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笔者修过两台彩电,尽管机器已修好,但故障机理不其明白,请高手指点一二。例1:一台长虹2594AV 彩电,开机正常,换台也正常,但过几分钟后换台就无图像,而伴音一直正常,屏幕上述图像自激样雪化拉丝。关机后立即开机又正常,过一会换台又出现上述故障。但开机后只要不换台则一直正常。检修:由于伴音正常,AV 时同样拉丝无图像,证明公共通道工作正常,故障在视频通道。检测TDA8361各脚电压,发现(14)脚(清晰度控制电压输入端)电压由正常4.8V 变为不正常的1V,(26)脚(色
The author repaired two TV sets, although the machine has been repaired, but the failure mechanism does not understand, please expert guidance January 2. Example 1: A Changhong 2594AV color TV, boot is normal, change the station is normal, but after a few minutes to change the stage no image, and the sound has been normal, the screen above the image self-excited kind of brushed. Shut down immediately after the boot and normal, after a while for Taiwan and the above-mentioned failure. However, as long as the station does not change after the boot has been normal. Overhaul: As the sound is normal, the AV drawing the same image, to prove that the public channel is working properly, the fault in the video channel. TDA8361 detection of the voltage of each foot and found (14) feet (definition control voltage input) voltage from normal 4.8V to abnormal 1V, (26) feet (color