One day it worked fine, next day the screen went black 20-30 seconds after turning it on. The monitor light stays blue, but no picture. If turned off for a while, the same process repeats itself. The less time between shutting it off and turning it on results in less time before going black. So my guess is that it's heat related. The pictures of the area around U501 and U502 seem to indicate over heating in that area, which can also be seen on the other side of the board.
The U501 and U502 have the following information on them :
NIKOS
P2504 BDG
Qn19K0204
...

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Hello, found this site looking for causes for monitor going black.