四、A3机芯解密代码及A6机芯解密代码例5 海信TC2519M型彩电,主电路采用三洋机芯,电脑CPU采用M34300N4—721SP型号芯片。故障现象:每次开机后,机器就会自动切换到AV状态,手动切换到TV状态后,不能进行搜台操作,此时只有“频道”、“音量”升/降键功能正常,其他的按键(如预置键PRE)均无效。听用户说,该机是雷击转修机,曾换过CPU(M34300N4—721SP)芯片。笔者接手该机后,检测CPU的各引脚电压都正常,并且外围元件 Four, A3 movement decryption code and A6 movement decryption code Example 5 Hisense TC2519M color TV, the main circuit using Sanyo movement, the computer CPU using M34300N4-721SP model chips. Symptoms: After each boot, the machine will automatically switch to the AV state, manually switch to the TV state, can not search Taiwan operation, this time only the “channel”, “Volume” up / down key function is normal, the other keys (Such as preset button PRE) are invalid. Listen to the user that this machine is a lightning strike machine, had changed CPU (M34300N4-721SP) chip. After the author took over the aircraft, testing the pin voltage of the CPU are normal, and the external components