How difficult would it be to add a/v input into an existing device (such as a portable dvd player) with currently no a/v inputs, but only a/v outs?
My reasoning is that I received a hand-me-down portable player, but I was under the impression that it could handle A/V in by default; so I was about to plug in a Playstation (or other game console) into it. Understandably, I could sell the portable player and buy a portable screen with money to spare, however in my case, it's a matter of respect for the party that gave me the said device.
Any EE's around?
Probably too difficult. But, if you don't mind taking the risk of breaking it, you could at least open it up and take a look at the board to see if it is obvious what to do. If the manufacturer makes a slightly different model with a video in, they might use the same board in the device, only minus the connector. It's a long shot though