Repair LED display tips

Tips for repairing LED displays Full-color led displays are commonly used outdoors as large screens. Many activities are applied to displays, such as dinners, wedding receptions, stage shows, square displays, etc. When the display screen is used as an important modern display device. , Let's make a simple maintenance analysis on the maintenance of several small points. The first necessary tools are multimeters, electric irons, blades, and tweezers. Judgment of the problem must be dealt with by the primary and secondary modes first, with obvious and serious first steps and minor problems afterwards. Short circuit should be high priority. 1 observation method, observation method and screen naked eye observation, sometimes broken circuit can be seen with the eyes, such as the PCB circuit due to scratches, making it broken, and sometimes the electric drill accidentally broke! 2 contrast method, contrast method is very Important is also very important, sometimes IC we can not see with the naked eye whether it is burned, can be replaced with a good IC, sometimes the signal we do not remember whether it is the same, we can take a good cell board to measure the corresponding position is what !The contrast method is very important! 3 Exclusion method, sometimes there are many reasons for a failure, we can deal with them one by one, do not remember you can look at the processing of common faults in front of, one by one to rule out! 4. Resistance test method , Adjust the multimeter to the resistance file, detect the resistance value of a certain point of a normal circuit board to the ground, and then test whether the same point of another same circuit board is tested and the normal resistance value is different. If it is different, then it is determined. The scope of the problem. 5, voltage detection method, the multimeter is transferred to the voltage file, to detect the voltage of the point of doubt of the circuit of a certain point to the ground, compare whether it is similar to the normal value, otherwise determine the scope of the problem. 6, short-circuit detection method, the multimeter will be transferred to the short-circuit detection block (some diode pressure drop or resistance file, generally with alarm function), detect whether there is a short circuit phenomenon, found that the short-circuit should be given priority to solve, so that it does not burn out Other devices. This method must be operated with the circuit powered down to avoid damage to the watch. 7. The voltage drop detection method adjusts the multimeter to the diode voltage drop detection file, because all the ICs are made up of many basic unit elements and are only miniaturized, so when there is a current passing through one of its pins, There will be a voltage drop on the pin. Generally, the voltage drop on the same pin of the same type of IC is similar, and the voltage drop on the pin is better or worse, and the circuit must be operated with the power off. This method has certain limitations. For example, if the device under test is high-impedance, it cannot be detected. Perhaps the method is far more than these, but we are familiar with these methods and it is almost! Repair I did not sum up three points: Point: a lot of short circuit faults are actually caused by a short circuit, we just need to deal with the short circuit can be The second point: the broken circuit by definition is the signal interruption, we only need to connect the signal to the interrupt line OK! The third point: IC damage IC damage this nothing to say, use the above method to judge, can be bad Replacement can be! The simple maintenance of the LED display is also one of the advantages of the display, whether it is the display manufacturer technicians or maintenance personnel of the display, should master these basic maintenance points and methods. For more consultation, please pay attention to Wuhan Forest Century Advertising Co., Ltd.