How to test screen inverter. In this post I explain how I test the inverter board in a laptop. Oban Star Racers Game. The inverter failure is very similar to the backlight lamp failure. In both cases the screen gets very dark and the image becomes very faint, barely visible under a bright light. There is only one reliable way to test the inverter replacing it with another one and see if the screen lights up after that. Search for the QuickSpecs you are looking for online in Literature server or via Google Custom Search. You can also download QucikSpecs locally on your pc by using. View and Download HP 250 G4 service manual online. G4 Laptop pdf manual download. In this post I explain how I test the inverter board in a laptop. The inverter failure is very similar. My Toshiba laptop suddenly shuts down by itself without any warning. Sometimes it works fine for hours, sometimes it shuts. Download the latest drivers for your HP ProBook 4431s to keep your Computer uptodate. РАБОТНО ВРЕМЕ на магазина офиса и склада ПОНЕДЕЛНИК, ВТОРНИК и СРЯДА от 0900 до 1800 tелефон. Hp Compaq Nx9010 Wifi Drivers' title='Hp Compaq Nx9010 Wifi Drivers' />Alternatively, you can connect a new backlight lamp and see if your presumably bad inverter lights it up. In most cases I go with the second method using my test backlight lamp. Why Because the same backlight lamp will work with many different inverters as long as they have matching connectors. Usually the inverter is mounted inside the display panel below the screen. Car Racing Games Blogspot. In most cases you can access it after you remove the display bezel. The inverter has connectors on both ends. The left side connects to the LCD cable. The right side connects to the backlight lamp which is mounted inside the screen. Check out this display diagram. To make sure that inverter gets power from the motherboard via the LCD cable, you can test it with a voltmeter. 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. I got about 1. 9. V DC on that side of the board, so its getting power from the motherboard. WARNING If you accidentally short something on the inverter while testing, you can damage it. Proceed on your own risk Not sure Dont do that So far we know the inverter is getting power from the motherboard, but the screen still has no light. Apparently, its either bad inverter or failed backlight lamp. Now lets test it with a known good backlight lamp. Unplug the screen backlight cable from the right side of the inverter. Connect a known good backlight lamp. Hp Compaq Nx9010 Wifi Drivers' title='Hp Compaq Nx9010 Wifi Drivers' />Turn on the laptop. If the test backlight turns on, the lamp inside the screen is bad. In this case youll have to replace the screen. Also, you can replace the backligth lamp which is not easy and not recommended. If the test backlight doesnt turn on, most likely we have inverter failure. Replace it and test the laptop again. There are two different types of backlight connector, you can see them on the picture below. The top one big is not as common as the bottom one small. I mostly use lamps with a small connector. IMPORTANT When you buy a new lamp for test, make sure the connector fits your inverter. On the following picture you see how Im testing the laptop with a new lamp. Related articles Troubleshooting backlight failure. Screen shows strange colors. Troubleshooting video problems.