Just search for Lenovo B490 LCD cable part for results. There are others online who may suit you better. It is shown to give an idea of the cost of the part. Here is a link to just one supplier of the replacement part. Scroll to p.73 to view the necessary pre-requisite steps and then the procedure to remove the LCD cable from the display unit. Here is a link to the service manual for your laptop. If you cannot detect anything at all or even if you can detect an image, I suspect that it may be that the video cable is the problem (where it passes through, near the hinge, from the motherboard in the lower case to the LCD screen in the lid). It may be that only the LCD backlighting is missing and not the video signal. If it is there it will very faint, so you might have to try this in a darkened room to see if you can detect any images at all. Check with a torch, held at an angle close to the screen whether you can still detect an image at all when the display "turns off".
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