行输出管(简称“行管”),是彩电中的重要器件之一。“行管”损坏,在彩电故障中所占的比例较高。其损坏有两种可能:一是击穿短路;二是开路。两种结果都会引起无光栅、无图像、甚至无伴音的所谓“三无”现象。实际中又以“行管”因过流、过压击穿的几率据多。追究“行管”损坏的原因,大多都是输入电路(行振荡、行激励)和行管 Line output tube (referred to as “line management”), is one of the important components in color TV. “Line control” damage, a higher proportion of color TV failure. There are two possible damage: First, breakdown short circuit; the second is open. Both results give rise to a so-called “three-no” phenomenon with no raster, no picture, or even no sound. In fact, “governs” because of over-current, the probability of over-voltage breakdown is more. Investigate the “unmanaged” cause of the damage, mostly the input circuit (line oscillation, line incentives) and line management