Maintenance of LED electronic display
Author:Li Dan Time:2021-09-14 14:39 Browse(997)
Different boards have different driving modes and different wiring. Find some PCB circuit diagrams on the Internet, download them and have a close look. They are similar.
Different unit boards have different driving methods and different wiring.

Maintenance of LED electronic display

find some PCB circuit diagrams on the Internet.
download them and have a closer look, they are similar.
basic fault diagnosis and troubleshooting of LED electronic display screen
1. Phenomenon: all LED flashes
problems: poor contact problem: the voltage labels of switching power supply and LED are inconsistent
solution: ensure the voltage labels of switching power supply and LED are consistent problems: 1. Whether the connection direction is correct 3. The power cord is connected reversely
solutions: 1. Remove.
plug in the right direction again
2. Make sure that the red wire is connected to the positive pole and the black wire is connected to the negative pole
3. Find out some of the lines that are reversely inserted and re connect them<4. Phenomenon: all LEDs are not on 2. Whether the positive and negative wiring of power supply are correct 1. The whole screen is not bright or a square appears
"whether the control host is on
" whether the communication line is plugged in
"whether the sending card is plugged in
" whether the multimedia card and the acquisition card are connected, Whether the data lines between the sending cards are well connected
"the switch position of JP1 or JP2 of the receiving card is not correct" turn on the host
"plug in the communication line well
" re plug the sending card
"connect the multimedia card and the acquisition card well,Whether the computer display is protected, or whether the display field is black or pure blue.
(simultaneous screen)
2 Every time you start the LED studio, you will be prompted that the signal acquisition line between the COM port of the control system and the data sending card is not found, or the COM port of the computer itself is broken.
connect the data line or replace the computer
3 The whole screen is shaking or ghosting "check the communication line between the computer and the large screen
" check the DVI line between the multimedia card and the sending card.

"the sending card is broken.
" re insert or replace the communication line, punch and reinforce the DVI line, and replace the sending card The driving part
1 unit board does not light up
several consecutive boards do not light up in the transverse direction.
check whether the connection between the normal unit board and the abnormal unit board is connected<
or if the chip 245 is normal.

several consecutive boards are not bright in the longitudinal direction.
check whether the power supply of this column is normal.

+ 5V power or GND is supplied.
+ 5V is short circuited to GND.
one line of the unit board or the line of the corresponding module is not bright or normal, and display "
to see whether the pin of the line signal of the corresponding module has false soldering or missing soldering<
check whether the upper and lower resistances of the line signal are not soldered or missed.
3. Two lines of a unit board are on at the same time (when the text is displayed, one line is normal and the other line is on)
check whether the two lines of signals corresponding to the module are short circuited.

4. The red or green color of the upper or lower part is not on or abnormal.
2The unit board is lack of color "
check whether the 245 R.G B data has output.

check whether the normal 595 output pin is connected with the abnormal 595 input pin
check whether the input pin is normal or short circuited to GND, + 5V.
check whether the input pin is normal or short circuited to GND, + 5V
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