|
Phenomenon |
Faults |
Solution |
|
No display in the whole screen. |
a. No AC power supply.
b. The computer doesn’t operate.
c. Communication cable is broken.
d. Control system is broken.
e. Receiving card is no power.
f. Software setting is wrong. |
Examine the communication cable, and reconnect correctly.
Change the control system.
Receiving voltage is 5V.
Correct the software setting to suit the control system. |
|
Twinkling in the whole screen. |
a. Ground wire is broken.
b. Control system is broken down.
c. Some signal of the communication cable is lost.
d. Voltage of the control system is abnormal.
e. Software setting is wrong. |
Connect the ground wire between the computer and screen.
Change the control system.
Examine the communication cable, reconnect correctly.
Voltage of the control system is 5V.
Correct the software setting suit to the control system. |
|
Unit panel is not light. |
a. Unit panel voltage.
b. Communication cable between the unit panels is cut off.
c. HC244/HC245 is broke down. |
Voltage of the unit panel is 5V.
Change the communication cable.
Change HC244/HC245 |
|
Half of unit panel is not light. |
Signal of the half of unit panel is wrong. |
Check if CP, SC and CT are normal.
Examine if the pin 14 of the first HC595 of the data signal is normal. |
|
Rows of LED are not lighting
Columns of LED are not lighting
Dots out of control |
a. Corresponding4953 or HC138 is not working.
b. Corresponding HC595 is not working
c. Display unit H and R (or G) is short. |
Examine the corresponding 4953 or HC138.
Examine the corresponding HC595.
Take off the short dot. |
|
The display texts have shadows.
The display pictures have dragging dots. |
a. CT Signals
b. CP Signals |
Examine if the CT signal between HC244 to HC14 and HC138 is normal.
The CP signal of this row of the first unit panel is put a 100 Ω or 200 Ω resistor to the ground in series. |
