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Summary of LED unit board failure and maintenance plan
by：Demo
2021-07-07
The led unit board is used very much in the display screen. We also know that no matter what it is, some problems will occur after a long time of use. How much do you know about the maintenance of the led unit board? In this article, Shenzhen Liansen Optoelectronics summarizes the common failures and maintenance solutions of LED unit boards, and share them with you here!
One, the whole board of the led unit board does not LED Light module up
The whole board of the led unit board is not high. At this time, check whether the power supply of the led unit board is connected to the signal line for any problems, and then check the test card of the led unit board. The red light of the test card added to the led unit board flashes, it means that the test card is normal, otherwise it means the contact is poor. Then confirm that the 74HC245 of the led unit board is not short-circuited.
Two, the screen overlap of the led display
At this time, check the A, B, C, D signal input ports of the led unit board, whether there is a disconnection or short circuit between the test port and the 245, and make sure that the A, B, C, D signal output of the led unit board is It's not normal.
Three, all or part of the light is off
If the led display is all on or part of it is not on, it is necessary to check whether the circuit between led unit boards 138 to 4953 is in poor contact or short circuit.
4. When working, one or more points are not lit
First, you need to find the control pin corresponding to the led unit board, and replace the led unit board or indicator light.
5. When scanning, several or more lights up
Check whether the signals A, B, C, and D of the led unit board are short-circuited, and whether the 4953 output terminal is in poor contact.
VI. One or more columns do not LED Light module up during work
Find the points that control the corresponding pin column on the led unit board, and then measure these points to check whether the output terminal of the driver IC (74HC595/TB62726) of the led unit board is connected properly.
Seven, display lack of color
When the display lacks color, it is necessary to check the data terminal of the color of the led unit board to determine whether the data signal connection data of the color output terminal of the led unit board is normal.
Eight, display confusion
Display disorder is mainly the problem of the output terminal. It is necessary to check whether the latch terminal of the output terminal is connected successfully on the led unit board, or whether the signal at the output terminal of the led unit board is short-circuited.
Nowadays, the adoption of About Us in led light engine industry is quite common.
Visit Demo Photoelectric Technology (Wuxi) Co., Ltd. for the best in supplies: Demo Led Module.
Demo Photoelectric Technology (Wuxi) Co., Ltd. has an excellent staffs who will guide you with their best ideas by keeping in constant touch with your company and informing about the market trends.
One, the whole board of the led unit board does not LED Light module up
The whole board of the led unit board is not high. At this time, check whether the power supply of the led unit board is connected to the signal line for any problems, and then check the test card of the led unit board. The red light of the test card added to the led unit board flashes, it means that the test card is normal, otherwise it means the contact is poor. Then confirm that the 74HC245 of the led unit board is not short-circuited.
Two, the screen overlap of the led display
At this time, check the A, B, C, D signal input ports of the led unit board, whether there is a disconnection or short circuit between the test port and the 245, and make sure that the A, B, C, D signal output of the led unit board is It's not normal.
Three, all or part of the light is off
If the led display is all on or part of it is not on, it is necessary to check whether the circuit between led unit boards 138 to 4953 is in poor contact or short circuit.
4. When working, one or more points are not lit
First, you need to find the control pin corresponding to the led unit board, and replace the led unit board or indicator light.
5. When scanning, several or more lights up
Check whether the signals A, B, C, and D of the led unit board are short-circuited, and whether the 4953 output terminal is in poor contact.
VI. One or more columns do not LED Light module up during work
Find the points that control the corresponding pin column on the led unit board, and then measure these points to check whether the output terminal of the driver IC (74HC595/TB62726) of the led unit board is connected properly.
Seven, display lack of color
When the display lacks color, it is necessary to check the data terminal of the color of the led unit board to determine whether the data signal connection data of the color output terminal of the led unit board is normal.
Eight, display confusion
Display disorder is mainly the problem of the output terminal. It is necessary to check whether the latch terminal of the output terminal is connected successfully on the led unit board, or whether the signal at the output terminal of the led unit board is short-circuited.
Nowadays, the adoption of About Us in led light engine industry is quite common.
Visit Demo Photoelectric Technology (Wuxi) Co., Ltd. for the best in supplies: Demo Led Module.
Demo Photoelectric Technology (Wuxi) Co., Ltd. has an excellent staffs who will guide you with their best ideas by keeping in constant touch with your company and informing about the market trends.
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