SMD aluminum electrolytic capacitor

MOS power IC full range

Photocoupler

1. Surface acoustic wave touch screen
(1) Fault 1: Touch deviation phenomenon 1: The position touched by the finger does not coincide with the mouse arrow.
Cause 1: After the driver is installed, there is no vertical touch to the center of the bull's-eye when the correction position is made.
Solution 1: Recalibrate the position.
Phenomenon 2: Some areas are touched accurately, and some areas are touched.
Reason 2: A large amount of dust or scale accumulates on the sound reflection fringes on the periphery of the surface acoustic wave touch screen, which affects the transmission and transmission of the acoustic signal.
Solution 2: Clean the touch screen, pay special attention to clean the sound reflection stripes on the four sides of the touch screen. When cleaning, disconnect the power of the touch screen control card.
(2) Fault 2: Touch no response: When the screen is touched, the mouse arrow has no movement and no position change has occurred.
Reason: There are many reasons for this phenomenon, one by one:
1 The dust or scale accumulated on the sound wave reflection stripe on the periphery of the surface acoustic wave touch screen is very serious, resulting in the touch screen not working;
2 The touch screen has failed;
3 The touch screen control card has failed;
4 The touch screen signal line has failed;
5 The serial port of the computer host has failed;
6 The operating system of the computer has failed;
7 The touch screen driver is installed incorrectly.
solve:
1 Observe the touch screen signal indicator. The lamp flashes regularly under normal conditions. It flashes once every second. When the screen is touched, the signal light is always on. After the touch is stopped, the signal light flashes.
2 If the signal light is still in the steady state when there is no touch, first check whether the touch screen needs cleaning; secondly, check whether the serial port number connected to the hardware matches the serial port number set by the software, and whether the serial port of the computer host is working normally.
3 Run the COMDUMP command in the driver disk. This command is a DOS command. Add a space and serial port code 1 or 2 after COMDUMP and touch the screen to see if data is rolled out. If the data is rolled out, the hardware connection is normal. Please check if the software settings are correct and conflict with other hardware devices. If there is no data to roll out, the hardware will fail, and the specific fault point is to be determined.
4 Run the SAWDUMP command in the driver disk. This command is a command under DOS. When running the program, the program will ask for the type of control card, the port number of the connection, and the transmission rate. Then the program will read the relevant data from the control card. Please pay attention to the AGC of the X-axis in the lower left corner of the screen and the #p#page title #e#AGC value of the Y-axis. If the value of any axis is 255, the transducer of the axis will be faulty and need to be repaired.
5 When performing the first calibration after installing the driver, pay attention to the details of the system error. “The control card is not found”, “The touch screen is not connected”, etc., check the corresponding parts according to the prompts. For example, whether the touch screen signal line is firmly connected to the control card, and whether the keyboard takes all the wires to connect with the host. 6 If you still can't get rid of it, ask a professional to repair it.
Fault summary
1. Power-on unresponsive motherboard inverter is partially damaged
2. On-burning insurance inverter burnout triode D667 breakdown
3. Power on the blue screen, after 10 minutes of power on, the screen turns blue. The motherboard CPU is bad. The motherboard LCD negative voltage is too low, the LCD negative voltage is 0, the motherboard is faulty.
5. Screen black contrast problem
6. There is sometimes no communication cable contact during communication, resulting in poor communication.
7. Touch failure, sometimes white screen touch panel failure
8. Black screen, dead screen inverter burned out and burned, motherboard failure LCD failure, motherboard also burned motherboard power supply partially damaged motherboard failure, high current burned backlight is not bright motherboard inverter fault inverter Protected by power-on black screen #p#分页头#e#
LCD failure, touch panel damage
10. The touch is normal, the motherboard program does not respond to the motherboard failure, replace the motherboard
11. Bad touch, touch failure; insufficient operational sensitivity; touch resistance abnormal silver paste line resistance infinite replacement touch panel client problem
12. The power supply burns out. The power transistor is broken down by a large current to replace the main board.
13. The liquid crystal components of the motherboard are severely corroded, and there is no display of damage to the text components caused by poor customer environment.
14. The PWR light does not illuminate, and everything else is properly reconnected to the PWR light signal line.
15. Dual serial port can not communicate due to wrong software
16. The motherboard is loose. The touch panel is fixed. The foot is broken and glued with super glue.
17. 485 serial port communication is bad. After replacing the IC, communication still cannot be performed. The motherboard is faulty.
18. Touch screen power-on unresponsive motherboard inverter partially burned out
19. TP1, TP2 short circuit to ground, CPU burning
20. Poor communication port pin skew, poor contact, unable to communicate, adjust pin position, misuse of software

22. The screen cannot be switched. The surface of the panel is cracked and the touch is poor.
23. Touch the crash,
Customer misuse of software