CLK clock signal: a shift pulse supplied to a shift register, each pulse causing data to move in or out of a bit. the data on the data port must be coordinated with the clock signal in order to transfer data normally, and the frequency of the data signal must be 1 / 2 of the frequency of the clock signal. In any case, when the bell letter No. 1 is abnormal, will make the whole board display disorganized.
Stb latch signal: the data in the shift register is sent to the latch and its data content is displayed by illuminating the led through the drive circuit. However, since the drive circuit is controlled by the en enable signal, its lighting must be enabled to the j " on state. The latch signal must also be coordinated with the clock signal so that the complete picture can be displayed. In any case, when the latch signal is abnormal, will make que board display clutter.
En enable signal: full screen brightness control signal, also used for screen blanking. The change in brightness can be controlled by adjusting its duty cycle. When the enable signal appears abnormal, the whole screen will appear not bright, dark bright or trailing phenomenon.
Data signal: provides the data needed to display an image. Must be coordinated with the clock signal to transfer data to any display point. In general, red, green and blue data signals are separated in the display screen. if a data signal is short-circuited to the positive or negative electrode, the corresponding color will appear fully bright or not bright. when the data signal is empty, the corresponding color display is uncertain.
ABCD line signal: only when dynamic scan sensitive Diao' exists, ABCD is binary number, a is the lowest bit, if use binary ABCD signal control site fan Tian is 16 lines ( 1111 ), 1 / 4 scan as long as ab signal, because ab signal range is 4 lines ( 11 ). When the row control signal is abnormal, display misalignment, highlight, or image overlap will occur.
Common fault handling means c " with: multimeter, soldering iron, blade, screwdriver, tweezers ... etc. )