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How to repair LED screen wall screen
May 24, 2018

1. The whole module is off: The module is not connected to the power supply; the input cable is inserted in reverse; the input and output are reversed; the positive and negative poles of the power supply are reversed.

2, the module does not light transmission is normal: protection circuit damage solution can 74HC138 4 feet and 5 feet short circuit.

3, there is a line in every three lines does not light: 4953 damage (is one of the damage).

4, each line lit one line: A signal problem, please check 74HC245 and 74HC138 whether there is Weld; can use multimeter 74HC138 first foot voltage is equal to about 2.5V, if there is a replacement 74HC138; carefully measuring the needle with ICA signal path Happening.

5, two lines light two lines: B signal problem, please check 74HC245 and 74HC138 whether there is welding; you can use multimeter 74HC138 second foot voltage is equal to about 2.5V, if there is a replacement 74HC138; careful amount of gold with ICA signal Access situation.

6, the first half of the second half of the normal half of the board is bright or not bright: If it is the case of T08A interface, this should check the next 8 rows of DR data signal is the path, such as the normal replacement 74HC245 if not good then replace the first one 74HC595.

7. The STB and CLK signals on this board are common and the data is separate (if it is also T12 interface data). If the T08A board is checked, the upper and lower boards must be checked separately.

8, if the board has a light is not lit: check whether the virtual weld, replace the lamp.

9, there are four vertical lights are not lit: the first inspection whether 74HC595 Weld; the second replacement 74HC595; third replacement lamp.

10, there are 3 in the 4 lights are not lit 1 normal: replace the normal lamp.