Back light remains on when display turns off when on battery

Hi,
Sorry for the long subject line, but it basically sums up the issue.
I'm using Windows 7 64-bit on a T61 with nVidia Quadro NVS 140M discrete graphics. I installed the latest Windows 7 drivers from Lenovo, including the driver for the video card. This was a completely fresh install of Windows 7.
Everything seems to be running great, with the exception of the LCD back light when I'm on battery. I have the power settings set to "turn off display" after five minutes. When I idle for five minutes the display indeed goes "black", but I can still see it "lit".
With the back light still active I'm having to close my lid to ensure my battery lasts a decent amount of time.
Has anyone else experienced this on Windows 7 and better yet know how to fix this?
Thanks in advance.

Could be any number of things.  Something failed on the monitor (power supply perphas).  Maybe the cable fatigued and a wire broke inside.  Maybe your video card has failed.
In other words, too many variables.  You need to eliminate them as best yo can.  Try the monitor on a different computer.  Try a different cable and/or check cable connections.   Try another monitor on your computer.
Try a smc reset but it probably won't change anything.

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