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C46-1型、18英寸彩电(后加装遥控装置),故障现象为三无。 根据故障现象,先检查开关电源,发现保险丝熔断。用万用表1K挡,黑表棒接开关C极,红棒接地,测得阻值很大(正常时应为10K左右),且无充放电现象。拆下滤波电容,发现其内部开路,再检查开关管,其c—e极间开路,继续检查CP901、脉宽调制管Q903(2SC2060),发
C46-1 type, 18-inch color TV (after the installation of remote control device), the failure phenomenon of three no. According to the fault phenomenon, first check the switching power supply and found the fuse blown. 1K block with a multimeter, black bar connected to the switch C pole, red rods grounded, measured resistance is great (normal should be about 10K), and no charge and discharge phenomenon. Remove the filter capacitor and found its internal open circuit, and then check the switch, the c-e pole between the open circuit, continue to check CP901, pulse width modulation tube Q903 (2SC2060), hair