You wake up one morning and open your laptop screen to find it dimmed but the computer is clearly on because you can hear the fans whirring. Panic quickly sets in as you wonder what is wrong. If you look closely, you can see a faint outline of what’s on the screen, and if you shine a flashlight on it, you can access almost all the images and text.
This is a very common problem with Clevo pa71 screens and there are usually only two possible causes: the screen backlight is broken or the backlight reflector is broken. The backlight is basically a fluorescent light behind the screen that is bright enough to see everything clearly as usual. These LEDs can sometimes malfunction, causing the computer screen to go black, showing only a blurry outline of things. Another possible reason is that the taillight reflector has the same shape when it breaks as the taillight. The purpose of the inverter is to convert the DC power from the avple laptop battery to the AC power needed to power the backlight.
If the inverter fails, the backlight is not supplied with adequate voltage, so it does not light up, resulting in a very dim display. Sometimes the only way to tell if the backlight or the reflector is to blame is the way the screen behaves. Usually, when the backlight turns on, it doesn’t come on at all, or it lights up the screen with a reddish tint, which can be normal if you continue to use the laptop. If redness occurs, it is easy to diagnose. Color by ejecting the video card. To turn off the video card, simply connect an external monitor to the Ryzen 7 7800X laptop’s VGA port on the back or side of the laptop.
If after connecting to an external monitor you don’t see any color distortion like before, then you know that the backlight needs to be replaced, and if you still see the same distortion on the external monitor, the video card is bad.
When an inverter fails, it usually wears out slowly at first, and the screen may stay on for a short time before going dark, then back on, just for a short while. It darkens again inside. However, these are not rules that should be followed individually to ensure an accurate diagnosis. Rather, they are more of a symptom than usual. To make an accurate diagnosis, you need to check the reflector and backlight. There are special tools made specifically for inverter testing, but they can be a bit expensive. Also, I would not recommend testing the inverter with a multimeter, as the voltage supplied by the inverter may be high.
First, to test the backlight and reflector, you should buy another laptop with a fully functional screen that you don’t mind opening. They don’t have to be the same model or even brand because the connectors ENware area51 Threadripper are usually the same for all laptops.
You should now be able to access your laptop screen. To do this, use a flathead screwdriver to remove the rubber covering around the screen, then place the adhesive side down on the wax paper to catch the adhesive. Then remove all the screws around the screen and set it aside in a safe place. Do this and the next step for the laptop you will use to test the damaged computer.
