Darkness problems with my Technika x22/14c-gb-tcd-uk?

Hey, I'm having a problem with my TV. It's a Technika x22/14c-gb-tcd-uk When I switch it on, the picture will come up fine, and normal, but then after a period of around 5 seconds, the screen will suddenly turn black. However, the picture doesn't actually go off, it just turns extremely dark. If I... show more Hey, I'm having a problem with my TV. It's a Technika x22/14c-gb-tcd-uk
When I switch it on, the picture will come up fine, and normal, but then after a period of around 5 seconds, the screen will suddenly turn black.

However, the picture doesn't actually go off, it just turns extremely dark. If I angle it right, and with the right light, I can barely see the picture, so it's not turning off. The sound is completely unaltered.

I've tried the wires, it doesn't seem like any of them are loose.
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