the corresponding operation.
[ Fault Analysis Processing ]
This phenomenon may be caused by the sound wave touch screen being covered by dust after being used for a period of time. It can be wiped with a dry soft cloth, then power off, restart the computer and recalibrate. It is also possible that the reflection fringes of the sound wave screen are slightly damaged, and if this is the case, it will not be completely repaired.
If it is a capacitive touch screen, the screen calibration program can be run under the following conditions : (Start -- Program -- Microtouch Touchware )
1 ) * Complete the installation of the driver software.
2 ) Every time you change the resolution or display mode of your monitor.
3 ) After changing the displayed display area each time.
4 ) After adjusting the frequency of the controller each time.
5 ) Each time the cursor does not correspond to the touch point.
After calibration , the calibrated data is stored in the controller's registers , so there is no need to calibrate the screen each time the system is turned on.
2 . The touch screen is not responding
[ Fault phenomenon ]
A touch screen does not work and does not respond to any part of the touch.
[ Fault analysis and processing ] Siemens touch screen power-on without display maintenance
First check if the wiring interface is loose, then check if there is any conflict between the serial port and the interrupt number. If there is any conflict, adjust the resources to avoid conflicts. Then check the surface of the touch screen for cracks. If there is any crack, it should be replaced in time. Also check the surface of the touch screen for dirt and, if so, clean it with a soft cloth. Observe that the indicator light on the control box is working properly. When it is normal, the indicator light is green and blinks.
If the above parts are normal, you can use the replacement method to check the touch screen, replace the control box first, then replace the touch screen, and replace the host after the Zui.
If it is a surface acoustic wave touch screen, it can be repaired as follows:
It may be that the connection of the touch screen , one of the connections to the keyboard port of the host ( take the 5 volt touch screen operating voltage from the keyboard port ) is not connected , please check the connection. It may be that the serial port number selected during the driver installation process of the touch screen does not correspond to the serial port number actually connected to the touch screen . Please uninstall the driver and reinstall it. May be the host for the domestic original machine, the operating system is installed OEM versions, manufacturers are adjusted, resulting in non-standard serial communications, and touch screen driver is not compatible drive if possible touch screen format the hard disk, install the system. Check whether the device conflicts with the serial port resources in the host. Check the hardware devices and adjust them . For example, the default IRQ of some NICs is 3, which conflicts with the IRQ of COM2 . In this case, the IRQ of the NIC should be changed to the unused IRQ .
TCT
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