开机出现若干条灰带,自下而上,有时卷边至整个屏幕,灰带经过部分图像,几分钟后消失,可正常收看到结束,第二天又重复上述故障。根据笔者在近几年维修大量的属松下M15L机芯的彩电,总结了这是松下M15L机芯彩电在使用多年后多发的一种通病。如:TC—2171、TC—2173、TC—2185、TC—2186、TC—D21、TC—D25均采用了M15L机芯。上述故障的根本原因是:图像、伴音中频放大电路 There are a number of gray boot, bottom up, sometimes curling to the entire screen, the gray belt through the part of the image disappears after a few minutes, you can normally watch the end, the next day and repeat the above failure. According to the author in recent years to repair a large number of Panasonic M15L movement color TV, summed up this is Panasonic M15L movement color TV in use for many years after a common problem. Such as: TC-2171, TC-2173, TC-2185, TC-2186, TC-D21, TC-D25 are used M15L movement. The root cause of the above failure is: image, audio intermediate frequency amplifier circuit