Led sign | signs issue repair

How to repair the led signs issue,after read the below page will give some help.

A)the led sign not display or display grid
1.check your computer if startup(suppose it's synchronization) 2.check the data line if connect 3.the sending card if plug. 4.check your computer screen if protect stat,we recommand do not set screen protect.

B)start the softerware cannt find the digital sign signal
the COM interface or RJ45 interface between the sending card data line not connect,or the COM interface have issue

C)the whole electronic sign shake
please the display card between sending card DVI line

E)the led sign module not display
the whole displays module not display,check the issue led signs module with the right led sign module,or check the chip 245 if right
the whole upright digital sign not display,check the power supply,+5v or GND if connect,or +5v with gnd if short circuit.
the electronic sign one line not display,check the 4953 chip if cold joint
the electronic sign two line display(one line display right,one line still display),check the two line signal if short circuit.