If you cannot adjust the image to fix the problem, swap the video cable for a shorter video cable to see whether the problem is related to the video signal strength. If the picture is better when the cable is replaced, use the shorter cable. If the image quality problem persists, the monitor might be defective.
Use this guide to replace the display cable in your Dell Inspiron 15 5584 laptop. The LCD display cable is a piece of hardware that connects the screen to the motherboard of the device. A broken display cable can cause poor connection between the screen and the motherboard, resulting in distortion, blank areas, or unexpected bands of discoloration.
Connect any peripherals to the display device. Connect the display device and computer to AC power. Turn on the computer and the display device. If you are not using an HP monitor, select the correct video source on the monitor, projector, or TV. For example, if you are using an HDMI port, set the source to HDMI.
Input lag can be measured using different points on the screen. While a 60 Hz monitor may theoretically take 1/60 second to render a complete frame, parts of the display may change faster than others.
This problem may occur if you are using the wrong graphics driver or its out of date. So you should update your graphics driver to see if it fixes your problem. If you don’t have the time, patience or skills to update the driver manually, you can do it automatically with Driver Easy. How do you tell if laptop LCD cable is bad?
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laptop lcd cable problems