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在检修日立CMT2518型64 cm(25 in)大屏幕彩色电视机时发现,该机通电开机后,屏幕中间出现一条约7mm宽的水平亮带,该亮带先呈白色接着又变为蓝色,然后转为红、绿色交替变化,约几分钟后,机内出现“吱吱”叫声,最后光栅消失。感到此故障较为特殊,为此,将其检修过程叙述如下以示同事。故障分析:屏幕中间出现约7 mm宽的亮带,估计是场扫描电路异常引起的;亮带颜色变化与色度电路有关,且工作几分钟后光栅消失,说明保护电路动作,因而还存在过压或过流问题。
Overhaul Hitachi CMT2518 64 cm (25 in) large-screen color TV and found that the machine is powered on, the middle of the screen appears a horizontal bright band about 7mm wide, the bright band first white then blue, Then turn red, green alternating changes, about a few minutes later, the machine “creak” sound, the last grating disappears. Feel this fault is more special, to this end, the maintenance process described below to show colleagues. Failure Analysis: The middle of the screen appears about 7 mm wide bright band, it is estimated that the field scanning circuit caused by anomaly; bright band color change and chroma circuit, and the work of the grating disappears after a few minutes, indicating the protection circuit action, which also exists Pressure or over-current problems.