It is understood that the current technology is more and more developed, network monitoring is an indispensable project, the application of the monitor is also very extensive, this article summarizes some solutions around the common faults of the monitor application, you may wish to take a look.
First, the color of the boot image is not normal - the picture tube is magnetized, the picture tube is magnetized: the boot image and sound are normal, but there are colored spots in the upper left corner, lower left corner, upper right corner, and lower right corner of the picture tube, or there is irregularity in the middle of the image. Colorful spots.
Solution:
1. Press the power switch button on the front panel of the monitor to turn off the camera. After about 10-20 minutes, turn it on again to confirm whether the color spots will disappear automatically (multiple switches are required).
2. Check if there are speakers, subwoofers, etc. that can generate magnetic field interference near the monitor. If there is any place to adjust the position of the monitor or remove the interference source.
3. Degaussing the monitor with a degaussing device (Degaussing method: After the degaussing device is energized, press and hold the degaussing button to move the degaussing device around the monitor screen. After degaussing, the degaussing device is removed from the middle of the monitor screen. Degaussing completed)
4. After the above 1, 2, and 3 items are processed, the magnetization problem cannot be solved. It can be judged that there is a problem in the magnetron or the automatic degaussing circuit of the picture tube. The machine can replace the main board for the problem of the automatic degaussing circuit, and the magnetized machine of the picture tube can be replaced. Picture tube (return to factory).
Second, the boot image has no color 1. The color system of the adjusted image is “automatic†(whether the camera color system is set in black and white)
2. Press the “MENU†button on the monitor panel to increase the “Chroma†value in the image menu. 3. Adjust the “Contrast†item in the monitor software menu. 3. The boot image has horizontal lines or twill interference. 1. Detection and distribution. Whether the contact between the device and the signal cable of the host is poor, and whether the monitor and the motherboard's graphics card are in good contact with each other. You can reconnect or shake the interface to detect whether the horizontal line or twill interference will disappear during the shaking process.
2. Exclude external environmental interference (motor vehicles, power tools, etc.), try to avoid the above interference sources and monitors on the same power outlet.
3. Disconnect the connection between the distributor signal source and the host, and exit the monitoring screen to check whether the interference exists. If the problem still exists, it can be judged that there is interference failure on the monitor board and the motherboard needs to be replaced.
4. The boot image is dark or black. 1. Increase the “Brightness and Contrast†value in the image menu. 2. Open the monitor back cover and adjust the “screen†knob on the high voltage package until the brightness is right. White back cannot be displayed. Sweep the line (Note: Open the back cover of the monitor and power it on. The monitor board must be placed on an insulated table, and the hand should not touch the high voltage cap.)
3. After the above 1 and 2 items are processed, the problem cannot be solved and the motherboard can be replaced.
4. After the above 1, 2, and 3 items are processed, the problem cannot be solved, and it can be judged that the picture tube has aged.
5. There is no image, no characters, and the indicator light is on the boot screen. 1. Press the up or down button on the monitor panel first. If it can be turned on, it is in the normal standby state.
2. After the first step is detected, it still cannot be turned on. You need to replace the monitor board. (There is a problem with the standby circuit)
Sixth, automatic boot 1, the monitor power switch is in the normal open state, it is normal to turn on the power directly.
2, the monitor power switch has been turned on, has lost control, (judgment: can open or close the monitor power switch, check whether the panel power indicator is on when the switch is turned on, whether it is off when the power switch is off, there are more than Phenomenon can judge the switch is normal)
7. The power-on indicator does not light. 1. Use an electric pen to check if the socket has power and the socket indicator is on.
2. Replace other sockets or change sockets of the same socket. 3. Is the monitor power cord disconnected?
4. Check if the connectors on the monitor board are connected properly.
5. After the above 1, 2, and 3 items are detected, the problem cannot be solved and the motherboard needs to be replaced.
Eight, remote control failure 1, check the remote control battery installation is correct.
2. Replace the new battery.
3. Test with the same model remote control to determine whether the remote control is faulty or the monitor receiver is faulty. If another remote controller of the same model can be used on the monitor, it can be judged that the monitor receiving head is faulty and the motherboard needs to be replaced.
Nine, the bottom or top of the boot image is severely compressed. 1. The monitor board needs to be replaced when this problem occurs. (The reason is caused by abnormal operation of the field circuit)
10. After the machine is turned on, the surface of the parts on the main board is burnt, black, and hot.
1: The monitor board needs to be replaced due to this problem (due to a severe short circuit in the circuit).
11. The machine casing has a slight leakage phenomenon. 1: This is a kind of induction electricity, which is a normal phenomenon.
2: The external grounding wire can be eliminated, and the inductive power can be eliminated if the external grounding wire is in good contact.
3: The ground wire inside the machine should be in good contact.
12. After the shutdown, there is a bright spot on the screen. 1: The bright spot appears after the shutdown is the high pressure release process of the picture tube. The bright spot will disappear within about 5 seconds, which is normal.
13. A vertical line is displayed on the monitor screen after power on. 1. The monitor board needs to be replaced when the problem occurs. (The reason is that the circuit has an open circuit)
14. After the monitor has been used for a period of time, it will automatically black out.
1: The motherboard needs to be replaced if there is a problem (there is a thermal breakdown or solder joint on the main board)
Fifteen, the entire screen is blurred and the menu characters are blurred.
1. Adjust the “FORCE†knob of the high pressure package to adjust the characters clearly. 2. Use the hair dryer to dry the emergency. After drying, the picture can be restored.
3. After replacing the monitor board, keep the environment ventilated. (The reason is that the tube seat is affected by moisture)
Sixteen, start burning fuse 1, replace with 3. 15A fuse, power can start normally.
2. After the fuse is replaced, the power is turned on. If the fuse continues to be burned, the circuit is short-circuited and the motherboard can be replaced.
(Note: If you see the black or burst inside the burned fuse, please replace the motherboard directly)
Seventeen, the boot display shows a horizontal bright line 1: The monitor board needs to be replaced when this problem occurs. (The reason is that the field circuit is not working or the work is not working properly)
18. After the monitor is turned on, the image is “seriously†distorted. 1: The monitor board needs to be replaced when this problem occurs. (The reason is that the circuit or power supply is not working properly)
Nineteen, the boot screen full screen shows no irregular white horizontal line 1: The monitor board needs to be replaced when this problem occurs. (The reason is 22UF/250V capacitor failure or replacement of 22UF/250V capacitor)
Twenty, after the boot, I heard continuous buzz
1: The monitor board needs to be replaced if the problem occurs (there is a short circuit in the line or row circuit, or a short circuit in the video amplifier integrated circuit of the board)
Twenty-one, severe color cast after booting (red, blue or other primary colors)
1: The monitor board needs to be replaced if the problem occurs (because the component on the video board is faulty or the bus RGB value is set incorrectly)
Twenty-two, a horizontal black line appears after booting, moving from top to bottom.
1: The monitor board needs to be replaced if the problem occurs (because 100UF/400V fails or replaces 100UF/400V capacitor)
Twenty-three, the front panel keys are invalid after power on 1: First confirm whether all the keys are invalid or a certain key is invalid. If a certain key is invalid, replace the bad key.
2: If all the keys are invalid, you need to replace the motherboard (because the CPU key control circuit is invalid)
Twenty-four, the front panel indicator flashes once after power on.
1: The monitor board needs to be replaced if this problem occurs. (The reason is that the protection circuit has been working, and the motherboard has protection status of overcurrent or overvoltage)
Twenty-five, after the boot, the image is stretched to the right or compressed horizontally to the left. 1: The problem occurs when the monitor board needs to be replaced (the cause is a problem with the line circuit)
Twenty-six, after the boot, the machine emits a strange noise in the machine. 1: The problem needs to be replaced by the monitor main board (the reason is caused by the ignition of the high-pressure bag or the high-pressure cap. If the high-pressure cap is fired, the high-pressure cap can be coated with high temperature. Insulating glue can be)
Twenty-seven, after the MC14HC is turned on, the digital camera is displayed, no image is displayed, and the image is displayed normally after replacing the C105/10UF/25V capacitor.
Twenty-eight, MC21H display digital machine after booting, no image display, after replacing the DZ104 regulator tube, there is an image display.
Twenty-nine, after the MC21Hp is turned on, there is an image display, and the screen has irregular color spots. After checking, the degaussing coil is missed. After the degaussing coil is connected, the power is turned on again, and the machine displays normal.
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