The level of a bright line is disorder caused by field scanning circuit work. Using oscilloscope to observe AN2510S 3 feet sawtooth voltage waveform output, if the output is normal, should check whether the deflection coil is open; Without output, using the oscilloscope observation AN2510S 7 feet for sawtooth wave signal output. If the 7 feet without output signal, the fault is present oscillation circuit. In this case, can use a multimeter to check AN2510S 1 ~ 10 feet of voltage is normal, if the voltage is not normal, check out certain parts need to change AN2510S.nFZservice manual download site