Common faults and maintenance of LED display.led screen front service

　　In the process of repairing the LED display, the company's engineer summarized many LED display failure problems solutions. Today I will share it with you. I hope it can help everyone's work and maintenance and maintenance of LED display.

　　1. Check whether the power supply power supply is connected to the signal line.

　　2. Check whether the test card uses the recognition interface. The tested card red light flash is not recognized. Check whether the lamp board is the same as the test card, or the lamp interface has a signal and the short circuit of the ground to cause the interface to be unable to recognize. (Smart test card)

　　3. Detection 74HC245 There is a short circuit of welding, and the corresponding enable (EN) signal input and output foot on the 245 is virtually welded or short -circuited to other lines.

　　Note: Mainly check the power supply and enable (EN) signal.

　　When the LED display is scanned, the regular interval is not bright. The display screen overlap

　　1. Check whether the input port of A, B, C, and D has a disconnected or virtual welding or short circuit between the input ports of A, B, C, and D.

　　2. Detect whether the corresponding A, B, C, D output end of 245 or whether the output end of the A, B, C, and D and 138 is disconnected or virtual welded and short -circuited.

　　3. Detect whether the signals of each A, B, C, and D are short -circuit or a signal and a short circuit.

　　Note: Mainly detect ABCD line signals.

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