The display of my IBM laptop goes off after 5 minutes. However, it will display images on external LCD.?

This could be an issue with the screen inverter. When the display goes off, either bring the laptop to a very bright room, or grab a flash light. Take a REALLY good look at the screen. Can you still see the images that were there before the screen "turned off" but just really dark, as if the light went out? If so, then it is an issue with your inverter. The Inverter is the device that inverts the DC power from the battery or power adapter, to AC power that the Cold Cathode Tube bulb that illuminates the screen needs.

If no amount of holding a flashlight to the screen, or bringing the laptop quickly to a well lit room reveals that your screen still works but only went dark... then it might indeed be a motherboard issue or a connection issue. So, at that point, you would either check the cable that connects the motherboard to the screen for any breaks... or you would replace the motherboard.

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