My older VCR is also not working with the TCL Roku TV. I have a cable with the 3 components at one end and the AV (to go in AV connection) at the other end. I robbed it off an older Roku box I have. But it is not working. Sound is ok with a buzz added and picture is no good. Any ideas of what I should do? Its a new TV. Cable was working fine yesterday (on different TV hooked to an old Roku Box). Is there something wrong with the TV?
The TV did not come with a cable. Mixing the output of the RCA end did not change anything. Thank you for your advice that the cable I have may be mono directional. Since I had been successfully using it for an AV to RCA application but now it does not work for RCA to AV, likely the cable does not do what I am trying to force it to do. Which is a better scenario than a brand new TV's AV input not working. I can get a RCA to AV adaptor from Amazon for $7 or I can even get a RCA to HDMI cable for $11 and up. However, I think I will just move this old VCR of mine to a digital TV I have that has the 3 RCA inputs.
If you look at the pinout for that adapter it looks a little non-standard. Ground is usually one of the end two conductors. I don't know how handy you are or if you have an Ohmmeter, but you could check the adapter you have to see if it matches that one.