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机型:长虹 SF2911,属于长虹 CH—16机心(TDA9373超级单片机,微处理器为 CH05T1608)。故障现象:左右枕形失真,图像右移,顶部扭曲,初步看现象,断定是行 AFC 电路异常或者 I~2C 总线出错引起的。拆开后盖直接测 TDA9373/N100的(13)、(14)、(16)、(17)脚电压(如图1所示),发现(16)脚(行 AFC2端)电压为4.8V,不正常(正常值为2.8V),测外接电容C157正常,代换一同型号电容后故障不变,又依次代
Model: Changhong SF2911, belongs to Changhong CH-16 movement (TDA9373 super microcontroller, microprocessor for the CH05T1608). Symptoms: pincushion distortion, the image to the right, the top of the twist, the initial look at the phenomenon, concluded that the line AFC circuit abnormalities or I ~ 2C bus error caused. (13), (14), (16) and (17) voltage of the TDA9373 / N100 (as shown in Fig. 1) after opening the back cover and found that the voltage of the (16) Not normal (normal value is 2.8V), test the external capacitor C157 normal replacement of the same type of capacitor failure does not change, and then on behalf of