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例一 一台牡丹牌TC-483型彩电 故障现象:使用几年后出现一种很特殊的软故障,开机后声、光、图均正常。若中途不关机,一直正常收看;但中途一旦关机后再开机,就会出现无光无声现象。非得等一段时间(最少20分钟后)或次日再开机,才能恢复正常工作。如再关机,故障依旧。 分析:由本机电路原理看出,伴音电路的工作电压,直接取自开关电源,而与行输出变压器无关。由此可知,
Example one Peony card TC-483 color TV Fault phenomenon: the use of a few years after the emergence of a very special soft fault, boot sound, light, the picture is normal. If you do not shut down halfway, has been normal watch; but once the mid-turn off and then boot, there will be no light and silence. Do not wait for a period of time (at least 20 minutes later) or reboot the next day to resume normal work. If the shutdown, the fault still. Analysis: The principle of the circuit seen by the circuit, the working voltage of the audio circuit, directly from the switching power supply, and the line output transformer has nothing to do. Thus,