LED displays are more and more widely used, but people's knowledge of LED displays is not very high. The fault of the unit plate is one of the common faults of LED display. What should we do when the display panel has a problem?
1. The whole panel of LED display panel is not bright: check whether the power supply and signal line are connected; Check test card is able to identify the interface, test card red light does not recognize, check if lamp panel power supply with test card or lamp panel interface signals and to short-circuit the unable to identify the interface; Check whether the 74HC245 is not fable short circuit, and the corresponding enabling (EN) signal input (EN) signal input is not virtual or short circuit to other lines.
2. During the point-oblique scan, the regular lines of the regular lines are not bright and the picture is stacked: check whether the input port of A, B, C and D is broken or virtual or short circuited. Check whether the output terminals of A, B, C and D of 245 are short-circuited or virtual or disconnecting. Check whether the signals between A, B, C and D are short or short.
3. There is a line or a few lines in the light: check whether the line between 138 and 4953 is broken or false, short circuit.
4. When the inside scan is scanned, the two lines or lines (usually multiples of 2, with regularity) will be lit together: check whether the signals of A, B, C and D are short circuited; Check whether the 4953 output is short-circuited with other output terminals.
5. If there is a single point or more (irregular) in the light, it is not clear whether the control foot measurement corresponding to the module is short circuit with the line; Replace the module or single lamp.
Summary: understand and master the common faults and solutions of the full-color LED display panels, which can help improve the safe use efficiency of LED display.