Click to expand.Assuming that you've got the Baud rate and other parameters set up as per the TV's serial input requirements, the simplest possibility is that you require a STRAIGHT-connected cable, rather than the CROSSED cable you bought on Ebay. The simplest way now is to buy a CROSS-connected RS232, 9-pin, male to female extension cable and connect the 2 cables together, which then gives a STRAIGHT connection. If that still doesn't work, it's probably because a different wiring schema has been used for the 3.5mm plug end. In which case, you'll need to find out the required wiring for each end, and buy the connectors to make your own cable.

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