[dremsburg]

So i recently had my iBook's logic board replaced, and ever since I've gotten it back, the screen will randomly turn off, as if it were sleeping. But everything else is still on, I can hear it running, its only the screen that is dead. The only way for me to get the screen back on is to restart. This has happened about 4-5 times in the past several weeks

Suggestions?

[AKcrab]

I would guess your inverter and/or reed switch is going bad. The best test is with external video.

[B Gallagher]

Ditto AKcrab. Test this with any external monitor. If it is what I think it is, try taking the brightness all the way down, then back up, and repeat. If you're having this sort of issue, changing the brightness usually sets it off.

If it's not the inverter board or the reed, it'll be the logic board itself which will be replaced. Regardless of whether it's still under warranty or not, you should have some sort of service warranty on the logic board. How long ago was it replaced?