Measuring the voltage of the switch power + B is about 110 v, the basic normal, and observation kinescope filament is not bright, line shows the output level does not work, suspect a protection circuit action. Voltage measuring IC601 {42} feet to 1 v, confirmed that the protection circuit starts forcing IC601 vibration. Check the pipe, line output transformer and deflection coil no short circuit phenomenon. Welding open R519 end of commissioning and saw that the line output level does not work, measuring IC601 {42} feet voltage is 8 v, voltage is 2 v {41} feet all normal, explain IC601 existing line excitation pulse output. Test manager b without negative bias, measuring line drive pipe Q502b is 0.3 V, the voltage is 78 V, c lower than normal 10 V, at this time to determine the fault line drive circuit. In Q502 after commissioning is invalid, touch line drive transformer T502, found to have abnormal heating phenomenon, remove the test, only about 70 Ω its primary resistance and the normal resistance value should be 150 Ω, proving T502 local short circuit. Because without the same model to replace, so we have to break the original T502 rewind, according to the original around to, primary use 0.1 mm enameled wire around 1200 turn, secondary rewind with the original line, number of turns for 33 of turns. Varnished after air return circuit of commissioning, images appear, measuring Q502c voltage is 87 v normal, restore R519 welding feet to commissioning, troubleshooting.uvuservice manual download site