When we want to do LED display, we must first prepare the material. One display covers the outer part of the frame, the display part, the tanning part, the power supply part and the small parts.
LED display material
1. Part of the outer frame: special aluminum profile, corner, light steel keel, tailgate (aluminum composite panel, Ou Songban)
2. Display part: unit board. The accessories cover: cable power cord.
3, tanning part: 扼 card, adapter board, cable. Note! (Individual clamping cards do not need adapter plates and cables)
4, power supply: 220V-5V power supply. Commonly used are 40A, 30A. It depends on the situation of the work.
5, small accessories: 16P cable, 16P card and clip, three core value line, DB9 head (needle, hole) DB9 plastic shell, power cord, self-tapping. Strong magnet (support column and magnetic sheet)
6, tools: cutting machine, crimping tools, electric iron, wire strippers, screwdrivers.
LED display assembly steps
To make a display, first confirm the volume of the outer frame. Below I explain the method of sub-frame cutting. Take the most commonly used 3, 5*90 profiles and P10 cell boards as examples. The display volume is 2 blocks * 5 blocks.
1. Confirm the size of the unit board to be very accurate to the millimeter. Take the P10 unit board: its size is 16cm*32cm.
2. Calculate the net size of the height and width of the unit board in the display. For example, the height is 2 pieces *16cm=32cm width is 32cm*5 pieces=160cm
3. Subtract 4mm from the calculated net size. As mentioned above, the net size is 32cm*160cm. Then the aluminum size should be (32cm-4mm)*(160cm-4mm)=31, 6cm*159, 6cm. . 31, 6 and 159, 6 are the actual dimensions of the aluminum, and the display must be less than 5 meters and less than 5 meters. 4, the corners and cut profiles with self-tapping, and thoroughly cleaned up the debris, placed face down.
5, put the unit board in the direction, do not make the wrong direction. The place with the pin must be high toward the profile.
6. Mount the magnet column on the unit board and broadcast the magnet into the bowl of the nursery column.
7. Measure the length required for the light steel keel and cut it off. Place it on the magnet and try to make the magnet in the center of the keel to avoid deviation.
8. Connect the keel with self-tapping and frame.
9. Use the cable to connect the unit board to the bridge type. It is not allowed to have the button on the cable. 10. Fix the power supply to the proper position inside the profile. According to the bottom, you can confirm where the power is placed. The power supply is usually placed on the profile below the exposed screen. Note the insulation from the cell board.
11. Connected to the power cord, the power cord can't be seen clearly. The exposed screen is of course low-voltage office, but the current is very large. It is not possible to come all the way. The full current of a P10 unit board is 4A, which means that a 40A power supply can carry ten unit boards. The lines of the exposed screen are connected in parallel, that is, the positive pole is connected to the positive pole, the cathode is connected to the cathode, the ordinary VCC is +5V, and +V is the positive pole. GND, COM, -V are cathodes. And the positive cathode must not be connected wrong, otherwise the unit blackboard will be scrapped. Example: A 40A power supply has 10 unit boards. We can divide it into three pieces and go to the power supply 5V once, then three times to the power supply, and finally four pieces and connect them to the power supply. . That is to say, each channel does not exceed 4 cell boards, so that the line will not be destroyed due to excessive current.
12. Place the clamping card on the input of the unit board and be sure to supply 5V directly from the power supply. 13. The pins of the card are arranged in order. For example, the position of JK1, JK2, ..., J1, J2, ..., JP1, JP2, ..., etc., must be connected to the unit board at the top of the arrow at the input end of the unit board.
14. Unit board and 扼 的 : : : : : : : : : : : : 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元 单元It is accurate.
15. After the above work is done, the debris in the screen must be thoroughly cleaned and tidyed, avoiding the conductive aluminum tail, iron tail, and the wire head falling into the circuit board to smash the unit board to be destroyed.
16. After thoroughly finishing the work, the power-on test, the premise is to do the value line. Since most of the digital control cards are exposed before they are changed, the abnormality is revealed. So when you meet the power, you will see the messy symbols, dark, bright spots, etc... Don't panic, just make sure that the positive cathode is not connected correctly.
17, the welding method of the numerical line: the ordinary display only uses the three kinds of the lower three. Extension cord: This is what every display needs. As the name implies, its utility is to extend the numerical interface of the card to the exposed screen. Since your display will definitely seal the back cover, you can't change the data once and then remove the cover! The materials he needs are: one does not have a long three-core wire, one DB9 pin, one DB9 hole. The number of soldering points behind each DB9 is marked with the number 6789. We only need to connect the three in the department. These three are 235 needles 2 and the holes 2 are welded with one of the three core wires. 3 and 3 burned and 5 and 5 burned. After you have fixed the plastic case to the end with the needle, (because the hole is inside the screen), OK! The two lines that do not intersect are the same as the extension method. The difference is that the two lines that do not intersect are two. The DB9 hole requires a plastic shell. The staggered line and the material of the two lines that do not intersect are the same. The difference is that the 2 of the staggered line is connected to the other 3, the 3 is connected to the other 2, and the 5 is still connected to 5. The two heads are also required.
18, the staggered line and the disjoint two straight lines are based on the use of the card to vote for the parallel still interlaced.
19, after doing the above work, the rest is adjusted, the premise is that the display must be energized to adjust. I won't introduce it because there are so many adjustments to the card type in the market.
20, after the adjustment, after 2-5 days of testing, if there is no problem, you can cut off the back cover. Finally, you can deliver!
LED display production precautions
1. The unit board and the control card must not be connected to more than 5V.
2. All the positive and negative cathodes must not be connected incorrectly.
3, must be thoroughly cleaned up the debris inside the screen.
4, 220V AC does not distinguish between positive and negative cathodes.
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