The LCD lifter driver board is often called A/D (analog/digital) board, which in a sense reflects the main functions of the driver board. The LCD screen lifter needs a digitized video signal to display images. The LCD screen lifter driver board is a functional module that completes the conversion from analog signal to digital signal (or from one digital signal to another digital signal), and at the same time Under the control of the image control unit, the LCD screen lifter is driven to display the image.


The LCD lifter drive board usually contains the main control chip, MCU microcontroller, ROM memory, power supply module, power interface, VGA video signal input interface, OSD key board interface, high voltage board interface, LVDS/TTL drive screen signal interface, etc. part.


The principle of the LCD lifter drive board is that the video signal sent from the display card of the computer host is sent to the main control chip of the drive board through the VGA video signal input interface on the drive board. The main control chip is based on the relevant LCD in the MCU microcontroller. The data of the screen lifter controls the LCD screen lifter to present images. At the same time, the MCU microcontroller realizes the power control and functional operation of the whole machine. Therefore, the LCD lifter driver board is also known as the LCD motherboard.

If the LCD lifter driver board is damaged, it may cause failures such as failure to boot, black screen, white screen, blurred screen, ripple interference, and key failure, which account for a large proportion of LCD failures.

Large-scale integrated circuits and SMD devices are widely used in LCD lifter drive boards. The layout of circuit components is compact, which makes it difficult to find specific components or run lines. Under non-factory conditions, its repairability is relatively small. If the driver board fails due to damage to the power supply part and the VGA video input interface circuit part, as long as we have circuit knowledge, we can easily solve it. For those caused by the internal MCU microcontroller The data damage caused by the driver board cannot work normally. Under the premise of having the data file (driver), we can use the LCD programmer to program the MCU microcontroller to repair the malfunction caused by the firmware damage. In the early drive boards, it was necessary to disassemble the MCU microcontroller for operation, which was quite difficult. The current driver boards have generally begun to use MCU microcontrollers that support ISP (Online Programming), so that we can program the data inside the MCU microcontroller online through the ISP tool. For example, the EP1112 latest LCD programmer we use can accomplish this kind of work.

In the maintenance of LCD monitors, when the driver board fails, if the LCD monitor originally uses a general-purpose driver board, you can directly find the corresponding motherboard to replace it. Of course, you still need to write in the MCU and the LCD screen. The driver corresponding to the lifter; if the driver board is a brand-name motherboard, we generally use the common "universal driver board" on the market to replace it for maintenance.

"Universal driver board" is also called "universal driver board". At present, common "universal drive boards" on the market include Lehua, Dingke, Kaixuan, Yuekang and other brands, as shown in Figure 5. Although the components used in this "universal drive board" are inconsistent with the "original drive board", But just use the LCD programmer to write the driver corresponding to the LCD screen lifter to the "universal driver board" (the LCD screen lifter driver CD will be sent with the programmer when you purchase the programmer), and then simply change the wiring. It drives different LCD screen lifters, which has strong versatility, and the maintenance cost is not high, which is easy for users to accept.