Screen turned in to a smal green corner

After turning the tv on, the screen turned into a small green square in the corner of the screen. Any Idea how to fix this?

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@abc50672 first verify that your TV is a RTU5820. Then post an image of what your screen is actually showing you. Next you want to tell us what you have checked and what you have already tried. This could be an issue with the main board but it is also possible that this is an issue with the buffer boards. 기존 질문에 이미지 추가하기

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