I feel like they probably have something to do with light level detection or infrared signal receiving but I genuinely have no idea. They could just as likely be part of the sound system for all I know.
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The TV is a Sony KP-43T85T or similar. The service manual is here with on page 55 the exact part: https://www.manualslib.com/manual/772761/Sony-Kp-43t85t.html?page=55#manual
It states “3D COMB FILTER” and is part of the picture in picture mode. It’s probably an optional upgrade, which is why it’s on a separate board if I were to guess.
