故障现象:每次开机收看电视节目时,开始总有个别频道出现不规律的跑台现象,有时还能自动跟踪回来;随着收看时间的增加,故障严重时,能从一个频道跑到另一个频道上去。关机后,重新开机能够回到原来的频道上,但图像和声音有时不佳。这是一种令人比较头疼的故障,常常使维修者无从下手。按照一般规律,经常采用的方法是:首先考虑 Symptoms: Each time you start watching television programs, there are always irregular channel began to appear irregular treadmill, and sometimes automatically track back; with the watch time increases, the fault is serious, can run from one channel to another Go up the channel After shutdown, reboot to return to the original channel, but the image and sound sometimes poor. This is a more troublesome headache and often leaves maintenance workers alone. In accordance with the general law, the method is often used: First consider