How to test the fluorescent lamp of LCD monitor?
1. How to test the quality of LCD lamp
Lcd LCD TV backlight lamp test is to test whether its power supply is normal, and then remove the backlight protection to judge whether it is good or bad
2. How to detect the quality of LCD lamp
Test with a 12V emergency lamp panel and connect the lamp tube at the high voltage. If the lamp is on, it means the lamp is normal. If it is not on, replace it
3. How to judge whether the LCD lamp tube is broken or the high-voltage board is broken
Turn on the display screen and turn it off. If you smell the smell of burning pus, it should be that the high pressure plate is burned. Generally, there will be no smell of burning pus when the lamp tube is burned. It should be noted that if the high-pressure plate is burned, it may be burned together with the lamp tube. If you change the high-pressure plate yourself, it is recommended to replace the lamp even if it is not burned out. The brightness of the new tube is much higher.
How to test the fluorescent lamp of LCD monitor?
In addition, one output of the high-voltage bar can also be used to point the screen lamp tubes separately. The one that is not bright is broken. If it is all bright, it is the high pressure plate that is broken. Unless the lamp tube is physically damaged, it will not suddenly turn off, mostly because the brightness gradually decreases (turns red) and finally breaks down.
4. How to check the quality of LCD lamp tube of LCD TV
1. Turn the knob on the multimeter to the diode (buzzer) position, and insert the red and black probe at the correct position of the multimeter. 2. Observe the energy-saving lamp tube, which has four legs and two legs. When measuring, if it has four legs, select the middle two legs. Contact the red and black probes on the two pins to be detected. If there is a beep and the red led light of the multimeter is on, the lamp is good, otherwise the lamp is broken. 3. If there are two pins in the measurement, remove the lamp cap, and you will find four wires. The subsequent measurement method is the same as the four-pin lamp tube.
How to test the fluorescent lamp of LCD monitor?
5. How to test the lamp with the LCD
Answer: The lcd lamp is a cold light lamp.
Lcd is a kind of lamp tube that can do digital calculation (color temperature, lumen) according to the site environment to meet the overall design needs of building decoration, that is, achieve the appropriate elegant light and dark contrast effect, and can make a variety of color changes with the special computer control system.
Cold-cathode lamp is one of the most efficient and energy-saving light sources at present; Its color is rich and pure, which can be used for indoor and outdoor lighting of star hotels, city signs, building outline lighting modeling; The exterior contour of bridges, buildings and other buildings, and the decoration lighting of squares and other outdoor occasions are the preferred light source for urban bright projects. It has high brightness, high lumen, high efficiency and energy saving, and better long-distance visual effect.
Cold cathode lamp tube is a kind of high-end cold cathode low pressure glow discharge light source, which is based on the production process of neon lamp and further improves the overall specifications related to the production of light source, such as counter electrode, powder tube, production process, sophistication and supporting power supply.
How to test the fluorescent lamp of LCD monitor?
6. How to test the LCD lamp of the display
Supply voltage of LCD lamp:
1. Depending on the specific model, the voltage must also be different. There is no way to be specific. The voltage of the LCD lamp is generally about 1000-3000 volts;
2. The starting voltage of the lamp is above 1000V, and the voltage will be maintained between 600-800 after stabilization. The voltage is AC of course;
3. The lamp tube itself is high-voltage and AC. The voltage amplitude is also different according to the size, which is generally in the range of several thousand volts. The DC voltage of the high-voltage circuit is generally 12v and 5v, and a few of them are 3.3v;
7. How to judge the quality of LCD lamp
When there is sound and no picture on the LCD TV, take a flashlight and look at the TV screen. If you can see the faint image on the screen and measure the voltage of the LCD backlight drive circuit to be normal, you can consider that the LCD backlight is damaged.
8. Check whether the lamp tube is good or not
1. Turn the knob on the multimeter to the diode (buzzer) position.
2. Insert the red and black probe in the correct position of the multimeter.
3. Observe the energy-saving lamp tube, which has four legs and two legs. When measuring, if it has four legs, select the middle two legs.
4. Contact the red and black probes on the two pins to be detected. If there is a beep and the red led light of the multimeter is on, the lamp is good, otherwise the lamp is broken.