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一台长虹 CK53A 遥控彩电,正常收看中,因电源电压升高(变成线电压380V)而造成三无。拆开检查,保险 F901熔断,测量电源开关管Q801(2SD850Q)及行管 Q551(2SD951)均正常,检查电源周围元件均无明显异常,更换保险后,通电再次熔断,说明有短路现象存在。切断 C807(100pF400V)正极以后,换上保险通电,保险还是熔断,测量两个半桥
A Changhong CK53A remote color TV, the normal watch, due to the power supply voltage (into a line voltage 380V) caused by three no. Open the inspection, insurance F901 fuse, measure the power switch Q801 (2SD850Q) and the line tube Q551 (2SD951) are normal, check the power supply components were no obvious anomalies, replacement insurance, power fuse again, indicating a short circuit exists. Cut off C807 (100pF400V) positive, put on the insurance power, insurance or blown, measuring two half-bridge