Shenzhen Enrich Electronics Co., Ltd

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Company News >> What are the more serious faults on the LCD screen? 23th,July,2018
                                                 There are several types of faults caused by the LCD screen: white screen, flower screen, black screen, screen dark, yellow, white spots, bright lines, bright bands, dark lines, dark bands, and outer film scratches.
    Relatively easy to repair these faults are screen, yellow, white spots, and outer membrane scratches. The screen is actually the aging of the lamp, and it can be replaced directly. Both yellowing and white spots are backlight problems, which can be solved by replacing the corresponding backlight or light guide. The outer film scratch is the damage of the polarizer covered by the surface of the liquid crystal glass, and it can be replaced by hand. Of course, there are many precautions when implementing these faults that can be solved by replacement. The lamp should be installed in place to avoid light leakage. To handle the backlight, pay attention to dustproof. Otherwise, the dust will be spotted after the screen is lit. The replacement of the polarizing film should avoid crushing the screen when the film is torn, and the dust is even more taboo. Once the dust enters during the filming, bubbles will be generated, and it is basically necessary to scrap the film again.
    White screens, flower screens, and black screens are basically caused by circuit failures. First, the break of the screen line should be excluded, and then whether 3.3V has been added to the screen, and then check whether the rear stage has high voltage and negative voltage output, and whether the main control chip has output. A considerable part of the screen is because the line driver does not work, and it is simple to fly a few lines to solve the problem. A small portion of the screen is damaged by the first drive module of the row or column.
    The most difficult and highest maintenance cost is the maintenance of the cable screen. Most of the causes of these faults are caused by the solder joints or damage of the corresponding drive modules. Everyone knows that some drive modules are connected between the glass and the PCB of the LCD panel. The module is connected to the PCB board and the glass with a very fine solder joint. This kind of soldering foot can't be distinguished by the naked eye, nor is it soldered by our brand or air gun. Under the high magnification magnifying glass, the soldering foot should be correspondingly pressed and then hot pressed with special equipment. Some of the auxiliary materials used in this process, such as ACF glue and ACF cleaning solution, are very expensive, and the cleanliness of the operating environment directly affects the success rate of repair. This operating machine factor and human experience factors account for almost 50% each. But the success rate of repairing in the hands of an experienced and skilled maintenance engineer is basically over 90%.

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