It was necessary to use a touch LCD screen, but it was discovered during the course of use that the LCD touch screen was not sensitive and had a slow reaction time.
1. First determine whether or not the connection interface is loose.
2. Next, determine whether the serial port and interrupt number are in conflict. If there are conflicts, you should adjust your resources to avoid them.
3. Inspect the touch screen's surface for cracks and replace them as soon as possible. It is also necessary to check whether there is dirt on the surface of the touch screen and if there is, wipe it away with a soft cloth.
It's off.
4. Observe and verify that the indicator light on the control box is functioning properly. If everything is working properly, the light is green and blinks.
If all of the above components are in good working order, you can replace the control box first, then the touch screen, and finally the host to check the touch screen.
It is possible to distinguish between capacitive LCD screen and resistance LCD screen, which can be evaluated according to their own situation:

The following maintenance procedures can be carried out on the resistance LCD screen:
1) Verify that the connecting wire of the touch screen is properly connected, as well as that the connecting wire of the keyboard port of the upper computer is properly connected (the working voltage of the touch screen is the key) Plate mouth 5 volts).
Please double-check the cable.
2) Keep an eye on the status of the touch screen control box light. If the light is not on or is flashing red, the control box is faulty. Replacement is required.
3) If the above-mentioned situation cannot be confirmed, please delete the touch screen driver, restart the computer, and reinstall the driver, or replace the old driver with the new version.
4) If there is a conflict between the device in the host and the serial port resources, check the hardware device and make the necessary adjustments. For example, after installing some network cards, the default network configuration may be changed.
The IRQ of is 3, which is in conflict with the IRQ of COM2. The IRQ of the network card should be set to Idle IRQ. Most likely, a computer motherboard and touch screen were used.
Control boxes are not compatible with each other. Please replace the main engine or the mainboard.
5) If some areas of the touch screen cannot be touched after a long period of time (3-4 years), the touch screen may be damaged. Please replace the touch screen.

The following types of maintenance can be performed on a capacitive LCD screen:
1. custom LCD touch screen has a long response time
The touch screen, specifically the finger touch screen that is used behind the scenes, takes a long time to respond.
The reason for this is that there may be moving water droplets on the touch screen.
Wipe it down with a soft, liver-dry cloth. It is also possible that the host is set too low, for example, by setting the clock frequency too low.
In this case, it is preferable to replace the main engine.
2. The sunlight readable LCD touch screen has no local response.
The use of a touch screen is encouraged. There was silence somewhere behind the touch screen.
The reason for this is that the touch screen's reflective strip may be partially covered.
You can remove it with a dry, soft cloth. It's also possible that the reflective strip on the touch screen is damaged.
The object has a partial scratch on it that cannot be repaired.
3. The LCD touch screen was fine, but the computer did not work for some reason.

The touch screen test is normal, but the computer will not run after it has been connected to the host.
It is possible that before the host begins loading the touch screen driver, the touch screen control card receives the operation signal and simply needs to shut down and then restart the power supply.
The brain has the ability to be. It is also possible that the touch-screen driver version is too old and that you need to update to the most recent driver.