A customer of mine attempted to replace a damaged (LED backlit) display panel on a late model HP Pavilion g6-1d08x laptop. He subsequently brought it to me, and, seeing that he had mangled the connectors of both the display cable and screen, I ordered replacements for both. When I put it back together, the backlight would not work. I checked with a flashlight; the panel gets a good picture, but the backlight doesn't operate. It makes no difference whether I boot normally from the hard drive (Windows 7) or something else; the backlight won't even come on for the power-on self-test. It also does not respond to the keyboard hotkeys for turning the backlight up and down, whether or not Windows is running. If I plug the laptop into an external monitor, the picture is properly displayed on the external monitor.
The problem is, I have no idea how to determine whether the problem is the cable, the panel, the display connector on the motherboard, the lid switch, the BIOS or something else. I've tried two cables now (I thought the first was defective). Neither the old panel nor the new one will light up, although both display a picture that can be seen with a flashlight (the damaged one shows mostly lines and splotches, as you'd expect from a damaged LCD panel). I find it hard to believe that I have two panels with defective backlights or two bad cables. I don't know where the lid switch is, and the HP repair manual doesn't mention it. I don't have a supply of spare parts to swap in and out, and I don't know how to test the output of the motherboard display connector.
Can anyone provide some guidance? Many thanks!
The problem is, I have no idea how to determine whether the problem is the cable, the panel, the display connector on the motherboard, the lid switch, the BIOS or something else. I've tried two cables now (I thought the first was defective). Neither the old panel nor the new one will light up, although both display a picture that can be seen with a flashlight (the damaged one shows mostly lines and splotches, as you'd expect from a damaged LCD panel). I find it hard to believe that I have two panels with defective backlights or two bad cables. I don't know where the lid switch is, and the HP repair manual doesn't mention it. I don't have a supply of spare parts to swap in and out, and I don't know how to test the output of the motherboard display connector.
Can anyone provide some guidance? Many thanks!