How to repair the high voltage plate of the desktop computer LCD monitor is broken

After the high-voltage board is damaged, the backlight of the LCD loses power and does not light up, causing the display to go black.

If there is a circuit foundation, it can be repaired by replacing the damaged components. If not, you can send it to a professional repair point for repair. Avoid electric shock accidents or the expansion of the fault surface.

If the high-voltage bar fails, it will directly cause the display to go black.

The notebook display high voltage strip is the most important part of the notebook backlight assembly, and it is also the failure rate.

The main role of a relatively tall component is to provide a suitable operating voltage for the backlight of a notebook display.

The fragile devices on the maintenance of the high-voltage board are the following: oscillation circuits and switches.

Transformer. It should be noted that during the maintenance process, many screen dimming phenomena are not caused by the high-voltage board itself, but due to damage to the connection with the motherboard, resulting in a dark screen.

The high-voltage board of an LCD TV is one of the most important components of a TV, which is responsible for converting electrical energy into a high-frequency impulse voltage for the LCD screen. If the high-voltage board fails, it will cause the LCD TV to not work properly, so it needs to be repaired in time. Here are the steps to repair the high voltage board of an LCD TV::

Check the connection line: First, check whether the connection between the high-voltage board and the other circuit boards is secure. In case of loosening or poor contact, the interface cable needs to be re-tightened or replaced.

Capacitor replacement: The high-voltage board is mainly composed of electronic components such as capacitors, transformers, and diodes. If the capacitor is aged, leakaged, or damaged on the high-voltage board, the capacitor with the same parameters needs to be replaced.

Replace the diode: If there is a short circuit or damage to the diode, etc., the diode with the corresponding parameters needs to be replaced.

Replace the transformer: If the transformer is damaged or the coil is open, the transformer with the same parameters needs to be replaced.

Check the driver chip: The driver chip in the high-voltage board is also a component that is prone to failure, and if it is damaged, it needs to be replaced with the same type of driver talk chip.

Before performing repairs, make sure that you are safe and have the appropriate knowledge and professional tools for electronic repairs. If you're not sure how to fix it, it's recommended that you look for a professional TV repairer to check and repair it.

You can use a good external lamp to access, if the lamp is on, it is not that the high-voltage plate is broken, if it is not bright, it is that the high-voltage plate is broken.

If you can't be sure that you can use a good high-voltage plate to light up the display, if the display screen is bright, the original high-voltage plate is broken, and if it is not lit, the display screen is broken.

Summary. Hello, friend, I am very happy for you Oh to judge the quality of the high-voltage plate of course with a high-voltage test rod multi-meter measurement, the simple way is to use an ordinary electric pen close to the lamp line, neon lamp should sense the voltage and light up. Unless the lamp is physically damaged, it generally does not suddenly fail to light up, and most of the lamps slowly decrease (redden) and finally break.

How to tell if the LCD high-voltage plate is broken or the lamp is broken.

Hello, friend, I am very happy for you Oh to judge the quality of the high-voltage plate of course with a high-voltage test rod multi-meter measurement, the simple way is to use an ordinary electric pen close to the lamp line, neon lamp should sense the voltage and light up. Unless the lamp is physically damaged, it generally does not suddenly fail to light up, and most of the lamps slowly decrease (redden) and finally break.

Or you can use a good external lamp to connect first, if the lamp is on, it is not that the high-voltage board is broken, if it is not bright, it is that the high-voltage plate is broken.

Summary. Of course, it is possible to repair high voltage plates, as long as you have some basic electronic knowledge and skills. First of all, you can try to find the cause of the failure of the high-voltage board.

Check for any burned-out parts or loose connections. If so, try replacing the parts or reconnecting them. Alternatively, you can use a test instrument to check whether the voltage and other parameters on the board are normal.

If you are not sure how to repair a high-voltage board, you can consult a professional electronic engineer or seek professional repair service. In short, as long as you have some technical knowledge and repair experience, it is possible to repair the high-pressure plate yourself.

Of course, it is possible to repair high voltage plates, as long as you have some basic electronic knowledge and skills. First of all, you can try to find the cause of the failure of the high-voltage board. Check for any burned-out parts or loose connections.

If so, try replacing the parts or reconnecting them to the side. Alternatively, you can use a test instrument to check whether the voltage and other parameters on the board are normal. If you are not sure how to repair a high-voltage board, you can consult a professional electronic engineer or seek professional repair service.

In short, as long as you have some technical knowledge and repair experience, it is possible to repair the high-voltage plate by yourself.

Can you add, I don't quite understand it.

It is possible to repair high-voltage plates, as long as there is electronic knowledge and skills. Try to find the cause of the failure and replace or reconnect the burned out parts of the crack. Board parameters can be inspected using test instruments.

If necessary, consulting a professional electronic engineer or repair service is also an option. In short, with technical knowledge and repair experience, it is feasible to repair the high-voltage plate by yourself.

The phenomenon of broken high-voltage plate is that the screen is not bright, you can see that there is an image if you look carefully, if you can find the faulty component, then replace the faulty component, if you can't find the faulty component, then replace the whole high-voltage board. Under normal circumstances, the step-up transformer and the power amplifier tube behind the transformer are easy to break, and the safety of the front end of the transformer will also be burned. If you are satisfied, please adopt, if you don't understand, please ask.

It is recommended to change the board, and replace that one if it is broken, ** is sold.

Backlight and High Voltage Board Fault Class:

Because the backlight and the high-voltage board are directly connected, the faults of the two have similar behavior, so they are classified as one category.

1. There is ** display, the screen is dim, red and purple, but the brightness can be adjusted and does not flicker. Such a situation is usually the aging of the backlight tube, such a situation usually does not happen suddenly, but is an increasing situation, the only way to solve the problem is to replace the lamp, 2, there is a ** display but the screen flickering, no red and purple. The screen squeaks. In this case, the lamp is usually good, because of the poor contact of a high-voltage component on the high-voltage board after long-term work, usually the chip inductance, 3. The screen is not lit at all, but it can be vaguely seen that there is a ** display. In this case, if you can hear the squeak, you can judge that the lamp power supply is open or the lamp is damaged, you can check the power slot of the lamp, if it is not open, you can only replace the lamp. If you can't hear the squeak, it may be the break or damage of the parts on the high-voltage board, generally you have to open the screen and measure with a meter to know exactly, usually replacing the high-voltage plate can solve the problem.

Power supply cable and signal cable faults: this kind of fault is the easiest to distinguish and the most easy to confuse, easy to distinguish is that if it is due to the poor contact of the wire, as long as the screen cable is shaken and the screen opening and closing angle can be changed, but if the screen is completely broken, it is easy to be confused with the LCD board failure, high-voltage board, lamp and other faults, at this time, only with the help of meter measurement and other methods to use the strategy of gradual elimination to judge the location of the fault, generally determine the location of the fault after replacing the screen cable can be solved. There are some typical fault phenomena of the screen line, which can be immediately determined to be the problem of the screen line.

According to the above instructions, it may be a problem with the lamp.