Tag: Touch screen maintenance

Touch screen is a special human-machine dialogue device that has been widely used in daily life, production, and commercial occasions. Touch screens are mainly divided into several forms: resistive screens, capacitive screens, infrared screens, and ultrasonic screens. Because it has too close contact with people and a large part of it is a vitreous structure, the probability of touch screen damage is relatively high. The most common area of damage to touch screens is often the surface touch outer screen, commonly known as the “touchpad,” which can be used normally after replacement.
Rongji Electromechanical Maintenance has been using touch screens in the industrial, commercial, medical, and military fields for over 20 years. Currently, in these areas, resistance screens are mostly used due to reliability and safety considerations. The automotive industry uses both resistive and capacitive screens, and touch screens in this field, whether they are capacitive or resistive, can be repaired by us.

Step 1: Remove the back cover and remove the motherboard screws

Touch screen manufacturers, considering profit, often design touch panels and even LCD components as non-standard products, and do not disclose the drivers and circuits to the public. If standard touch panels and controllers are installed, they are often not compatible.

Step 2: Remove the outer shell and use a hair dryer to heat up the film

Longi Electromechanical Company has a team of engineers who have been researching the reverse engineering of various touch screens for a long time. They have explored a solution and replacement process for touch screen accessories from the bottom layer or touch panel technology. They can perfectly use the touch panel and other accessories produced by Longi Company to replace the original ones, and solve problems for customers while significantly reducing maintenance costs.

Step 3: Peel off the film and remove the touchpad

Most resistive screens and a small portion of capacitive screens can be purchased from touch pads produced by Longi Company. Following the replacement method we provide, they can be installed and used normally.

Step 4: Apply double-sided tape to the touch screen border and place a new touch pad on it

A small number of resistive screens and some capacitive screens, due to their special design, customers can send the entire touch screen to Rongji Company by mail. We use professional software analysis and judgment, and through hardware processing and software patching methods, we can achieve cracking and replacement.

Step 5: Install the motherboard LCD and flip it over to test if the touchpad is functioning properly

Similarly, for accessories such as LCD, high-voltage bars, and light tubes, similar methods can be used to achieve functional repair of touch screens without affecting their use.

Step 6: After successful testing, apply the film and replace the touchpad

During the use of touch screens, in addition to the mentioned accessory issues, there may also be circuit failures such as power boards or motherboards. For example, it is not displayed, or the display is abnormal. This situation belongs to a hardware malfunction of the circuit. The entire machine can be sent to the headquarters of Longi Company by mail, and we will use circuit maintenance methods for repair.

A special situation is when there is a problem with the touch screen software, such as the battery running out or data being lost. This situation is quite troublesome. If the customer has backed up data, we can help them re-enter it and it can be used normally. If the customer does not have backup data and cannot contact the equipment manufacturer to find the data, the only solution is to rewrite the appropriate touch screen program according to the process and equipment flow. As touch screens are secondary development applications, the programming difficulty is not too high. However, it will take time to pair with other devices in the system, such as PLCs.

Longi Electromechanical Company has repaired the following brands of touch screens:

Siemens touch screens, Proface touch screens, Mitsubishi touch screens, Fuji touch screens, Panasonic touch screens, OMRON touch screens, WEINVIEW touch screens, Koyo touch screens, Delta touch screens, Toyota JAT touch screens for air-jet looms, Staubli touch screens, Beijer touch screens, AB (Allen-Bradley) Rockwell touch screens, Hitech touch screens, Schneider touch screens, Toyo touch screens, DMC touch screens, MCGS (Kunlun Tongtai) touch screens, Touchwin touch screens, General touch screens, Red Lion touch screens, B&R (Beckhoff & Rautert) touch screens, LG touch screens, M21 touch screens, Fatek (Yonghong) touch screens, IDEC (Waizu) touch screens, Wecon touch screens, Pingtong touch screens, Fanuc touch screens, Lenze touch screens, Advantech touch screens, Hakko touch screens, Yushin touch screens, UNIOP touch screens, Shihlin (See) touch screens, Parker touch screens, Eura touch screens, and Hakko White Light touch screens, among others.

Please note that some of the brand names mentioned may be trademarks or registered trademarks of their respective companies. The listing here is for informational purposes only and does not imply any affiliation or endorsement by Longi Electromechanical Company or any of the mentioned brands.

Common Touch Screen Issues:

Display is visible but cannot be touched or clicked, or the touch response is poor. In most cases, this is due to a faulty touch panel. Sometimes recalibrating can solve the problem, but mostly the touch panel needs to be replaced.

The touch screen does not display anything, and even the indicator lights are not on. This situation usually indicates a problem with the power supply unit of the touch screen.

The touch screen functions but displays a black screen, while the indicator lights are normal. This is typically caused by a burned-out backlight tube inside the screen.

The touch screen displays a distorted image or abnormal colors. This is often a problem with the liquid crystal display (LCD) or could be caused by issues with the connecting cables.

The touch screen displays a communication error, and the response to touch is very slow. This issue is not with the touch screen itself but rather with the connection between the Programmable Logic Controller (PLC) or other devices and the touch screen. In many cases, the problem lies with the connecting cables or plugs.