Clk clock signal: the shift pulse provided to the shift register, each pulse will cause the data to move into or out of one bit. the data on the data port must be coordinated with the clock signal to transmit data normally, and the frequency of the data signal must be 1 / 2 times that of the clock signal. In any case, when the bell signal No.1 is abnormal, it will make the whole board show disorganized.
Stb latch signal: the data in the shift register is sent to the latch, and its data content is illuminated and displayed by the led through the drive circuit. However, because the drive circuit is controlled by en enable signal, the premise of its lighting must be that it is enabled to be j " on state". The latch signal must also be coordinated with the clock signal and Diao' can display a complete image. In any case, when the latch signal is abnormal, it will make the que board display disorganized.
En enable signal: the whole screen brightness control signal is also used for screen blanking. As long as its duty ratio is adjusted, the change of brightness can be controlled. When the enable signal is abnormal, the whole screen will be dull, dark or trailing.
Data signal: provides data needed for displaying images. You must coordinate with the clock signal to transfer data to any display point. Generally, red, green and blue data signals are separated in the display screen. if a data signal is shorted to the positive or negative electrode, the corresponding color will appear full bright or not bright, and the corresponding color display situation will be uncertain when the data signal is empty.
Abcd line signal: only when dynamic scanning is sensitive to the presence of Diao, ABCD is actually a binary number, and a is the lowest bit. if ABCD signal is used to represent 16 lines ( 1111 ) in the control site, only ab signal can be used in 1 / 4 scanning, because the representation range of ab signal is 4 lines ( 11 ). When the line control signal is abnormal, there will be display dislocation, highlight or image overlap and other phenomena.
Common troubleshooting means c " tools: multimeter, soldering iron, blade, screwdriver, tweezers, etc". )