I have an old 16 inch Apple monitor. The brightness is starting to dull and I currently have the brightness knob up full. I have taken the back off the unit and adjusted the RGB knobs/sharpness knobs/contrast knobs but this didn't helpmuch. Is there some way of possible increasing the voltage to the tube to increase the brightness ? The screen is also slightly blurry which I would like to fix. Again this improved with alternations to the trim-pots but is there a trick to this ?