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例5:长虹C2919P彩电,打开电源绿色指示灯亮,“二次开机”无光、无声。分析与检修:检查CPU的工作条件正常,测I~2C总线电压异常,断开存储器后,总线电压恢复正常,判断存储器DQA07(UPD6252)损坏。在市场上购买一只UPD6252更换后,机器不能完全恢复正常,估计是空存储器,需要进行初始化操作,写入数据后才能恢复正常。查阅该机相关资料,该机属NC—3机芯,根据资料介绍的方法进行数据输入。方法是:开机,同时按遥控器上的“F”和“TV/AV”转换键,再按顺序按遥控器上的“1”、“0”、“4”、“8”键,此时屏显为“M”字符,表明进入维修状态。按遥控器上
Example 5: Changhong C2919P color TV, turn on the power Green light, “second boot” no light, no sound. Analysis and Maintenance: Check the CPU working conditions normal, measured I ~ 2C bus voltage anomalies, disconnect the memory, the bus voltage back to normal, determine the memory DQA07 (UPD6252) damage. In the market to buy an UPD6252 replacement, the machine can not be fully restored to normal, it is estimated that the empty memory, the need for initialization, write data to return to normal. Access to the aircraft related information, the machine is NC-3 movement, according to the method of data entry data input. The method is: Turn on the machine, press the “F” and “TV / AV” conversion keys on the remote controller at the same time, and then press the “1”, “0”, “4” and “8” keys on the remote controller Screen is “M” character, indicating that the maintenance status. Press on the remote control