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例1 机型:如意SGC—5102彩电故障现象:光栅满幅回扫亮线。分析检修:凋加速极电位器无法消除,查C_(320)视放180V电源滤波电容正常,查场消隐脉冲电路R_(266)、R_(267)、D_(209),结果R_(266)开路,用2.2kΩ电阻换上,回扫亮线消失,电视机恢复正常。例2 机型:如意SGC—5102彩电故障现象:开机后“三无”,指示灯不亮,有“吱吱”声。分析检修:查主电源+B:110V正常,行输出管Q_(305)集电极为110V,但测集极无电压,测T_(301)次级有电压,原因是电感L_(301)开路,更换后一切正常。
Example 1 model: wishful SGC-5102 color TV Fault phenomenon: full-scale grating flyback bright line. Analysis and maintenance: withered pole potentiometer can not be eliminated, check the C_ (320) as 180V power supply smoothing filter capacitor normal check field pedestal circuit R_ (266), R_ (267), D_ (209) Open circuit, put on 2.2kΩ resistor, flyback bright line disappears, the TV back to normal. Example 2 model: wishful SGC-5102 TV failure phenomenon: boot after the “three no” light is not bright, “creak” sound. Analysis and maintenance: check the main power + B: 110V normal, the output tube Q_ (305) collector is 110V, but the measured collector voltage, measured T_ (301) secondary voltage, the inductor L_ (301) After the replacement of all normal.