| 【故障】现象：【sw三无】。7 C( o2 Y) J" L 【故障】检修，本文由家电维修杂志论坛http://www.jdwx.cn/收集资料：开机时行电路发出‘滴’声，+B电压在0-10V之间随‘滴’声变化。接假负载+B电压130V正常。检查行电路发现上阻尼二极管VD401短路，换后出现行幅不足、枕形失真的图象（如图3）。检查枕效电路电压，C410两端电压为50V，电压太高（正常24V）说明枕效电路没有工作。查枕效电路发现限路电阻R411（3.3/2W）开路，枕效管V403（9NQ20T）短路。用K2645代换9NQ20T枕效管后【故障】排除。   |
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