1. The motherboard inverter is unresponsive after power-on, indicating partial damage. 2. The inverter and triode D667 are burned out due to a power-on insurance failure. 3. A blue screen appears after powering on, and the CPU or motherboard may be faulty. The LCD negative pressure is too low, with a voltage of 0, which suggests a motherboard issue. 4. The screen is black, and there is a contrast problem. 5. Communication issues occur due to poor connection of the communication cable. 6. The touch panel sometimes fails, causing a white screen. 7. The screen is black, and the inverter is damaged. The power supply is also at risk of burning out, leading to backlight failure. 8. The motherboard is faulty, and the inverter is damaged. 9. The motherboard program does not respond, requiring a replacement. 10. Poor touch sensitivity and abnormal touch resistance suggest a faulty touch panel. Silver paste wire resistance being infinite indicates a need for replacement. 11. The power supply is burned, and the power triode has high current breakdown, necessitating motherboard replacement. 12. Severe corrosion of the motherboard's liquid crystal components leads to no display, caused by improper environmental conditions from the customer. 13. The PWR light does not illuminate, even though all connections are properly made. 14. The dual serial port cannot communicate due to software issues. 15. The motherboard is loose, and the touch panel is fixed using strong glue. 16. The 485 serial communication is poor, and even after replacing the IC, it still doesn’t work, indicating a motherboard fault. 17. The touch screen becomes unresponsive due to an inverter failure. Some parts of the device are burned. 18. TP1 and TP2 short circuits cause the CPU to burn out. 19. Poor contact from misaligned communication port pins causes communication issues. Software misuse can also contribute. 20. The screen surface is cracked, resulting in poor touch performance. 21. Touchscreen crashes are often caused by customer misuse of software. 22. Surface acoustic wave touchscreen issues include: - **Fault 1: Touch deviation** – The finger position does not match the cursor. - *Cause:* Incorrect calibration during driver installation. - *Solution:* Recalibrate the touch screen. - **Fault 2: No response on touch** – The cursor does not move when touched. - *Causes:* Dust on the sound reflection stripes, faulty touch screen, control card, signal line, serial port, OS, or incorrect driver installation. - *Solutions:* Check the signal indicator, clean the screen, verify serial port settings, run COMDUMP and SAWDUMP commands, and check system errors during calibration. If issues persist, consult a professional.
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