No video on compaq paresario x1012QV

I’m working a repair on a compaq presario x1012QV laptop and need some help. I replaced a bad motherboard and found that I have no lcd video. Subbed a known good video card ATI 9200 and still no lcd video. The lcd backlight works, but no video. Should I replace the video cable or the inverter? Has anyone run into this problem before on a presario?
Thanks
Lance