Sorry again for the long post and multiple questions:

I tried once more, and even tried having only one ribbon cable or the other connected. Looks the slightly thinner (26 pin) one on top supplies the video. When I disconnect that the screen is completely blank. Disconnecting the bottom one seems to render the controls useless so I am guessing that is the ibus one.

I'm still not convinced the monitor is dead. I wish I had another way to bench test the unit. No one is going to let me test it in their car, I'll be lucky if someone will even let me plug my GPS units in.

Is it worth it to try and run three taps for RGB from the GPS harness connector to the monitor harness? In WDS "RGB Signals (Without VID Video module)" gives the pin mappings from the 18-pin GPS blue harness connector to 12-pin monitor blue harness connector I am just at a loss for how I can test this without having another car w/NAV available.

Are the wires that originate from the GPS side the same color if they terminate on the monitor side? This is what I was trying to prove with my multimeter and was getting strange voltage readings with the car battery disconnected and looping a 1.5V AAA battery across various pins (i.e. I was getting >1.5V readings on pins that should NOT have been getting supplied any voltage).

One last thing. If you pull the GPS unit - should the screen go blank or should it be white? Is there ANYWAY to test the harness out with just a multimeter or is this only possible with a oscilloscope? I just want to test for continuity I would think since I have 2 GPS units and the likelihood of both being bad is very small.

Lastly either I am assuming I did something wrong trying to tap the green channel to the Y input of my TV's or they are not multi-system (or was that just required for regular RCA video input?)

And this cable inside the screen housing is what you are saying is NOT worth reseating, it looks like it is clamped down pretty well anyway. I don't see any point in dissambling the screen portion if it won't do me any good either - though I have heard of some resistor or other component "melting" in here. Apparently from doing a little searching it should be fairly obvious is this is the case.

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