User: A Home Appliance Company

Measured Object: 72-inch Rear Projection Tv

Question: During The Conduction Sensitivity Test, It Was Found That The 430mhz Frequency Point Could Not Pass The Test, That Is, If The 430mhz Rf Signal Is Input From The Tv's Video Port, 'snowflakes' Will Appear On The Tv Screen.

Solution:

     Use Emscan To Test The Tested Product, And Compare And Analyze The Test Results To Find The Sensitive Frequency Of The Tested Product, And Then Analyze The Distribution Of The Flat Rate To Find The Weak Points.

The Measurement Results Found That When The 430mhz Signal Was Input From The Video Port, The Video Filter Did Not Filter The 860mhz Second Harmonic Of 430mhz. The 860mhz Signal Was First Passed To The Power Supply Of The Control Circuit, And Then Passed To The Power Supply Of The Control Circuit. On The Power Supply Of The Display Circuit.

The Power Supply Of The Display Circuit Is Generated By The Dc/dc Conversion Of The Power Supply Of The Control Circuit. After Filtering Means Is Added To The Dc/dc Power Supply Circuit, The Above-mentioned Problems Can Be Solved.