LCD TV LED booster board principle and maintenance are as follows:
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First, LCD TV LED booster board principle:
The LCD TV LED booster board is mainly responsible for converting the input low-voltage direct current into high-voltage direct current for the LCD TV backlight LED lamp strip. The specific principles are as follows:
1. Input power: Receive low-voltage DC power from the power module.
2. Boost circuit: Use DC-DC boost converter to convert low voltage direct current into high voltage direct current. The booster circuit generally uses a high-frequency converter to increase the voltage and reduce the current at the same time to improve energy efficiency.
3. Output end: Supply the high voltage direct current after voltage boost to the LCD TV backlight LED lamp belt.
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Two, LCD TV LED booster plate maintenance:
1. Check the connection: First, check whether the power cable and the booster board are properly connected to ensure that they are not loose or disconnected.
2. Check the circuit diagram: View the circuit diagram of the booster plate to understand the position and working principle of the circuit components.
3. Check the components: Before using the multipurpose meter for detection, check whether there are traces of burning, damage or leakage on the circuit board. If so, the corresponding component needs to be replaced or repaired.
4. Test components: Use a multi-purpose meter to test whether capacitors, resistors and diodes are normal. When a faulty component is found, the damaged component needs to be replaced.
5. Check the boost circuit: check whether the voltage converter works normally. An oscilloscope can be used to measure the output waveform, or a voltmeter can be used to measure whether the output voltage meets specifications.
6. Check the backlight belt: If the booster plate works normally but the LCD TV still does not show the picture, the backlight belt may be damaged. At this time, it is necessary to check whether the backlight belt is working properly, and if necessary, replace the backlight belt.
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It should be noted that the maintenance of LCD TV LED booster board requires a certain amount of electronic maintenance knowledge and skills, and the operation of the circuit board should be careful. If there is no relevant experience, it is best to ask professional maintenance personnel to handle.
The principle of the LCD TV LED booster board is mainly to generate a rectangular pulse signal through the pulse width modulation IC, which changes with the modulation of the brightness to adjust the power supply size of 12V to the self-excited oscillator, so as to produce a high voltage that is different with the power supply, for the lamp to emit light. During maintenance, you first need to check whether the four basic conditions of the booster board are met, including the 12V power supply line, the ground line, the control signal line and the brightness control line. Then, the booster plate can be short-circuited to test whether it can light up, and further circuit testing can be performed.
Because the principle and maintenance process is more complex, it is recommended to ask professionals to operate. At the same time, it is also recommended that in daily use, pay attention to maintenance and cleaning to avoid circuit failures caused by dust and dirt.
The LCD TV LED booster board is a circuit board used to convert the input low voltage into high voltage to drive the LED backlight strip. If the LED backlight is not bright or insufficient brightness, it may be a booster plate fault and needs to be repaired.
During maintenance, you first need to check the normality of various components through testing instruments, including capacitors, resistors, diodes, transistors, etc. If a component is faulty, replace it. When replacing components, it is necessary to select the exact same model and parameters as the original, and connect in strict accordance with the circuit diagram to ensure the stable operation of the circuit.
The LCD TV LED booster board is mainly responsible for converting the input power into a high voltage to provide the required drive voltage for the LED circuit. In terms of maintenance, it is necessary to first check whether the input power supply and output voltage of the booster board are normal, and check whether there are problems with key components such as capacitors and resistors. If there is damage, it needs to be replaced. In addition, it is also necessary to pay attention to ensure the reliability of the connection between the booster plate and the motherboard, while avoiding the damage of the transitional temperature or current to the booster plate.