彩电行扫描电路损坏的故障率较高,而屡损行输管(以下简称行管)正是行部分损坏的主要故障。其实屡损行管不外乎过压击穿和过流击穿两种。开机瞬间即损坏行管多属过压击穿,开机少则几秒多则几天且伴有行管发烫现象属过流击穿。一、过压击穿过压击穿是造成行管瞬间损坏的直接原因,由于 Color TV line scanning circuit damage failure rate is high, and repeated damage to the line of transport (hereinafter referred to as the tube) is the line part of the damage to the main fault. In fact, repeated damage control nothing more than over-voltage breakdown and over-current breakdown of two. The boot moment that is damaged under the over-voltage over-voltage breakdown, as little as a few seconds to boot a few days and accompanied by pipe hot phenomenon is an overcurrent breakdown. First, the over-voltage breakdown through the puncture wear is caused by the direct damage to the line tube due to