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Originally Posted by we350z
a) provide an alternate video signal to the bordmonitor (i.e. VGA, component video) so it can be bench tested
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Only using a BMW device as source. The monitor uses RGB, but has sync on green (RGsB). Not many if any devices support RGsB.
Plus, you need to wake up the monitor with ibus messages, which unless you have other BMW devices or emulators on your test bench, won't be possible.
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Originally Posted by we350z
b) output video signal for the GPS units to an external standard television or computer monitor (i.e. old CRT, etc...)
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Yep. Connect a standard TV to the green output. It will have sync on it, so the TV will sync. But you will of course only see the green signal. But you will see something. Make sure the TV is a multi-system TV.
Easier is to look at all 3 signals with an oscilloscope.
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Originally Posted by we350z
I would like to know certifiably without any doubt that the monitor is not working. Also I am not sure if it is worthwhile for me to dissasemble the unit if I will be refunded or reimbursed for repair.
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Easiest way is to try in another car with a known good system
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Originally Posted by we350z
What do you mean by measuring the fuse... Use a multimeter or something?
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You could use the ruler, and determine the size in mm. But that won't help you. Yes, I mean use a multimeter, make sure you have no fuses with cracks you cannot see.
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Originally Posted by we350z
I think the ribbon cable having loose connection is very possible. The screen is white with radio on or off and I think it stays white even if i disconnect the GPS unit entirely.
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White = no video signals at all.
Dismantling is straight forward in terms of separating the screen from the body.
Good luck!