Open the back cover and observe F801 insurance tube has black fusing, switching power supply are serious fault. Remove the degaussing coil, measuring the rectifier input and output resistance and the resistance between each side in the rectifier are normal, to illustrate the three part no obvious fault circuit. Change a F801 insurance tube, boot no longer fusing, monitoring + 113 v output voltage is normal. The further trial, figure sound is normal, just image has a magnetic phenomenon. Shutdown restore degaussing coil, still so. To turn it off in a few minutes and then touch degaussing resistance, no temperature rise, apparently degaussing circuit has a problem. Resistance welding under the degaussing D809 and infinite resistance, shaking D809, inside the debris. So native F801 fusing system D809 pieces of internal short-circuit caused by the two pins. After replacement, figure sound back to normal.UcWservice manual download site