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雪莲54cm(21英寸)电视机(TA9698,7680两片老式机心),出现“三无”故障前,图像行幅大、光栅亮度大、颜色、伴音正常,后来“三无”。打开机壳,检查保险(3.15 A)已熔断、发黑,系严重短路,更换一只新的保险,打开电源开关,拔掉消磁线圈,用万用表 R×1档测量电源插头两端电阻,电阻为零。检查系电源滤波电容0.1μF短路,将其更换,再仔细检查电路中的其他元件,没有查出不良器件,想到
Snow lotus 54cm (21 inches) TV (TA9698,7680 two old machine heart), appeared “three no ” before the failure, the image line width, grating brightness, color, sound normal, . Open the case, check the fuse (3.15 A) has blown, black, serious short circuit, replace a new insurance, turn on the power switch, unplug the degaussing coil, with a multimeter R × 1 measure the power plug at both ends of the resistance, resistance Zero. Check the Department of power supply filter capacitor 0.1μF short circuit, replace it, and then carefully check the other components in the circuit, did not detect the bad devices, think