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LED display IP protection level is what is going on?
IP protection class is composed of two digits, first lamps, said digital dust level to prevent intrusion of foreign objects, second digital said sealed moisture resistant, waterproof lamp intrusion, the larger the number the higher the level of protection
Product design and component selection by inspection and verification
LED as one of the most promising high-tech industries in twenty-first Century, product design, research and development, application and testing and certification of concern. Although the detection and authentication of LED products is the last part of the product entering the market, it has important instruction significance to the product design stage. Rational product design can enhance product reliability, reduce the problem of EMC, faster through product testing and certification, to win the market and the long-term development of enterprises. In the near future LED Industry Summit held in the electronic component technology network interview with Mr. Nie Pengxiang, share the views of the current development of the LED Market
Common problems and troubleshooting of LED display screen
The fault phenomenon may cause the removal method of picture screen does not work, send card lights black screen no power line not connected receive or send card without power supply low voltage power supply card bad signal transmission intermediate devices connected or faulty (such as: function card, repeaters) check screen power supply normal check reconnect the cable to ensure the power supply output DC power supply in the 5-5.2V to replace the sending card check connection or replacement card (repeater) screen does not work, no flicker light transmitting card black DVI line missed good graphics card is set incorrectly selected software
Unit plate is not bright - display exception
Check 595 is normal
Check the upper and lower module corresponding to the foot is connected
Check the 595 output pin to the module.
Unit plate missing color display exception
Check the output of 245 R.G data
Check the normal 595 output pin with the exception of the 595 input pin
Problems and solving methods of driving part
Unit plate is not bright
Question: 1, GND or +5V power supply solutions: to +5V or GND
Question: 2, +5V and GND whether the short circuit solution: the short circuit to break
Question: 138, fifth legs of the OE signal whether there is a solution: the OE signal for
Question: 4, 245 connected OE signal is normal (open circuit or short circuit) to solve the method: the disconnection of the circuit breaker to break open
Half part of a unit plate or the lower part of the unit is not bright or the display is not normal.
Question: 138, fifth of the 1 leg OE signal whether there is a solution: the OE signal connected
Question: 2, 74HC595 eleventh, 12 leg signal is normal; (RCK, SCLK) solution: the SCLK, RCK signal even good
Question: 3, connected OE signal is normal; (open circuit or short circuit) to solve the method: the disconnection of the circuit breaker
Question: 4, double pin and 245 connected SCLK, RCK signal is normal; (open or short) solution: the circuit connected to the circuit disconnect
A row or a row of a unit or a corresponding module of a unit is not bright or not normal.
Question: pins 1, check the signal corresponding to the module is weld or leakage welding solution: to weld and weld for welding
Question: 2, check the line signal and 4953 corresponding to the tube foot whether or not to open or with other signal short circuit solution: the circuit breaking up the short circuit
Question: 3, check the line of the signal, the drop resistance is not welded or leak welding solution: the no welding to fill the leakage of the welding to the welding
Question: 4, 74HC138 output of the line signal and the corresponding to the 4953 whether or not to break open or short circuit with other signals to solve the method: the disconnection of the circuit breaker
A unit plate has two lines and a line of light (which is normal, a row of Chang Liang).
Question: 1, check the module corresponding to the two line signal is short circuit to solve the method: the short circuit fault
Question: 2, view 138 of the output legs, on the drop resistance and module pin and 4953 are short circuit solutions: the short circuit fault
The red or green or green display of the upper part or lower part.
Question: 1, check the input pin foot is normal or with GND and +5V short circuit solution: circuit breaker connection
Question: 2, check the input pin to signal between the 245 is normal (short or open) solution: short circuit disconnect
Question: 3, IC245 bad solution: replace IC
Common solutions for small fault in control system
The whole screen is not bright or appear square
Reason
Control host is open
Communication line is plugged well
Send card if it is plugged in
Multimedia card and card, send card between the data line is good or not.
Receiving card JP1 or JP2 switch position is not
solution to
Open host
Plug in the communication line.
Insert the card
Even good multimedia card and card, send card between the data line.
Adjust JP1, JP2 switch position
Computer monitors are protected, or display areas are black or blue. (Tong Buping)
When you start the LED studio, you can't find a control system.
Reason
COM port to data transmission card between the signal acquisition line is not connected or the computer itself
COM mouth is bad
solution to
Connect the data cable or replace the computer
The screen of the entire screen shaking or weight
Reason
Check the communication line between the computer and the big screen.
Check the DVI line for the multimedia card and the card.
Send card bad
solution to
Plug or replace the cable plug and replace the DVI line plug and insert reinforcement to replace the transmission card