Home > News > LED Display Learning > The LED display common fault and its elimination method

LED Display Learning

The LED display common fault and its elimination method
2014-05-06 12:16:55
Download
 

The LED display common fault and its elimination method:how to maintain led panel wall

 
A.the whole screen panel be not work 
 
1, Checking the power supply and if it is electricity. 
 
2, Ckecking the signal cables , if it right meet .(synchronous screen) 
 
3, Checking the green indicator light of sending card & receiving cards. 
 
4, Chicking the computer monitors whether protection, or screen shows field is black or pure blue. (synchronous screen) 
 
 
 
B, The whole piece of unit board not bright 
 
1, successive a few boards horizontal direction not bright, check the normal unit plate and abnormal units board between row connection are on line; Or chip 245 is normal or not. 
 
2, successive a few boards longitudinal direction not bright, check the effect of power supply is normal or not. 
 
 
 
C, Up of unit board not bright 
 
1, Checking LEDS and 4953 feet if there is the output. 
 
2, Checking 138 is normal or not. 
 
3, Checking whether 4953 burning or burned. 
 
4, Checking whether there is a high level of 4953. 
 
5, Checking 138 and 4953 control and meet. 
 
 
 
D, Unit board be not bright 
 
1, Checking the 595 work or not. 
 
2, Checking the modules of up and down corresponding feet is through. 
 
3, 595 feet to the module output check whether there is the feet. 
 
 
 
E, The unit board lack of color 
 
1, 245 R.G check whether there is output data. 
 
 
 
F, One unit board not bright 
 
1, + 5 V electric or GND whether supply 
 
2, + 5 V GND whether with short circuit 
 
3, 138 fifth leg of the signal whether OE 
 
4, 245 connected signal is normal OE (open circuit or short circuit); 
 
Methods: 
 
1, "give + 5 V battery or GND 
 
2, "a short circuit to disconnect" to signal the OE for 3 the breakers, even to the short circuit to disconnect H, Up of board or down of board doesn't work or not normal show 1, Weather have the OE singal with 138 the fifth leg; 2, Weather have the singal between 11 and 12 leg for 74 HC595 ; (SCLK, RCK) 
 
3, Weather is normal along the connected signal OE; (open circuit or short circuit) 
 
4, Double row in 245 SCLK connected with the needle, RCK signal is normal; (open circuit or short circuit) 
 
Methods: 
 
1, connect the OE signal 
 
2, connect the SCLK, RCK signal 
 
3, connecy the breakers, even to the short circuit connection 
 
4, connect the breakers, even to the short circuit connection I ,Up of board or down of board doesn't work or not normal show 
 
1, Checking the corresponding modules' signal for pin whether is empty welding or leakage welding; 
 
2, Checking the adults signal and 4953 of the corresponding tube feet whether disconnect or with other signals to short circuit 
 
3, Checking a bloom of the signal, and down the resistance is not welding or leakage welding 
 
4, 74 HC138 output signal line with corresponding between 4953 whether disconnect or with other signals to short circuit Methods: 1, the virtual welding, leakage of welding to weld 
 
2, the open circuit of even the disconnection of the short circuit 
 
3, the welding of up to not the leak of welding to welding

Previous   [Return Home] [Print] [Go Back]   Next

Brand Zone

Contact Us

点击这里给我发消息
Google+