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例1:一台长虹R3418T(长虹CN—7机芯)彩电,无伴音,蓝背景。打开时,图像消失,出现“红双喜”字符。检修:根据现象分析,可判断为CPU没有得到电台识别信号。该机CPU“脚电压只有0.1V(正常值为4.2V),怀疑小信号处理块TB1227AN损坏。更换后故障依旧。因该机芯的TB1227AN%$脚输出的电台识别信号有两种方式:一种方式是电压信号;另一种方式是脉
Example 1: A Changhong R3418T (Changhong CN-7 movement) color TV, no sound, blue background. When opened, the image disappears and ”Double Happiness “ character appears. Overhaul: According to the phenomenon analysis, it can be judged that the CPU does not get the radio identification signal. The machine CPU ”foot voltage is only 0.1V (normal value is 4.2V), suspected small signal processing block TB1227AN damage.Repair after the fault remains the same.Because the movement of the TB1227AN% $ foot radio identification signal output in two ways: One way is the voltage signal; the other way is the pulse