Diffused Silicon Pressure Sensor The diffusion silicon Pressure Sensor adopts the diffusion silicon piezoresistive pressure sensor with stainless steel isolation film as the signal measuring element, the signal processing circuit is located in the stainless steel housing, the sensor signal is converted into standard 4-20mA current or RS485 signal output through the professional signal conditioning circuit. Widely used in petroleum, chemical, metallurgy, electric power and other industrial process on-site measurement and control. Diffused Silicon Pressure Sensor,Silicon Pressure Sensor,Silicon Pressure Transducer,Silicon Diaphragm Pressure Sensor Xi'an Gavin Electronic Technology Co., Ltd , https://www.gamicos-meas.com
LED display common faults and treatment methods
Nowadays, with the expansion of the market, LED display products are widely used, and the competition among LED display manufacturers has become increasingly fierce. As the price war continues, the quality of LED displays has been seriously affected. As traditional electronic devices, various problems have also become common. The following mainly introduces some common faults and solutions of LED large screens.
First, the entire screen does not shine, the entire screen black screen
1. Check if the power is on.
2. Check whether the synchronization screen communication line is connected and whether it is connected or not.
3. The sync screen detects whether the sending card and the receiving card communicate green light flicker.
4. If it is a sync screen, whether the computer monitor is protected or the display area is black or pure blue.
Second, the whole unit board is not bright
1. If several consecutive boards are not in the horizontal direction, check whether the cable connection between the normal unit board and the abnormal unit board is connected; or whether the chip 245 is normal.
2. When several boards are not in the vertical direction, check whether the power supply of this column is normal.
Third, the unit board does not shine
1. Check if there is any communication between the line foot and the 4953 output pin.
2, check 138 is normal.
3, check 4953 is hot or burned.
4, check 4953 whether there is a high level.
5. Check whether the 138 and 4953 control pins are connected.
Fourth, the unit board is not bright
1, check 595 is normal.
2. Check whether the corresponding module is connected to the upper and lower modules.
3, check 595 output pin to the module pin is connected.
Fifth, the lack of color unit board
1, check 245 RG data output.
Six, a unit board is not bright
1, +5V electricity or GND is supplied
2. Is short circuit between +5V and GND?
3,138 Whether the OE signal of the fifth leg is
4,245 whether the connected OE signal is normal (open circuit or short circuit);
Method: 1," Give +5V or GND
2. "Disconnect the short circuit" Supply OE signal
3. Disconnect the short circuit of the circuit breaker
Seven, a half or lower half of the unit board is not lit or displayed abnormally
Is there a 5th leg OE signal for 1,138?
2. Signals of the 11th and 12th legs of the 74HC595 are normal; (SCLK, RCK)
3, the connected OE signal is normal; (open or short circuit)
4. Is the SCLK and RCK signal of the double row pin connected to the 245 normal? (Open or short circuit)
Method: 1. Connect the OE signal
2, the SCLK, RCK signal connected
3, the disconnection of the short circuit of the good
4, the disconnection of the short circuit of the good
Eight, a line on a cell board or a corresponding module line is not lit or abnormal display
1. Check whether the pin of the line signal of its corresponding module is in the form of a virtual weld or a missing weld;
2. Check if the corresponding signal of the line 4593 is disconnected or short circuited with other signals.
3. Check whether the up and pull-down resistors of their line signals are not soldered or missed.
4,74HC138 output line signal and the corresponding 4953 is disconnected or shorted to other signals
Method: 1, good welding, missing welding welding
2, the disconnection of the short circuit of the good
3, no welding to make up for welding welding
The above are some common troubleshooting methods. If you can not rule out the failure of the LED large screen, it is best to find a professional maintenance company.