This failure was caused by line scan circuit or tube circuit work properly. Maintenance apart for electronics, like that when using a multimeter to check AN2510S 2 feet if there is a 5 v working voltage and 12 feet. When no voltage, should check whether there is a 5 v voltage switch power supply output, plug and socket is in good contact. Output voltage when normal use oscilloscope to check line pipe Q702 collector line flyback pulse signal output, should check whether Q701, Q702 damage, 20, 21 feet AN2510S external Q712 oscillation component, Q714, VR702, C710 whether virtual welding or open circuit. If Q702 collector output line flyback pulse signal voltage waveform is normal, the fault in the tube circuit. When application multimeter testing kinescope filament is damaged, open high voltage anode and accelerates the anode voltage and gate voltage is normal.wkWservice manual download site