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First, LED display no signal output, because the control card voltage is not normal, flat cable plug the direction is not correct, send, receive card, check, the voltage is adjusted to the normal value, the card problem, replace.
Second, the entire screen does not shine or appear squares 1, control the host is turned on, open the host 2, the communication line is plugged in, the communication cable is plugged in 3, the sending card is inserted, send the card reinsertion 4, multimedia card With the acquisition card, the data cable between the sending card is connected well, even if the data line 5 and the receiving card JP1 or JP2 between the multi-media card and the acquisition card sending card are in wrong position, adjust the JP1, JP2 switch position three times. When starting the LED studio, it was found that the signal acquisition line between the COM port of the control system and the data sending card was not connected or the COM port of the computer itself was not connected. Connect this data cable or change the computer. 4. Check the settings in the LED studio for flashing or lighting 16 rows across the entire screen. Turn on the LED studio. Open Debug - Hardware Setup (password 168) - System Settings, set the row order to +0 or +1
5. Shake or ghost the whole screen 1. Check the communication line between the computer and the big screen and re-insert or replace the communication line.
2. Check the DVI cable of the multi-media card and the sending card, insert the DVI cable for punching and reinforcement 3, send the card bad, replace the sending card six, and whether the unit board is off, +5V or GND is supplied, and apply +5V or GND
2. If +5V and GND are short-circuited, disconnect the short circuit.
3,138 Whether the OE signal of the fifth leg is present or not, the OE signal is supplied.
4, 245 connected OE signal is normal (open circuit or short circuit), the disconnection of a good short-circuit to the disconnect;
7. Whether the half or bottom half of a unit board is off or shows abnormal ONE signal of leg 1 and 138, and whether the signals of leg 11 and 12 of 2, 74HC595 are connected to the OE signal is normal; SCLK, RCK)
3, the connected OE signal is normal; (open or short circuit), the SCLK, RCK signal connected 4, the double row pin and 245 connected SCLK, RCK signal is normal; (open or short circuit), the disconnection of the good The disconnection of the short circuit, a row of a unit board or a line of a corresponding module is not lit or abnormal display 1. Check whether the pins of the line signal of the module corresponding to the short circuit are in the form of a virtual weld or a missing weld; The welding is good.
2. Check whether the pins corresponding to the TIP127 or 4953 line are disconnected or short-circuited with other signals, and disconnect the short circuit of the disconnected line.
3. Check whether the upper and lower pull-down resistors of the row signals are not soldered or soldered. Solder the non-welded fillers to the solder joints.
4. Whether the 74HC138 output line signal is disconnected from the corresponding TIP127 or 4953 or short-circuited with other signals, and the disconnected line is short-circuited.
Nine, a unit board has two lines at the same time bright (in the display text, one line is normal, one line is always on)
1. Check whether the two lines corresponding to the module are short-circuited, disconnect the short circuit 2, check to see if the output leg of the 138, the upper pull-down resistor and the module pin, and the output leg of the TIP127 are short-circuited, and disconnect the short circuit. The half or lower half of the red or green is not lit or is not normal. 1. Check if the input pinout is normal or short circuit with GND, +5V.
2. Check if the signal between the input pin header and 245 is normal (short circuit or open circuit) and connect the circuit breaker.
3, IC245 bad, replace the IC eleven, LED display screen shaking phenomenon, one is the control card, multimedia card address is not correct, re-adjust or replace. Another kind, if there is a slight jitter in the whole screen, it is because the power supply of the display screen is insufficient and the power supply can be measured. If the power supply voltage is lower than 190V, please adjust it to normal. If the power supply voltage is constant, please contact the company. Twelve, LED screen full screen bright line, because the computer crashes or power failure, restart the computer.
Thirteen, the partial display board does not light, and all are followed by a long bright line, because the switching power supply to the board to provide +5V power is not output, that is, power supply failure, you can first turn off the screen, measure whether the +5V power supply and 0V between Short circuit. (Normally about 15Ω, less than 12Ω can be a short circuit, if the short circuit to find the short circuit, if the normal value of the cathode, indicating that the power supply is damaged, it must be replaced.
XIV. Two lines of the display unit are not on because the HC245 integrated block is abnormal and must be checked and replaced.
15. If the computer is powered off, the reason for powering down the computer is that the power supply is insufficient, and the computer and the LED display are used in the same way. Therefore, it is recommended that the user's display screen use only one power supply to avoid electrical interference with the computer.
Talking about the failure of full-color LED display and its elimination
Full-color LED display failure and troubleshooting: