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Common faults and solutions of LCD monitors

In daily life, the application of touch display screen can be said to be very extensive, and touch screen display can be seen in shopping malls, hotels, supermarkets and other places. The existence of the touch screen has brought great convenience to our work and life. In the process of daily use of the touch screen, we will inevitably encounter some problems, such as the touch screen failure, what should we do at this time? Today we will talk about: common faults and solutions of the touch screen method.

If the touchscreen display fails, first check whether the power supply of the control card is normal, whether the Windows driver installation is normal, and then confirm whether the touchscreen calibration under Windows is completed, whether the parameters in “TouchscreenControl” are correct, and whether the serial port is correct. Is normal and whether the serial cable is connected normally. Next, let’s take a look at the common faults of the touch screen with the editor!

Fault 1: The touch screen is not allowed

Fault phenomenon: a surface acoustic wave touch screen, touch the screen of the screen with a finger, can not complete the corresponding operation.

Solution:

1. The first reason for this failure may be that the dust in the air falls on the reflective stripes around the screen after the sonic touch display has been used for a period of time. At this time, you can use a soft cloth, dry it, and wipe the dust off the screen. Then power off, restart the computer and recalibrate.

2. The second reason may be that the reflective stripes of the sonic touch display have been slightly damaged, which cannot be completely repaired. If it is a capacitive touch display, you can run the screen calibration program in the following situations: (Start–Programs–MicrotouchTouchware)

①Complete the installation of the driver software for the first time.

②After changing the resolution or display mode of the monitor every time.

③ Each time the displayed display area is changed.

④After adjusting the frequency of the controller every time.

⑤ Every time the cursor and the touch point cannot correspond.

After the calibration, there is no need to calibrate the screen every time the system is started, because the calibrated data has been automatically stored in the controller’s register.

Fault 2: The touch screen is not responding

Fault phenomenon: Touching any part of the screen with a finger does not respond, and the touch screen does not work properly.

Solution: When this fault occurs, first check the wiring interface to see if there is any looseness, and then check whether there is a conflict between the serial port and the interrupt number. If there is a conflict, adjust it to avoid the conflict. Then look at the surface of the touch screen for cracks and dirt. If there are cracks, replace it. If the dirt is there, wipe it off with a soft cloth. Finally, see if the indicator light on the control box is green and flashing, if it is, it means it is working normally.

If the above items are normal, then you need to check the problem of the touch screen, which can be detected by the replacement method, first replace the control box, then replace the touch screen, and finally replace the host. The following is divided into 3 different touch screens to analyze how to repair:

1. Surface acoustic wave touch display

①Connection problem: It may be that one of the cables on the touch screen connected to the keyboard port of the host computer is not connected, and the connection needs to be checked.

②The serial port number does not correspond: It may be that the serial port number selected during the installation of the touch screen driver does not correspond to the actual connected serial port number, and the driver needs to be uninstalled and reinstalled.

③The driver is not compatible: It may be that the host is a domestic original machine, and the installed operating system is an OEM version, which has been adjusted by the manufacturer, resulting in non-standard serial communication and incompatibility with the touch display driver. If possible, please format the hard disk and drive the touch screen after reinstalling the system.

④The driver version is too low: install the latest driver.

⑤Conflict with serial port resources: The device in the host is in conflict with serial port resources, check each hardware device and make adjustments.

2. Resistive touch monitor

①Connection problem: Check whether the connection of the touch screen is correct, and whether one of the wires connected to the keyboard port of the host computer (take 5V working voltage of the touch screen from the keyboard port) is connected, please check the connection.

②Whether the control box is broken: If the touch screen control box light does not light up or the red light is on, it means that the control box is broken and needs to be replaced.

③If none of the above situations exist, you can delete the touch screen driver and restart the computer to reinstall the driver, or upgrade the driver to a higher version.

4. Conflict with serial port resources: The device in the host is in conflict with the serial port resources, check each hardware device and make adjustments. If the computer motherboard and the touch display control box are not compatible, please replace the host or motherboard.

⑤The aging of the touch screen: If the touch screen has been used for a long time, such as 3-4 years, some areas cannot be touched. It may be that the touch screen is broken and the touch screen needs to be replaced.

3. Capacitive touch monitor

①Check whether the connection of the touch screen is correct. If it is an external box control card, the control box part is directly connected to the cable extending out of the touch screen through the return slot.

②If it is a built-in card type, you need to check whether the jumper is jumped right. Usually the user’s machine configuration is different, and the peripherals used are also different. Therefore, in order to avoid the conflict between the touch screen and the user’s peripherals, MicroTouch provides the jumper description of the control card for customers to choose.

Fault 3: The response time of the touch screen is too long

Fault phenomenon: a touch screen, after touching the screen with a finger, the response time takes a long time.

Solution: This fault is most likely because the moving water droplets stick to the touch screen. The solution is to use a dry soft cloth to dry it. Another reason is that the host grade is too low, such as the clock frequency is too low, in this case, the host needs to be replaced.

Fault 4: The touch screen is partially unresponsive

Fault phenomenon: a touch screen, after touching the screen with a finger, there is no response in some places.

Solution: When this fault occurs, it is very likely that the reflective stripes on the touch screen are partially covered by dust, etc., use a dry soft cloth to wipe it clean. It is also possible that a hard object or the like has partially scraped off the reflective stripes on the touch screen, making it irreparable.

Fault 5. The touch screen is normal but the computer cannot operate

Fault phenomenon: a touch screen, everything is normal, but after connecting to the host, the computer cannot operate.

Solution: This fault is likely to be caused by the touch display control card receiving the operation signal before the host starts to load the touch display driver, just power off and restart the computer. It is also possible that the touch display driver version is too low, and the latest driver needs to be installed.

Trouble 6. After installing the driver on the touch screen, there is no response at the first startup

Troubleshooting: a touch display screen does not respond when the touch screen is started for the first time after installing the driver.

Solution: First check whether the touch screen line is connected correctly, if it is wrong, you need to shut down first and then reconnect all lines correctly. Then check whether there is a device in the host that conflicts with the serial port resources, check each hardware device and make adjustments.

Fault 7. No response to touch after using for a period of time

Fault phenomenon: a touch screen, after normal use for a period of time after booting, there is no response when touched with a finger.

Solution: In the “Display Energy Saving Settings” of Wlndows9x, check whether the hard disk is set to be turned off. Right-click on the desktop, find the “Properties” command, and then see the pop-up dialog box, select the “Screensaver” tab, find the “Settings” button and click, set the parameters to “Always” except “Power Scheme” Except “Open”, the rest are “Never”.

Fault 8: The click accuracy of the touch screen decreases

Fault phenomenon: a touch display screen, its click accuracy is reduced, and the cursor is difficult to locate.

Solution:

①Run the touch screen calibration procedure. (Start–Settings–Control Panel–Sonic Screen–Capberate button).

②If it is a newly purchased touch screen, you can delete the driver, then power off the host for 5 seconds, turn it on and reinstall the driver.

Fault 9: The touch screen cannot be calibrated

Fault phenomenon: a touch screen, the calibration operation cannot be carried out.

Solution:

①It is possible that before the host starts to load the touch screen driver, the touch screen control card receives the operation signal, please power off the computer, restart the computer and re-calibrate.

②It may be that the touch screen driver is installed abnormally, please delete the driver and reinstall it. (Remove from Add or Remove Programs in Control Panel. )

Fault 10: The mouse keeps staying on a certain point of the touch screen

Fault phenomenon: a touch screen, the mouse has been staying at a certain point, unable to move.

Solution: This happens because the touch area of ​​the resistive screen is pressed by the display casing or the cabinet casing, which is equivalent to being touched at a certain point. If the cabinet shell presses the touch area, you can increase the distance between the cabinet and the monitor screen. If the monitor shell presses the touch area, you can try to loosen the screws of the casing.

Fault 11: The touch screen display is unstable

Fault phenomenon: a touch screen, its work is extremely unstable, sometimes it can click normally, sometimes it has no response.

Solution: In response to this phenomenon, you should focus on checking whether each wiring interface is loose, and whether there is a conflict between the serial port and the interrupt number.

Fault 12: The screen of the touch screen is dimmed

Fault phenomenon: a touch screen, the screen is dimmed, and the color is not displayed normally, but there is no problem with the operation.

Solution: The reason for this situation may be that the color mode setting is incorrect under 2000 system operation, or the screen is not released properly because the screws are too tight when installing the touch screen. In it120, if the mouse or keyboard is inserted into the ps2 port, it may also be There will be a phenomenon that the screen becomes dark and cannot display normal colors.

① Right-click on the system desktop, select Properties, enter the Settings-Advanced window, select the S3Gamma plus tab, and then adjust the color.

②Disassemble the cabinet, loosen the screws of the touch screen to see if the color returns to normal, and adjust the tightness appropriately.

③Change the mouse or keyboard of the ps2 to the mouse and keyboard of the usb interface.

Fault 13: The touch screen does not display

Fault phenomenon: a touch screen, the boot is normal, but the screen does not display.

Solution: This fault is probably due to the wiring problem of the screen. If it is an all-in-one machine, the wiring in the screen may be loose or broken. You can re-check whether the wiring of the screen is connected. If it is connected, the screen still does not display. Indicates that the screen is faulty.

Fault 14: An alarm occurs when the touch screen is turned on

Fault phenomenon: The machine alarm occurs when the machine is turned on, and the machine cannot start normally.

Solution: This fault is probably due to the problem of the memory or graphics card, it is not plugged in properly or is broken, and there are many cases where the memory is not plugged in properly. It is best to re-insert the memory and graphics card in turn, and test to see which one is the problem and replace it.

Fault 15: The screen of the touch screen is blurred

Fault phenomenon: The screen appears blurry after booting, but the machine can be used normally.

Solution: This fault is probably caused by the weak connection between the screen and the motherboard. You can check the connection problem, whether it is plugged in correctly, and how firm it is. If the screen still appears, it needs to be returned to the factory for repair.

 

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