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Hello and thank you for the question! Your problem could be a simple fix. The ribbon connections on the buffer board...looking from the back with the back cover removed it is located on the left side. It is possible that fixing will require removing the ribbon connectors and reseating them especially the ribbon that corresponds in the same place on the screen where the horizontal line is located. If this does not fix then the next step is to replace the buffer board(s) themselves. And if it still does not fix then the connection causing the line is an internal one and would not be worth repairing.