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T-Con board can't change picture position but main board can do it.
Do you have old main board and can install it in TV to see if it works?
If TV doesn't work with old main board then need to check part number off of label pasted on old and new main boards which must be same/ identical, it seems the new main board has different part number and causing the picture up side down issue.
Please reply back with the result and if problem resolved then a positive rating to answer would be highly appreciated.