故障为水平亮线 检查场块Ｎ４ＴＤＡ３６５４＃９脚供电电压２６Ｖ正常，用信号输入法 从Ｎ４第１脚住入信号，发现亮线能够展开，这说明场输出电路正常，测Ｎ２０１（ＯＭ８３６１）第４２脚为０Ｖ查供电电路电阻Ｒ４０１两端电压均０Ｖ，顺电路继续检查发现场１４０Ｖ电压经过Ｒ７８５后变为０Ｖ，测ＶＤ７１０３３Ｖ稳压管击穿，换后正常． |
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