Touchscreen overlay kit are electronic products that people often use now. With the development of intelligence, touch screen electronic products can be seen everywhere in life. For example, the building intercom touch screen used for anti-theft, and the all-in-one touch screen of the inquiry machine used in the community. These are often used in life now.
In the process of use, the touch screen cannot be used due to malfunctions. This is mainly because the touch screen is a relatively sophisticated device. In addition, touch screens are mostly open to the public. The frequency of use is high, and the quality of the users varies. As a result, its faults frequently appear. The following is an introduction to the solutions and maintenance methods of some common faults of the touch screen:
When the touch screen fails, first check whether the power supply of the control card is normal. Whether the Windows driver is installed normally. Then check whether the touch screen calibration under Windows is completed. Whether the parameters in “Touchscreen Control” are correct. Also need to check whether the serial port is normal and whether the serial cable is connected properly.
A touch screen does not work, and there is no response when touching any part.
First check whether each wiring interface is loose, and then check whether there is a conflict between the serial port and the interrupt number. If there is a conflict, adjust the resources to avoid the conflict. Then check whether there are cracks on the surface of the touch screen. If there are cracks, replace them in time. It is also necessary to check whether there is dirt on the surface of the touch screen. If there is, use a soft cloth to remove it. Observe and check whether the indicator light on the control box is working properly. When it is normal, the indicator light is green and flashing.
If the above parts are normal, the touch screen can be checked by replacement method, first replace the control box, then replace the touch screen, and finally replace the host.
1) Check whether the wires of the touch screen are connected correctly.
One of the wires connected to the keyboard port of the host (take the 5V touch screen working voltage from the keyboard port) is connected. Please check the connection.
2) Observe the status of the touch screen control box light.
If it does not light up or the red light is on, it means that the control box is broken, please replace it.
3) If the above conditions are not confirmed.
Please delete the touch screen driver and restart the computer to reinstall the driver, or replace with a newer version of the driver.
4) Whether there is a conflict between a device and a serial port resource in the host, check each hardware device and adjust it.
For example, after some network cards are installed, the default IRQ is 3, which conflicts with the IRQ of COM2. At this time, the IRQ of the network card should be changed to an unused IRQ. It may be that the computer motherboard and the touch screen control box are incompatible. Please replace the host or motherboard. .
5) Touch Screen broken
If the touch screen has been used for a long period of time (3-4 years) and it is found that some areas of the touch screen cannot be touched, it may be that the touch screen is broken. Please replace the touch screen.
A surface acoustic wave touch screen cannot perform the corresponding operation normally when touching the part of the display screen with a finger.
This phenomenon may be caused by the sonic touch screen being used for a period of time, and the reflective stripes around the screen are covered with dust. You can wipe it with a dry soft cloth, then power off, restart the computer, and recalibrate. It is also possible that the reflection stripes of the sonic screen have been slightly damaged. If this happens, it cannot be completely repaired.
1) Complete the driver software installation for the first time.
2) After changing the resolution or display mode of the monitor each time.
3) After changing the displayed display area each time.
4) After adjusting the frequency of the controller each time.
5) Every time the cursor cannot correspond to the touch point.
After calibration, the calibrated data is stored in the register of the controller, so there is no need to calibrate the screen every time the system is started.
A touch screen, after touching the monitor screen with a finger, there is no response in some places.
[Fault analysis and processing]
It is possible that the reflective stripes of the touch screen are partially covered, and can be wiped clean with a dry soft cloth. It is also possible that the reflective stripes of the touch screen are partially scraped off by hard objects and cannot be repaired.
A touch screen, everything is normal after testing itself, but after connecting to the host, the computer cannot be operated.
It is possible that before the host starts loading the touch screen driver, the touch screen control card receives the operation signal, and only needs to restart the computer after the power is turned off. It is also possible that the version of the touch screen driver is too low, and a brand new driver needs to be installed.
A touch screen, after touching the monitor screen with a finger, it takes a long time to respond.
This may be caused by moving water droplets on the touch screen, just wipe it with a dry soft cloth. It is also possible that the host level is too low, such as the clock frequency is too low. If this is the case, the host can be changed in time.
For a touch screen, the touch screen becomes unresponsive the first time after installing the driver.
First confirm whether the touch screen wiring is connected correctly, if not, connect all the wiring correctly after shutting down. Then check whether there is a conflict between the device and the serial port resource in the host, check the hardware devices and adjust them. For example, the default IRQ of some network cards after installation is 3, which conflicts with the IRQ of COM2. At this time, the IRQ of the network card should be changed to idle and unused. IRQ.
A touch screen has no response after it is turned on and used for a period of time.
Check whether the hard disk shutdown is set in the “Display Energy Saving Settings” of Wlndows 9x. The method is to right-click on the desktop, select the “Properties” command, and then select the “Screen Saver” tab from the dialog box, click the “Settings” button, and set the parameters except for “Power Plan” to “Always On” In addition, the rest are “never”.
In some applications, due to the poor grounding performance, a large amount of static electricity will be applied to the enclosure of the control box, which will affect the working electric field inside the control box and cause the touch to gradually fail. At this time, use a wire to ground the control box shell and restart it.
Because the surface of the surface acoustic wave touch screen is full of sound waves when it is working, if the touch screen is not wiped for a long time, it will cause excessive dust to accumulate and block the reflection stripes of the wave, which will cause the touch screen to not work properly.
For touch monitors, use clean business cards or banknotes to gently wipe off the dust on the surrounding reflective stripes through the gap between the front cover of the monitor and the touch screen, and then restart the computer. For touch all-in-ones, you can open the front cover of the display, wipe off the dust on the surrounding reflective stripes with a clean towel, and then restart the computer.
Many touch all-in-one touch screen control boxes use the method of taking power from the all-in-one power supply instead of the host, so you should also check whether the 5V output of the all-in-one power supply is correct. Sometimes the instantaneous current is too large, causing the fuse to be burned. It is necessary to replace the fuse.
For a touch screen, its click accuracy is reduced, and the cursor is difficult to locate.
Start–Settings–Control Panel–Sonic Screen—Caliberate Button
If it is a newly purchased touch screen, please try to delete the driver, and then power off the host for 5 seconds to reinstall the driver.
If the above method does not work, it may be that the reflection stripes of the sonic screen were slightly damaged during transportation and cannot be completely repaired. You can deviate from the calibration bullseye in the opposite direction (relative to the direction that deviates from the mouse) equidistantly for positioning.
If the sonic screen is inaccurate after a period of use, it may be the reflection stripes around the screen or the surface of the transducer is covered by dust. If you are using our company’s KA cabinet, you can open the top cover and use a dry one. Clean the surface with a soft cloth dipped in industrial alcohol or glass cleaning fluid, and then re-run the system, paying attention to the upper left, upper right, and lower right transducers not to be damaged. Then power off and restart the computer and recalibrate.
There are water droplets or other soft things sticking to the surface of the touch screen, and the touch screen misjudges that the surface acoustic wave screen is inaccurate due to hand touch, just remove it.
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