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一则长虹B2116彩电屡烧“行管”为晶振(500 kHz)惹的祸邵观杰故障现象:“三无”(即无图、无声、无光栅)检修:从一般维修经验来看,首先检查行输出电路,发现“行管”击穿,在路测量各部分怀疑元件均无损坏,更换新“行管”,开机不到一分钟只听“扑啦”一声又损坏,且屏幕根本就没亮,由此怀疑行输出变压器和逆程电容有问题,又更换新行输出变压器和逆程电容后,吸取上次教训,开机前在行输出管(V432)集电极与地之间接好万用表,以便观测电压情况,在行推动管
A CHANGHONG B2116 color TV repeatedly burned “in charge” for the crystal (500 kHz) blame Shao Jie Jie Symptom: “three no” (that is, no picture, no grating) Maintenance: From the general maintenance experience point of view, first check the line Output circuit and found that “in charge of” breakdown, measuring all parts of the road suspected components are not damaged, replace the new “governed” boot less than a minute only listen to “flutter” and then damaged, and the screen simply did not light , Thus doubting the line output transformer and the reverse capacitor problems, but also replace the new line output transformer and the reverse capacitor, learn the last lesson, before starting the line output tube (V432) between the collector and the ground between a good multimeter, so that Observing the voltage situation, pushing the tube in the line