LED display maintenance technology problem and solution!outdoor electronic advertising led display screen direct sales

　　First, the problem: The entire unit is not bright, that is, the legendary (black screen)!

　　Solution: If there are several consecutive boards in the horizontal direction, check whether the line connection between the normal unit board and the abnormal unit board is connected! Or is it normal for chip 245. However, if the vertical direction of a few consecutive boards is not bright, check whether the power supply of this column is normal.

　　2. Difficulty: The entire screen is not bright (all black screen)

　　1. Detect whether the power supply is powered on.

　　2. Check whether the communication line is connected and whether there is a mistake. (Synchronous screen)

　　3. Synchronous screen detection cards and receiving card communication green lights are flickering.

　　4. Whether the computer display is protected, or the display field of display is black or pure blue. (Synchronous screen)

　　Third, the unit board is not bright

　　1. Check whether the foot feet are available with 4953 output feet.

　　2. Check whether 138 is normal.

　　3. Check whether 4953 is hot or burned.

　　4. Check whether 4953 has high levels.

　　5. Check whether the control foot of 138 and 4953 controls the foot.

　　Fourth, the unit board is not bright

　　1. Check whether 595 is normal.

　　2. Check whether the upper and lower modules correspond to whether the foot is connected.

　　3. Check whether the 595 output foot to the module foot is common.

　　Five, unit board lack of color

　　1. Check whether 245 R.G data is output.

　　2. Check whether the normal 595 output foot is connected with the abnormal 595 input foot.

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