Weiluntong contact screen repair
The first step in troubleshooting a touchscreen system is to determine if the problem is related to the display, software, or hardware:
Don't confuse the visibility issue with the contact screen issue, the two are unrelated.
Software issues are identified by the underlying hardware utility test. If the hardware transmits the contact coordinates correctly, the problem is with the driver or application software.
Hardware issues can be caused by contact screens, controllers, cables, power supplies, or integrated contact screen components in the display.
If you want to test multiple units, the simple way to verify hardware bugs is to replace them. Spacing is an important consideration when planning a board, and in general, this spacing does not take into account the addition of fabrication tolerances (i.e., permissible registration errors combined with erosion), and in fact, traces between plated through-holes between layers with non-utility pads removed can be short-circuited during electrical testing, resulting in cell obsolescence
Repair common faults of Weiluntong contact screen
Contact error
Phenomenon: The contact in some areas is accurate, and there is an error in the contact in some areas.
Reason: A large amount of dust or scale is piled up on the sound wave reflection stripes around the four perimeters of the external sound wave contact screen, which affects the transmission and transmission of sound wave signals.
Treatment: Clean the contact screen, pay special attention to clean the sound wave reflection stripes on the four sides of the contact screen, and disconnect the power supply of the contact screen control card when cleaning.
There was no repercussion on contact
Phenomenon: When touching the screen, the mouse arrow does not move at all, and the position does not change.
Reason: The dust or scale accumulated on the sound wave reflection stripes around the four perimeters of the external sonic contact screen is very severe, resulting in the inability of the contact screen to operate;
Processing: Investigate the contact screen signal indicator, which flashes regularly under normal conditions, about once per second, when touching the screen, the signal light is normal, and the signal light resumes flashing after stopping contact
Cause: Defect with the contact screen;
Treatment: If the signal light is still on when there is no contact, first check whether the contact screen needs to be cleaned; Secondly, check whether the string slogans connected by the hardware are consistent with the string slogans set by the software, and whether the serial port of the computer host is working normally.
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