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Graphics Card Settings


This instruction uses ATI RADEON 9550 computer graphics as an example to illustrate, if you are currently using other graphics, please treat it as a reference.

Note: There are 3 set items in graphics settings, in which the 2nd and 3rd options of the graphic card driver software must be met. This means you have to install the corresponding graphic card driver for the graphic card.

1:The refreshing frequency of the screen must be set to 60Hz, otherwise no image will be displayed.

2:The display option should be set to 'copy' mode. Note different graphic card will have different name for the copy mode.

3:The video mode and movie mode of the ATI 9550 graphic card software should be identical. (in the drop-down list) Graphics card Abnormality


I. The entire screen fails to brighten up (black screen).

1:Check the power input.

2:Check the wire connections. (synchronous screen)

3:Check if the indicating green light of the synchronous screen detection sending card and receiving card are flickering.

4:Check if the computer display is protected or the display field is black or pure blue. (synchronous screen)


II. The entire unit board fails to brighten up (black screen).

1:If some successive blocks fail to brighten up in the horizontal direction,check the wire connection between normal unit block and abnormal block or check if core 245 is normal.

2:If some successive blocks fail to brighten up in the vertical direction, check if the power supply is normal for this column.


III. The upper line of the unit board fails to brighten up

1:Check if the upper line is correctly connected with the 4953 output line.

2:Check if 138 is normal.

3:Check if the 4953 line is getting hot or burnt down.

4:Check if the 4953 line has high level.

5:Check if the control lines of 138 and 4953 are connected.


IV. The Unit board fails to brighten up

1:Check if 595 is normal.

2:Check if the corresponding upper and lower modules are connected.

3:Check if the 595 output line is connected to the module line.



Step 1: Check whether the graphics card settings are correct or not. Please refer to the electronic document in the given disk for setting details.

Step 2: Check the basic system links, such as DVI line, string socket, the connection between main control card and PCI insert slot, serial cable connections, etc. The detailed linking method is shown in the given illustration.

Step 3: Check if the computer and LED supply meets the using requirement. When the LED screen has not enough power, the image displayed will tend to white and begin to flicker. To avoid this, please use suitable power supply accordingly.

Step 4: Check if the green indicator light of the sending card is flickering regularly. If so, please refer to 

Step 5: Please set up according to the software instruction or perform reinstallation until the green indicator light of sending card start to flicker,otherwise repeat step 3.

Step 6: Check if the green indicator light of receiving card (data light) is synchronously flickered with the sending card indicator light. If so, go to step 8 and check whether the red light (Power) lights on. If lights on, go to step 7,if not, check whether the yellow light (power source protection) lights on. If the yellow light fails to brighten up, check whether the power source is misconnected or lack of output. If the yellow light lights on, check whether the source voltage is 5V. If so, switch it off, leave out the adapter card and arranging wires and retry. If the problem is still not solved, the receiving should be replaced and then repeat step 6.

Step 7: Check whether the network line is correctly connected. The standard super 5 network line must be used and the maximum length of the network line should be less than 100 meters without repeater. Check whether the network is manufactured according to the given instruction. If not solved, please replace the receiving card and repeat step 6.

Step 8: Check if the power indicator light for the LED screen lights up. If not,go to step 7 and check whether the defined line of adaptor card port is matching with the unit board.

Note: Most LED screens will encounter partial image absence or blurring image.

This is caused by un-firm RJ45 port connection or lack of connection with the receiving card power source. Please re-plug or replace the network wires or plug in the receiving card power source (note the direction).


Outdoor Module Maintenance


1.Chunks of modules fail to brighten up or encounter abnormality successively:

Check whether the arranging wire of the first abnormal module (counting from the input signal side) is correctly connected with the power source wire. If the LED on the module fails to light on, please check the power source input using a multi-meter. If chaotic color occurs (colorful, chaotic bright dot), please check whether the arranging wire of the first abnormal module is connected firmly. If the problem is not solved after several times of re-plugging, replace with new arranging wire.


2.Single unit of module fails to brighten up:

Check whether the power supply of this unit is correctly connected, especially take note on the electric outlet.

If the whole unit encounters chaotic color or uneven color with the right image pattern, the arranging wire must be undertaken poor contact. Please re-plug the arranging wire. If the problem still occurs after re-plugging, please check the port of PCB board.


3:Single LED fails to light on:

Check the LED using a multi-meter. If the LED is broken, replace it according to clause 5. LED testing method: set up the multi-meter to resistance X1. For pointer type multi-meter, attach the black pointer to the anode and the red pointer to the cathode. (digital multi-meter requires black pointer to the cathode and red to the anode). The LED is broken if it fails to light on.


4:LED bad point maintenance (out of control point): After confirming the damaged LED with single LED test, the following maintenance methods can be used according to different requirements.

4.1: Front Side Maintenance:

Loose the screws of the front mask using a corresponding screw driver (take care of the loosen screws). Remove the mask and perform LED replacement (refer to clause 5). After successful replacement and sealing, put back the mask and tighten it with the original screws (note not to press the LED). Carefully remove any colloid residues on the LED.

4.2 Back Side Maintenance:

Loose the screws of the back side using a corresponding screw driver (take care of the loosen screws). Unplug the signal arranging line. Avoid to unplug the power source wire. Take out the module from the sheet metal hole and move it to the back of the case body. Perform single LED maintenance according to front side maintenance method above.


5: LED replacement:


Remove the colloids on the broken LED using sharp tools such as tweezers so that the LED stitch can be clearly seen. Hold the LED using tweezers with the right hand and use soldering iron to contact with the soldering tin for no more than 3 seconds (if not fully removable, please try again after cooling it down), remove the LED with tweezers when the soldering tin melts. Note the temperature of the soldering iron should be around 40 Celsius degree, higher temperature will cause the LED to be damaged. Insert the correct LED into the PCB circuit board hole (the long foot of the LED is the anode and the short one is the cathode, the 'square hole' on the PCB is the anodic pin-in hole and the 'round hole' is the catholic pin-in hole). Melt some soldering tin and place them onto the soldering iron head, adjust the LED direction with the tweezers and solder the LED and PCB together with soldering tin. Finally use some colloids (with a PH value of 7) to seal the LED.


Faults and Troubleshooting of LED Module


1: Phenomenon: All LEDs are flickering


Problem: Poor contact


Solution: Fix or re-establish the connections of the loose places.


2: Phenomenon: LED dims


Problem: The voltage of the power source is differed from the LED voltage specification.


Solution: Make sure the voltage of the power source is identical to the LED voltage specification.


3. Phenomenon: Some LEDs of partial circuits fail to light on.


Problem: a. Incorrect connecting direction.

               b. Incorrect power output connection.

               c. Reversal power wire plugging.


Solution: a. Unplug it and reconnect with the correct direction

               b. Make sure that the red wire is connected to the anode and the black wire is connected to the cathode.

               c. Find the reversal plugging power wires and reconnect them.

               d. Phenomenon: All LEDs fail to light on 


Problem: a. The power source does not output any voltage.

               b. Incorrect power output line connection. 


Solution: a. Input electricity to the power source terminal.

               b. Make sure the anode and cathode are correctly connected.

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