T-CON board is also called logic board or control board. T-CON is the English abbreviation of Timming Controller, which means timing control circuit. At present, there are not many T-CON boards in China, CRT TV has a history of several decades. The traditional CRT TV works by scanning, and the signals are serial. The current TV standard is based on CRT TV, so the TV signal passes through the TV main board. The output after decoding is also a serial signal. We know that the liquid crystal display works in a matrix display mode, and it processes parallel signals. That is to say, if the TV signal decoded by the motherboard is sent directly to the LCD display, the LCD display is Can't be displayed. There must be a device that converts serial signals into parallel signals so that the LCD can display TV signals, so there is a T-CON board, which is a device that converts serial signals into parallel signals. The TV signal output by the main board is disassembled and recombined in the T-CON board to finally form the control signal and data signal required for the row and column drive of the liquid crystal display. The general T-CON board circuit can be roughly divided into three parts: signal processing circuit (main IC and its peripheral circuits), gray-scale forming circuit (GMA forming circuit), and power supply circuit (DC/DC circuit). The signal processing circuit mainly converts the TV signal transmitted from the motherboard into the control signal, pixel signal, auxiliary signal, etc. required for the LCD display; the gray-scale forming circuit mainly forms the gray-scale signal required for the LCD display (the grayscale can make The display of the LCD screen is more layered, making the display richer and more vivid). The power supply circuit mainly forms the signal processing IC, the power supply voltage of the row drive and the column drive, and the switching voltage of the TFT (TFT turn-on voltage VGH, TFT turn-off voltage VGL) and so on, source posted in the world of electronics