Dooh Billboard For Advertising

Products Description

LMA outdoor advertising led display digital screen. It is more in line with the products in the use of British -made units, with simple appearance, strong design, aluminum material body, high product quality, strong environmental compatibility, all aluminum modules, good heat dissipation effects, high -fidelity real picture quality, comfortable viewing effects.

Dual ports module

Dual power/signal ports,hidden design, support left/right modules interchangeable connection. 45°angle design module.

Metal heat dissipation, good sealing effect

The module is equipped with aluminum heat sink, which has high thermal conductivity and good heat dissipation effect, ensuring the stable performance of the screen.High airtight insulating rubber ring, dustproof, waterproof, moistureproof, excellent airtight performance.

Front / Rear maintenance

Without environmental constraintsand support the removal of modules in front and back for maintenance.

Excellent outdoor protection

Full sealed module, side waterproof design, the protection class of the module reaches IP66, sealed power supply design. Dust-proof, moisture-proof, anticorrosion, perfect solution to the three proofings problems of display screen.

Product Picture

Our factory

FAQ

Unit board failure:

The judgment problem must be treated first and then the process of handling, the obvious and serious first -proof, small problems are treated. The short circuit should be the highest priority.

1. The resistance detection method, the multimeter is adjusted to the resistance file, detect the to -land resistance value of a normal circuit board, and then detect whether the same point test of the same circuit board test is different from the normal resistance value. Assuming differently, the siege of the problem is determined.

2. The voltage detection method, the multimeter is adjusted to the voltage gear, and the ground voltage of a certain point of the circuit at the suspected problem is similar to whether it is similar to the normal value or not to determine the circumference of the problem.

3. Short -circuit detection method, the multimeter is adjusted to a short -circuit detection gear [Some are diode pressure drops or resistance files, generally have alarm function], detection whether there is a short circuit, and find that after short circuit Other devices. This method must be operated under the condition of the circuit to prevent the damage.

4. The voltage drop detection method, the multimeter is adjusted to the diode voltage drop detection file, because all ICs are composed of many fundamental units, but they are only small, so when there is a current on its pin, it is outdated. There will be a voltage drop on the pin. Generally, the voltage drop on the pins of the same model of the same model is similar. Depending on the voltage of the pins, the value reduction is better or bad, and it must be operated when the circuit is powered off. This method has a certain limitations. For example, the detection device is highly resistant, and it will not be detected.

A. The whole plate is not lit. Check whether the power supply supply is connected to the signal line. 2. Check whether the test card uses the recognition interface. The test card red light flash is not recognized. Check whether the lamp board is the same as the test card, or the light board interface has a signal and the short circuit of the ground and the ground short circuit causes the interface to recognize. [Intelligent Test Card] 3. Detection 74HC245 is deficient in short circuit, and the corresponding enlarged [EN] signal input and output foot on the 245 will be welded or short -circuited to other lines. Note: Mainly check the power supply and enable [EN] signal.

B. When scanning at point, the regular interval is overlapping. Check whether there is a disconnected or virtual welding or short circuit between the input ports of A, B, C, and D to 245. 2. Detect whether the corresponding A, B, C, D output end of 245 or whether the output end of the A, B, C, and D and 138 is disconnected or virtual welded and short -circuited. 3. Detect whether the signals of each A, B, C, and D are short -circuit or a signal and a short circuit. Note: Mainly detect ABCD line signals.

C. There is a line or a few lines that are not bright at all times. 1, test whether the line between 138 and 4953 is disconnected or welded or short -circuit.

D. When scanning, the two or several lines [usually a multiple of 2, regular] Light at the same time 1. Detect whether the signals of A, B, C, and D are short -circuited. 2. Detect whether the 4953 output end is short -circuit with other output end.

E. There are single or multiple points when they are bright [irregular]. Do not light up. Find whether the control foot measurement corresponding to the module is short -circuited with the bank. 2. Replace the module or single light.

F. There is a column or a few columns that are not bright at all times. 1. Find the pin that controls the column on the module to test whether it is connected to the drive IC [74HC595/TB62726 ,,].

G. There is a single point or a single column high, or the whole line is high, and it is not controlled 1. Check whether the column is short -circuited with the power site. 2. Detect whether the bank is short -circuited with the positive electrode of the power supply. 3. Replace its driver IC.

H. The display is chaotic, but the signal output to the next board is normal. 1. Detect whether the lock end of the STB lock output terminal of 245 is connected to the driver IC's lock terminal or the signal is short -circuited to other lines. I. Display chaotic, abnormal output 1. Detect the clock CLK lock in the STB signal short circuit. 2. Check whether the clock CLK of 245 has input and output. 3. Check whether the clock signal is short to other lines. Note: The main detection clock and lock signal.

J. Show color deficiency 1. Detect whether the data end of the color of 245 has input and output. 2. Detect whether the data signal of this color is short -circuited to other lines. 3. Detect whether the grade data port between the driver IC of this color is disconnected or short -circuited and virtual welded. Note: It is easier to find a problem with the voltage detection method. Detecting the voltage of the data port is different from normal to determine the faulty area.

K. There are problems with output 1. Detect whether the lines of the output interface to the signal output IC are connected or short -circuit. 2. Detect the clock lock signal at the output port normal. 3. Detect whether the level -connected data port between the last driver IC is connected to the data port or short circuit of the data port of the output interface. 4. Whether the output signal is short -circuited or short -circuited. 5. Check whether the output line is good.

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