Apple Cinema Display Shuts Down under MBP Battery Power

Just had the logic board replaced on my early-2008 MBP. Got home, connected to my Apple Cinema display, everything's fine. However, when I disconnect the laptop power source, the cinema display goes dark. I can click the mouse, my password prompt comes up, I enter the password and the display comes back for a few seconds, then goes dark again. If I wait more than a few seconds the laptop goes into sleep mode. Only when I reconnect the power does it come back to life. Not sure what the issue is, I checked all the battery and power settings, I don't have anything set to automatically go into sleep mode. Also went to the display panel, clicked "Detect". Still having the problem. Someone once before suggested checking the option to "Mirror" the displays, but I don't even see that option in the display panel any longer.
Any suggestions?

FWIW this has never worked with an external display while on battery power alone either in Clamshell mode or Mirroring/Extended Desktop - I thought the MagSafe was a requirement did it works without it before the replacement ??

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