Touch screen POS cash register common faults and solutions:
1. No response after power-on
Part of the motherboard inverter is damaged
2. Power on the insurance
Inverter burnout
Transistor D667 breakdown
3. Power on the blue screen, the screen turns blue after 10 minutes of power on.
Motherboard CPU is bad
The motherboard LCD negative voltage is too low, the LCD negative voltage is 0, the motherboard is faulty.
5. The screen is black
Contrast problem
6. Sometimes there is no communication
Poor communication due to poor communication cable
7. Touch failure, sometimes white screen
Touch panel failure
8. Black screen, dead screen
Inverter burnout
Power on, burn, insurance, motherboard failure
The LCD is faulty and the motherboard is also burnt.
9. The motherboard power supply is partially damaged.
The main board is faulty and there is a large current burnout.
Backlight does not light motherboard inverter failure
The inverter is protected from power-on black screen
LCD failure, touch panel damage
10. The touch is normal and the motherboard program does not respond.
The motherboard is faulty and the motherboard is replaced.
11. Bad touch, touch failure; insufficient operational sensitivity
Abnormal touch resistance
Silver paste wire resistance infinity
Replace the touch panel
Client problem
12. Power supply burnout
Power transistor is broken down by high current
Replace the motherboard
13. The liquid crystal components of the motherboard are severely corroded and there is no display after power-on.
Bad text caused by poor customer environment
14. The PWR light is off and everything else is normal.
Reconnect the PWR light signal line OK
15. Dual serial port cannot communicate
Wrong software
16. The motherboard is loose
Touch panel fixed leg break
Bonded with super glue
17. 485 serial port communication is bad
After the IC is replaced, communication still cannot be performed, and the motherboard is faulty.
18. The touch screen does not respond to power on.
The motherboard inverter is partially burned
19. TP1, TP2 short circuit to ground
CPU burnout
20. Poor communication
The serial port pins are skewed and the contact is poor, resulting in communication failure.
Adjust the stitch position
Misuse of software
22. The screen cannot be switched
Cracks on the surface of the panel cause poor touch
23. Touch the crash
Customer misuse of software
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