The TCon is the board on the panel where the cable you have just cleaned connects to. As it did work briefly may be worth trying again - did you reseat both ends.
If not, we can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.
Please do not post inline and offsite as they slow down the loading of pages.
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