Solved! x240 boots with logo, but extremely dark, looks like a black screen.

[esmail]

I recently replaced the LCD cable on my x240, and then the screen.

The new LCD cable worked, but my old LCD cracked during the reinstall process, losing the left half of the screen, so I ordered a replacement using the right FRU (or whatever the part acronym Lenovo uses). Now when I try to boot the system, the logo shows up, but it's barely visible on the othewise dark screen. Keyboards/leds etc all work.

It definitely boots with logo, but extremely dark, looks like a black screen. I.e., the logo isn't bright like usual. Also, I can't tell what happens afterwards, the screen goes blank, but I'm not sure it's going on to Windows or what happens. It's not rebooting on its own though. The system definitely stays on until I power it off (and I can see the screen power off too).

This is happening with both LCD screens. I also tried the old LCD cable - exactly the same.

Any suggestions?

Thanks
PS: Any suggestions how I can disable the internal battery? Before I would do this with the BIOS, but now I can't get to that screen :-/

 

[helpstar]

Check with an external monitor or TV

might be a backlight inverter problem or the lid sensor