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(1)开关电源工作后又停止开机的瞬间有电视机工作的声音,然后停止工作,整机“三无”。副电源取自主电源的电视机,开机的瞬间指示灯亮一下然后熄灭;具有独立副电源的电视机,指示灯发光。(2)输出电压建立后又消失开机的瞬间开关电源次级均有输出电压,然后降到0V。由于万用表的惰性,测量时,指针只是向右摆动一下后,又回到最左端0V。
(1) switching power supply and then stop working the moment there is a TV work sound, and then stop working, machine “three no ”. Secondary power taken from the main power of the TV, the moment the boot light on and off; TV with independent secondary power, the light indicator. (2) the output voltage disappears after the establishment of the moment the power switch have a secondary output voltage, and then dropped to 0V. Due to the inertia of the multimeter, when measuring, the pointer just swings right and returns to the leftmost 0V.