I have a Dell Latitude D620 laptop. It was free. When I got it, it worked fine for three days. Then, whenever I turn it on, the screen is a garble of blue lines and shakiness. I hooked the computer up to an external monitor and it displays perfectly. So the LCD is bad, right?
I disconnected the LCD from the D620 and installed it on a Latitude 120L. The 120 uses identical connectors on a different style of ribbon. On the 120L, the same garbled blue lined LCD displayed crystal clear.
So, I have replaced the inverter chip/board, I have replaced the LCD ribbon cable, and I have pulled out most of my hair. This laptop has the notorious nVidia chip, but supposedly, if an external monitor is okay, the chip shouldn't be bad.
Can anyone offer me a suggestion on how to proceed?