A high-quality and timely check of the backlight lamps in LCD panels can significantly reduce the time spent on repairs, since the failure or serviceability of the lamps is detected even before the panel is disassembled. In order to carry out a quick and reliable diagnosis, use a device specially designed for this, and we will tell you how it works.
Instructions
Step 1
In order to check the backlight lamps on the LCD panels, use a specially designed device. This device allows you to quickly check the backlight lamps without requiring them to be removed and disconnecting the loops from the inverter.
Step 2
Before using the device, be sure to turn off the device being tested. Using this device, you get a complete and correct diagnosis of the operability of all lamps, and this allows you to identify faulty lamps even before disassembling the panel, or to understand that all lamps are working, and the converter needs to be replaced. This method makes the repair time much shorter and also reduces the risk of possible damage during diagnostics.
Step 3
In order to carry out competent diagnostics using such a device, follow the following instructions.
Step 4
Before starting diagnostics, disconnect the tested device from the network. Insert the AC adapter into the desired socket and plug it into a power outlet. The instrument will be in standby mode with two LEDs on.
Step 5
Determine the position of the board in the device under test, as well as the cables that connect the inverter to the backlight lamps. Connect the ground wire to the chassis of the UUT. This point is very important to the verification process, so make sure that there is no chance of accidental disconnection of the wire.
Step 6
Now take the device in your hands and touch it with the tip of the lamp connection point, while the tip is firmly fixed, do not allow it to move, as high voltage can damage the inverter. Next, press the large button (the one closest to the tip).
Step 7
Please note that the indicator light should go out at this time and not light up all the time the button is pressed. After literally a second, you can start reading the readings: - one LED went out for the time the button was pressed, and then the other turned on - the lamp is working
- one LED did not go out while the button was pressed, and the other did not turn on - the lamp is faulty.
Step 8
After the test, release the button, the LEDs should light up, as the device will be in standby mode.
