What are the maintenance methods of LED electronic display
Author:Cai qiuqing Time:2021-09-13 14:36 Browse(814)
In fact, the principle of maintenance electronic screen is very simple, the unit board is powered on, and then the signal input can be displayed normally. Buy a universal meter to measure the voltage. If the unit board is abnormal, replace the unit board. If the power supply voltage is abnormal, replace the power supply.
In fact, the principle of repairing the electronic screen is very simple, the unit board is powered on, and then the signal input can be displayed normally.

What are the maintenance methods of LED electronic display

buy a universal meter to measure the voltage.
if the unit board is abnormal, replace the unit board, and if the power supply voltage is abnormal, replace the power supply.
a. the whole board is not on.
1. Check whether the power supply is connected to the signal line Check whether the test card uses the identification interface.
if the red light of the test card flashes, there is no identification. Check whether the lamp board has the same power supply and ground with the test card, or there is a signal short circuit between the lamp board interface and ground, which leads to the unrecognized interface (intelligent test card). 3. Check whether 74hc245 has a short circuit, Whether the corresponding enable (EN) signal input and output pins on 245 are faulty soldering or short circuited to other lines
note: mainly check the power supply and enable (EN) signal
B. when the dot oblique scanning, regular interlacing is not bright, and the display screen overlaps
1. Check whether there is broken line or faulty soldering or short circuit between a, B, C, D signal input port and 245. 2. Check the A, B, C, D signal input port corresponding to 245 D whether there is open circuit or false soldering or short circuit between the output terminal and 138. 3. Detect whether there is short circuit between signals a, B, C and D or whether a signal is short circuited to ground.
note: mainly detect ABCD line signal.

C. one line or several lines are not bright when all light is on.
1. Detect whether there is open circuit or false soldering or short circuit between 138 and 4953.

D. two or several lines (generally multiple of 2) are detected when line scanning, Check whether there is short circuit between signals a, B, C and D. check whether the output terminal of 4953 is short circuited with other output terminals.
E. single point or multiple points (irregular) do not light up when it is fully on.
1. Find the corresponding control pin of the module and measure whether it is short circuited with the line. 2. Replace the module or single lamp.
F. one or several columns do not light up when it is fully on.
1 Find the pin on the module that controls the column,Check whether it is connected with the output terminal of the driving IC (74HC595 / TB62726,,,,)
g. there is single point or single column highlight, or the whole row highlight, and it is not controlled
1. Check whether the column is short circuited to the power supply ground.
2. Check whether the row is short circuited to the positive pole of the power supply.
3. Replace the driving IC
h. the display is chaotic.
but the output signal to the next board is normal
1 Detect whether the STB latch output corresponding to 245 is connected with the latch end of driver IC or the signal is short circuited to other lines.

I. display confusion.
abnormal output 1. Detect whether the clock CLK latch STB signal is short circuited.
2. Detect whether the clock CLK of 245 has input and output.
3 Detect whether the clock signal is short circuited to other lines.
note: mainly detect the clock and latch signal
J. display color missing
1. Detect whether the data terminal of the color 245 has input and output.
2. Detect whether the data signal of the color is short circuited to other lines.
3. Detect whether the cascade data ports between the driving ICs of the color have open circuit or short circuit Virtual soldering.
note: the voltage detection method can be used to find the problem easily.
detect whether the voltage of the data port is different from the normal one, and determine the fault area
K. the output has problems
1. Detect whether the line from the output interface to the signal output IC is connected or short circuited.
2. Detect whether the clock latch signal of the output port is normal.
3 Check whether the cascade output data port between the last driver IC is connected to the data port of the output interface or short circuited.
4. Check whether the output signals are short circuited to each other or to the ground.
5. Check whether the output wiring is in good condition.
4Specific solutions to specific problems.
if you have any questions, please check http://www.starshine.icoc.cn/ The above documents are provided by customer service one of starlight LED display maintenance,
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