This machine of switching power supply work in horizontal frequency, the free vibration frequency of 12 ~ 14 KHZ, synchronized by line flyback pulse trigger. When lines did not trigger pulse arrival or flyback pulse amplitude is insufficient, the power supply will work according to the free oscillation. At this time to the human ear will hear 12 ~ 14 KHZ "squeak" sound, images will also see cosette vertical strip disturbance in horizontal direction. 3ACservice manual download site
(1) online measuring R817 resistance for 39 Ω, normal. 3ACservice manual download site
(2) boot with 0.47 u F capacitance and on C813, parallel fault elimination, after C813 open. Application of nominal resistance capacitance voltage 200 v.3ACservice manual download site