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<p>With the expansion of the market, LED display products are widely used, and the competition among <a href="https://www.atop8.com/" rel="noopener noreferrer" target="_blank"><strong>LED display manufacturers</strong></a> has become increasingly fierce. Due to the continuation of the price war, the quality of LED displays has been severely affected. As a traditional electronic device, various problems are common. The following mainly introduces some common faults and solutions of LED large screens.</p><p><br></p><p>Method/Step</p><p>First. The whole screen is not bright, and the whole screen is black</p><p><br></p><p> 1. Check whether the power supply is energized.</p><p> 2. Check whether the communication line of the synchronization screen is connected or not.</p><p> 3. The synchronization screen detects whether the green light of the communication between the sending card and the receiving card flickers.</p><p> 4. If it is a synchronous screen, whether the computer monitor is protected, or the display area of the screen is black or pure blue.</p><p><br></p><p>Second. The whole unit board does not light up</p><p><br></p><p> 1. The horizontal direction of several consecutive boards is not bright, check whether the cable connection between the normal unit board and the abnormal unit board is connected; or whether the chip 245 is normal.</p><p> 2. The longitudinal direction of several consecutive boards is not bright, check whether the power supply of this column is normal.</p><p><br></p><p>Third. The whole unit board does not light up</p><p><br></p><p> 1. The horizontal direction of several consecutive boards is not bright, check whether the cable connection between the normal unit board and the abnormal unit board is connected; or whether the chip 245 is normal.</p><p> 2. The longitudinal direction of several consecutive boards is not bright, check whether the power supply of this column is normal.</p><p><br></p><p>Fourth, the unit board does not light up</p><p><br></p><p> 1. Check whether 595 is normal.</p><p> 2. Check whether the corresponding pass pins of the upper and lower modules are connected.</p><p> 3. Check if there is a connection between the 595 output pin and the module pin.</p><p><br></p><p>Fifth, the unit board lacks color</p><p><br></p><p> 1. Check whether the 245 R.G data is output.</p><p><br></p><p>Sixth, a unit board does not light up</p><p> 1. Whether +5V power or GND is supplied</p><p> 2. Is +5V and GND short circuit?</p><p> 3. Does the OE signal of 138 fifth leg have</p><p> 4. Whether the OE signal connected to 245 is normal (open circuit or short circuit);</p><p> method:</p><p> 1. "Power +5V or GND</p><p> 2. "Disconnect the short-circuited one" and supply the OE signal</p><p> 3. Connect the open circuit and disconnect the short circuit</p><p><br></p><p>Seventh, the half or lower part of a unit board is not bright or displayed abnormally</p><p> 1. Whether there is OE signal on the 5th leg of 138;</p><p> 2. Whether the signals of the 11th and 12th legs of 74HC595 are normal; (SCLK, RCK)</p><p> 3. Whether the connected OE signal is normal; (open circuit or short circuit)</p><p> 4. Whether the SCLK and RCK signals of the dual-row pins connected to the 245 are normal; (open circuit or short circuit)</p><p>method:</p><p> 1. Connect the OE signal</p><p> 2. Connect SCLK and RCK signals</p><p> 3. Connect the open circuit and disconnect the short circuit</p><p> 4. Connect the open circuit and disconnect the short circuit</p><p><br></p><p>Eighth. A row on a unit board or the row of a corresponding module is not bright or displayed abnormally</p><p> 1. Check whether the line signal pins of the corresponding module are soldered or missed;</p><p> 2. Check whether the corresponding pin of the line signal and 4953 is disconnected or short-circuited with other signals</p><p> 3. Check whether the up and down resistance of the line signal is not soldered or missed</p><p> 4. Whether the line signal output by 74HC138 and the corresponding 4953 is disconnected or short-circuited with other signals</p><p><br></p><p>method:</p><p> 1. Solder the missing and missing welding</p><p><br></p><p> 2. Connect the open circuit and disconnect the short circuit</p><p> 3. Fill up the unsoldered supplies and weld the missing ones</p>
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