Various types of touch screen common faults and maintenance methods

Touch screen is often used in electronic products, it will inevitably be a problem, I believe many people use the touch screen, are encountered in the touch screen can not be used because of the failure of the situation. So touch the screen how to repair these common faults? This article describes the type of touch screen to solve some common problems and maintenance methods for reference.
First, the surface acoustic wave touch screen
⑴ fault one: touch deviation
Phenomenon 1: The position touched by the finger does not coincide with the mouse arrow.
Cause 1: After the driver has been installed, there is no vertical touch of the center of the bulls when the calibration position is performed.
Resolve 1: recalibrate the position.
Symptom 2: Part of the regional touch is accurate, some areas of the touch is biased.
Reason 2: surface acoustic wave touch screen around the sound reflection stripes around the accumulation of a lot of dust or scale above, affecting the transmission of acoustic signals caused.
Solution 2: clean the touch screen, with particular attention to the four sides of the touch screen acoustic reflection stripes clean, clean the touch screen control card should be disconnected from the power supply.
⑵ failure two: touch no response
Phenomenon: When the screen touches the mouse arrow without any action, no position changes have occurred.
Reason: the cause of this phenomenon for many reasons, the following one by one description:
① surface acoustic wave touch screen around the sound waves on the edge of the accumulation of dust or scale is very serious, resulting in touch screen can not work;
② touch screen failure;
③ touch screen control card failure;
④ touch screen signal line failure;
⑤ computer host serial port failure;
⑥ computer operating system failure;
⑦ Touch screen driver installation error.
Solution:
① observe the touch screen signal indicator, the light under normal circumstances for the regular flicker, about once every second flashing, when the touch screen, the signal is lit, stop touch, the lights resume flashing.
② If the signal light is still in the absence of touch, still in a steady state, first check the touch screen need to clean; Second, check the hardware connected to the serial number and the software set the serial number is consistent, and the computer host serial port is working properly.
③ run the drive disk COMDUMP command, the command for the DOS command, run in the COMDUMP followed by spaces and serial code 1 or 2, and touch the screen to see if there is data out. There is data out of the hardware connection is normal, please check the software settings are correct, whether with other hardware devices conflict. If there is no data out of the hardware failure, the specific point of failure to be determined.
④ run the drive disk SAWDUMP command, the command for the DOS command, run the program, the program will ask the type of control card, the connection port number, transmission rate, and then the program will read the relevant data from the control card. Note that the AGC of the X-axis of the X-axis in the lower left corner of the screen is the AGC value of the Y-axis. If the value of any axis is 255, the transducer of the axis is faulty and needs to be repaired.
⑤ After installing the driver for the first calibration, pay attention to observe the details of the system error. “Did not find the control card”, “touch screen is not connected” and so on, according to the prompts to check the corresponding parts. Such as: touch screen signal line is connected with the control card is firm, the keyboard to take the wires are all connected with the host and so on.
⑥ If you still can not rule out, please professional maintenance.
Two, five line resistance touch screen
⑴ fault one: touch deviation
Phenomenon 1: The position touched by the finger does not coincide with the mouse arrow.
Reason 1: ① After installing the driver program, there is no vertical touch of the center of the bull’surf in the correct position;
② The signal line on the touch screen is bad or broken.
Resolution 1: Recalibrate the location; find breakpoints, reconnect, or replace the touch screen.
Phenomenon 2: When not touched, the mouse arrow always stays at a certain position; when touched, the mouse arrow is at the midpoint of the touch point and the original stop point.
Reason 2: There is a foreign body (non-active touch) pressed five-wire resistive touch screen within the effective work area.
Solution 2: Remove the foreign body of the effective working area of ​​the pressed five-wire resistive touch screen.
⑵ failure two: touch no response
Phenomenon: When the screen touches the mouse arrow without any action, no position changes have occurred.
Reason: the cause of this phenomenon for many reasons, the following one by one description:
① touch screen failure;
② touch screen control card failure;