How to use multimeter to test led display's malfunction & fault
As the electronic equipment, sometimes the fault happen on led displays. The fault could be the control PC side of hardware or software, also could be the screen side such as the whole led screen off, flakes on the led screen, black block, or the possible flicker. When a fault reported to us from the clients, usually we would require one picture to show what's the problem, and we will bring out the suggest and solution to our clients step by step to solve it. But sometimes, the clients with higher tech background would inspect and solve the problem on their on. And the multimeter is very frequently used.
And usually there are 4 ways to use the multimeter:
1. Turn the multimeter's gear shifting to the direct voltage. Test the line-to-earth voltage of the possible fault point, and compare it with the well working point, to test the fault.
2. Turn the multimeter's gear shifting to the short circuit. This test should be executed when the electricity off, to avoid the possible harm to the multimeter. When there is the short circuit happen, the multimeter will alert. The short circuit is one of the most frequently happen problem, sometimes it would be inspected out by watching the IC feet, or the PINS.
3. Test the voltage drop. All the driving ic of the led displays are composed essentially with many tiny units, so when there's the current flow, the voltage drop would exist. So with testing the voltage drop of each IC feet, the fault point would be inspected out.
4. Test the fault with the multimeter's resistor gear shifting, and test the resistance value of line-to-earth. With test the well working point and the possible fault point, we would find out where the problem is.
This may sound complicated to some clients, but there's no necessary to worry about that because all those are to the very tech-skilled person. As the end user, when face any problem, we'd suggest you where the problem is and swap the fault modules, psu etc with our spare parts. And after that, our client would post back the fault components to us for the repair.
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| LED displays aging |
And usually there are 4 ways to use the multimeter:
1. Turn the multimeter's gear shifting to the direct voltage. Test the line-to-earth voltage of the possible fault point, and compare it with the well working point, to test the fault.
2. Turn the multimeter's gear shifting to the short circuit. This test should be executed when the electricity off, to avoid the possible harm to the multimeter. When there is the short circuit happen, the multimeter will alert. The short circuit is one of the most frequently happen problem, sometimes it would be inspected out by watching the IC feet, or the PINS.
3. Test the voltage drop. All the driving ic of the led displays are composed essentially with many tiny units, so when there's the current flow, the voltage drop would exist. So with testing the voltage drop of each IC feet, the fault point would be inspected out.
4. Test the fault with the multimeter's resistor gear shifting, and test the resistance value of line-to-earth. With test the well working point and the possible fault point, we would find out where the problem is.
This may sound complicated to some clients, but there's no necessary to worry about that because all those are to the very tech-skilled person. As the end user, when face any problem, we'd suggest you where the problem is and swap the fault modules, psu etc with our spare parts. And after that, our client would post back the fault components to us for the repair.
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