例1 熊猫C64P3型彩电(转修机) 故障现象:用户自诉:无字符(有图像、有伴音),且无论操作遥控按钮或按电视机上的操作键,屏幕均迅速变暗,以至无法看清画面,5s(秒钟)后,屏幕自动发光,AV输入信号及无信号时,亦是如此。检查过程:开机发现图像、伴音均正常,而且使用遥控器及本机操作键均能执行指令,只是在按任一操作键时,屏幕一片漆黑,也无字符显示,伴音始终正常,约5s(秒钟) Example 1 Panda C64P3 color TV (repair machine) Symptom: User self-prosecution: No characters (images, sound), and regardless of the operation of the remote control button or press the operation button on the TV, the screen quickly dimmed, and can not see Screen, 5s (seconds), the screen automatically glows, AV input signal and no signal, the same is true. Check the process: boot image, sound are normal, but also use the remote control and the local operation keys can execute the command, just by pressing any of the operation keys, the screen is dark, no character display, the sound is always normal, about 5s ( Second)