Screen Goes off above certain angle

The screen of my MacBook 2GHz Intel Core 2 Duo goes black when I raise it above about 70º . It re-illuminates when lowered and finally goes off as normal as it nears the closed position. It is difficult to use at anything below 90º. The backlight is being switched off it appears but data is still being sent to the screen as it can be seen vaguely. Does anyone know what mechanism is used to switch the screen off and if so where it is situated and whether it is easy to fix? I do not think it is a software fault...

I'd be surprised if the magnetic latch was responsible for switching off the backlight otherwise would it not be possible to switch the screen off by putting something magnetic close to it which would be annoying? The magnets are located at the top corners of the screen and the corners of the keyboard hand rest areas. I thought it might be a loose connection to the inverter board but wouldn't expect it to remake contact once broken.

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