The LED display system operation process of common fault and its elimination method

The whole led screen not bright (screen)
1, testing power whether electricity.
2, detection communication lines, whether through without faulty. (synchronous screen)
Three, synchronous screen detection send CARDS and receive cartoon - without flashing green.
4, computer monitors whether protection, or screen shows field is black or pure blue. (synchronous screen)
The entire block unit board not bright (led sign)
1, successive a few board), check the direction not bright normal unit plate with abnormal units board between row line and connection are connected; Or chip is normal or not 245.
2, successive a few blocks, not bright vertical plate direction Russian power supply is normal inspection.
Unit board uplink not bright
1, check with HangJiao 4953 or whether there is general 127 output feet.
2, check whether normal. 138
3, check whether 4953 or burning or burned 127.
4, check whether there 4953 or 127 high level.
5, check with 4953 or 127 control 138 whether there is the feet.
Unit board not bright
1, check p.p.423-430 are normal.
2, check whether general upper module corresponding feet through.
3, check p.p.423-430 output feet to the module whether there is the feet.
Unit board lack of color
1, check whether there is output data r. gutierrez 245
2, check the normal 749-1 755 feet and abnormal p.p.423-430 output whether there is the input feet.