- Q:
Failure Analysis of LED Display Screen-Elimination Method (Control Card)
- We judge whether the control card is good or not, you first look at whether the power supply is turned on and the indicator light of the control card is lit. If you don‘t look at whether there is 5V power supply and whether the display screen can display content, as long as the content can be displayed, the function of the control card to display content is good. Then you use the control card software to find the control card. If you can find it, it indicates that the sending content of the control card has a good function. If you cannot find it, you can see if the communication line is connected properly. If it is connected properly, there may be a problem with the card. As long as these two functions are good, the control card is good, otherwise the control card must be replaced....
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Fault Analysis of LED Display Screen-Elimination Method (Switching Power Supply)
- Judging whether the power supply is good or not, if the power supply is broken, it will directly cause several boards to be unlit or abnormal at the same time, because one power supply controls several boards at the same time, that is, if your display screen is not displaying or displaying abnormally on several boards in the same small area, you should consider whether the power supply is broken. zui‘s direct detection method is to measure whether the output voltage is between 4.9~5.5V with the DC voltage level of the multimeter. If so, replace the power supply....
- Q:
Failure Analysis of LED Display Screen-Elimination Method (Unit Board)
- Judging whether the unit board is good or not, the LED full-color display screen signal is the input signal transmitted from the output pin of one unit board to the other board. Therefore, if one board has problems, the whole row behind it will not be bright or abnormal. Therefore, when there are problems in the display screen row, we should replace the board whose row starts abnormally, or jump over the board with a long flat cable, and then see if the following board displays normally.
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LED Display Screen Fault Resolution Method 01
- Knowing where the fault is, users can solve it by themselves if they have certain maintenance knowledge, effectively saving time and maintenance cost. The following small compilation summarizes some common troubleshooting methods. Failure Analysis of Unit Board I. output problem 1. Check whether the line from the output interface to the signal output IC is connected or shorted. 2. Check whether the clock latch signal of the output port is normal. 3. Detect whether the cascaded output data port between the driving ICs after zui is connected with the data port of the output interface or is short-circuited. 4. Whether the output signals are short-circuited to each other or to ground. 5. Check whether the output cable is in good condition. Two, all bright when one or more lines are not bright Check whether the line between 138 and 4953 is open circuit, virtual welding or short circuit. Three, the whole board is not bright 1. Check whether the power supply is connected to the signal line. 2. Check whether the test card is used to identify the interface. If the red light of the test card...
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LED Display Screen Fault Resolution Method 02
- Seven, there is a single point or single highlight, or the whole line highlight, and is not controlled 1. Check whether the column is short-circuited with power supply ground. 2. Check whether the row is short-circuited with the positive pole of the power supply. 3. Replace its driver IC. Eight, display chaos, output is not normal 1. Check whether the STB signal latched by clock CLK is short-circuited. 2. Check whether the clock CLK of 245 has input and output. 3. Check whether the clock signal is short-circuited to other lines. Note: The clock and latch signals are mainly detected. Nine, display lack of color 1. Check 245 whether there is input or output at the data end of the color. 2. Detect whether the color data signal is short-circuited to other lines. 3. Detect whether there is open circuit or short circuit or virtual soldering in the cascade data ports between the driving IC of this color. Note: It is easier to find the problem by using voltage detection method. Check whether the voltage of the data port is different from the normal one to determine the fault area. ...
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