彩电跑台属常见易发故障,其主要原因是图像中频回路、AFT回路失谐、高频头内变容管反向特性变坏所致。对中频回路引起的跑台故障其判断方法有以下技巧。开机后,如果随时间延长缓慢跑台,一种情况是刚开机或收看过程中换台,声音、图像均正常,随时间延长图声逐渐变差,接着出现不同步,直至图声全部消失。这类现象的原因多为 Color TV sets are common prone to failure, the main reason is the image IF circuit, AFT loop detuning, varactor head varactor reverse characteristic deterioration. On the IF circuit caused by the treadmill failure to determine its methods have the following tips. After powering on, if you slowly run the desk over time, one situation is when you just power on or watch the desk, the sound and the picture are normal, and the picture becomes worse with the passage of time. Then, the audio is not synchronized until the audio of the picture disappears completely. There are many reasons for this phenomenon