First of all, did this just begin? Is it a new monitor you just acquired or had for some time?
Off hand it sounds like the starter board, but could be a back light issue. Aside from that,there could be other issues, like the monitor cable, graphics problem on PC, etc... hard to say at this point. I have a monitor that only works with standard VGA drivers, not with ATI or Nvidia cards and will go black in the same manner.
Did you try the monitor on another computer? Does the same thing happen? Have you tried booting into (safe mode) and see if it happens?
A bit of information, they don't typically come apart that easily and unless you are very careful, it's easy to damage something that may not be damaged currently. Likely it has some covered up screws or the outer cover is clipped together, either way, it can be a hassle and personally, I would wait until you try other troubleshooting steps.
When I turn this monitor on its OK for about one minute then the screen goes black. If I turn it off again and turn it back on the same thing happens. I think it may be the bulb or some sort of circuit breaker but I have no tech info or schematic and I can't figure out how to get the housing apart-no screws or conector visible. Any help would be appreciated