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Are you getting up the TV for the first time, or did iPlayer work ok on it for you previously?
Your Sony KDL-37EX503 does not yet have iPlayer approval so the app is not available for it. You will need to continue to use an external box to view iPlayer on your KDL-37EX503 TV.
For a list of compatible Sony TVs that have the iPlayer app, see https://www.bbc.co.uk/iplayer/help/Sony
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