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长虹彩电无图无声,开关电源出现叫声,测开关电源S_1端111V电压仅有十几伏。断开行电源电路,S_1端111V电压恢复正常。测量行输出管未损坏,其他元件也完好。当测量行输出变压器时,发现⑤～⑥～⑧脚与①～④～⑨脚击穿短路。因①脚为接地端,故而造成S_1端111V电压大幅度下降至十几伏。⑤～⑥脚为111V行直流回路,①～⑨脚及①～④脚均为低压绕组。据此,只要将①～④～⑨脚全部从电路上断开,然后通电试验,如高压正常,就可在行输出磁芯上用穿线
Changhong TV without picture silent, switch power appears crying, measuring switch power S_1 111V voltage only a dozen volts. Disconnect the power supply circuit, S_1 111V voltage back to normal. Measuring line output tube is not damaged, other components are intact. When measuring the line output transformer, found ⑤ ~ ⑥ ~ ⑧ feet and ① ~ ④ ~ ⑨ pin breakdown short-circuit. Due to ① feet for the ground, which led to S_1 111V voltage dropped to more than ten volts. ⑤ ~ ⑥ feet 111V line DC circuit, ① ~ ⑨ feet and ① ~ ④ feet are low voltage winding. Accordingly, as long as the ① ~ ④ ~ ⑨ feet all disconnected from the circuit, and then energized test, such as high-pressure normal, can be used in the line output core threading