depending on your type of monitor there will be either an adjustment board or some pots on the chassis to adjust,they are usually clearly marked(use a torch),if you have flyback lines turn down your screen volts on the lopti.There is one other thing that can cause a poor picture and thats a low 5volts on the power supply,remember depending on your experience you have to be very careful with your hands in the back of a live monitor,i have been working in the amusement industry for 20 years and i still get the odd belt,good luck.