Ok here's my pickle,
I removed a Pioneer head unit and replaced it with a Sony, they seem to have the same plug so it was an easy switch. All seemed to be going well when I went to check if it was working I found that it powers up and takes/ejects a cd but the display doesn't light up at all.
I reconnected the Pioneer to test it and have the same problem with it, it takes/ejects cd's, even plays but the display shows nothing.
I can't see any loose wires/dodgy connection and it's got me stumped.
If anyone could help me on this I would be very appreciative.