Look here! Dani.

http://www.hutzelman.com/home/hardware/mods/monitor/


There is a modification used on some Sony monitors, I have done it
three times, with no problems. If your screen is too dark, then maybe
your G2 is too low. try the "R459 fix"!
Not sure if your model is the same. It's a 4 - 10 meg I think on the
CRT board. You have to play around with the value, as the level of
overall brightness varies. solder a 1 Megohm resistor piggyback on top
of the one there sometimes works.