In order to determine the scope of failure in VCD AV input signal status, indicating that the aircraft is in AV mode. The machine uses a Panasonic CX1/MX-3C movement, are monolithic chip I2C bus (AN5192K) conducted AV / TV converter, rather than through the peripheral conversion circuit for AV / TV converter, tried to enter the bus maintenance state, about the AV / TV conversion project is not found, try to cancel hotel mode, still can not solve the problem. Because the AV on the remote control or machine panel / TV button to convert and character display is also normal to determine CPU trouble, the problem on a single chip, video switch has been turned on its internal external video signals, and can not accept through internal blind-frequency signals. Snow noise test machine after replacing the AN5192K-B grating, automatic search, the sound returned to normal, the image was a bit of purple into the bus and re-adjust the white balance after troubleshooting.mXQservice manual download site