Unplug the screen backlight cable from the right side of the inverter.ġ. Now let’s test it with a known good backlight lamp.ġ. Apparently, it’s either bad inverter or failed backlight lamp. So far we know the inverter is getting power from the motherboard, but the screen still has no light. Proceed on your own risk! Not sure? Don’t do that! WARNING! If you accidentally short something on the inverter while testing, you can damage it. I got about 19.4V DC on that side of the board, so it’s getting power from the motherboard. In my case I connected the “+” lead of the voltmeter to the pin 1 and the “-” lead to the ground trace around the screw hole. To make sure that inverter gets power from the motherboard (via the LCD cable), you can test it with a voltmeter. The right side connects to the backlight lamp which is mounted inside the screen. The inverter has connectors on both ends. The left side connects to the LCD cable. In most cases you can access it after you remove the display bezel. Usually the inverter is mounted inside the display panel below the screen. Why? Because the same backlight lamp will work with many different inverters as long as they have matching connectors. In most cases I go with the second method – using my test backlight lamp. There is only one reliable way to test the inverter – replacing it with another one and see if the screen lights up after that.Īlternatively, you can connect a new backlight lamp and see if your presumably bad inverter lights it up.
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