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飞跃12D1A黑白电视机出现无光栅伴音的故障时,说明直流供电电路工作正常,公共通道、伴音通道工作正常,故障可以从三个方面去分析:(1)亮度系统—阴栅电压发生变化,产生一个强反向电电场,阻止了电子束前进:(2)行扫描系统一无法产生高、中电压,以致电子束进入显象管锥体后无加速电场而衰落;(3)显象管本身衰老漏气极间短路或灯丝烧断。
Leap 12D1A black and white TV appear grating-free sound failure, indicating that the DC power supply circuit is working properly, public channels, sound channel is working properly, the failure can be analyzed from three aspects: (1) brightness system - the grid voltage changes, resulting A strong reverse electric field, to prevent the electron beam forward: (2) line scan system can not produce high and medium voltage, so that the electron beam into the pyramid after the absence of accelerated electric field and decline; (3) The picture tube itself Aging leaks between the very short circuit or the filament blown.