MBP screen goes dark - only when plugged in

Hi, my four year old MBP 15" hasn't given me any trouble until now.
Recently I have only been able to use the mac on battery power as the screen goes almost completely dark once I plug it in. I have changed the settings in system preferences within power and displays, however this hasn't solved the problem.
Prior to taking it to a repair shop, do you have any suggestions what is triggering the light to go dark ? Thanks in advance.

Hi f, and welcome to Apple Discussions.
It sounds like it could be a bad inverter board, but I don't know if that would cause it to happen only while using the power adapter. Depending on your exact model, it could be:
http://www.ifixit.com/MacBook-Parts/MacBook-Pro-15-Inch-Models-A1150-A1211-Displ ay-Inverter/IF185-090

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It sounds like it could be a bad inverter board, but I don't know if that would cause it to happen only while using the power adapter. Depending on your exact model, it could be:
http://www.ifixit.com/MacBook-Parts/MacBook-Pro-15-Inch-Models-A1150-A1211-Displ ay-Inverter/IF185-090

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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
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Please don’t post other kinds of diagnostic report.
I know the report is long, maybe several hundred lines. Please post all of it anyway.

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MBP screen goes dark - only when plugged in

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