NEED TO ASK A TECHNICAL QUESTION AND ALSO PART #

I HAVE A SONY PROJECTION TV MODEL# KP53HS30. I HAVE NO VIDEO ON MAIN TUNER AND ANY COMPOSITE INPUT. PIP TUNER WORKS FINE AND ALSO COMPONENT WORK FINE. ALSO COMPOSITE DOES NOT WORK USING PIP INPUT. I BELIEVE THE PROBLEM IS THE 3D COMB FILTER BOARD. CAN YOU GIVE ME YOUR OPINION AND A PART#. THANKS ED

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