As for the ignition coil is damaged, replace the normal. After I came into contact with many similar fault samsung monitors, including model 550 b, 550 s, almost without exception are high-voltage silicon stack was breakdown in the ignition coil. When faced with such a failure, remove the pressure cap, high pressure cap is measured with a multimeter R x 1 k block of positive and negative to the resistance of judgment. At this time. If no suitable ignition coil change, also can use a series of 20 kv high-voltage silicon column on the high tension line emergency use.2sYservice manual download site