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  #1  
Old 02-01-2008, 05:06 PM
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Question Another Blank Screen problem

I have an OEM Navigation system (Mk4) which was working until we had some flat battery trouble. Now we have a blank screen.
From what I hear the old Mk3 firmware's were susceptible to voltage spikes and jump-starting could kill them.
We now have a blank (but backlit screen). The radio works fine, and you can still operate the channels, even select TV (audio only) but no picture. I don't know my way through the menus well enough blind to get voice prompts see if the GPS is still working.
I've tried swapping back to the MK3 but that didn't work either which lead me to believe that perhaps it wasn't the computer.
Our local BMW Dealership diagnosed the "Head Unit" (display). So I replaced that with a working (I was assured) unit from ebay but it's exactly the same problem.
I've tried putting a V29 firmware CD into the computer because I understand that it will eject when it finishes and that might fix a problem with the computer flash. I've done that, but nothing visible still. The eject button works OK, the light comes on, it whirrs into life but I don't get a picture.

I'm forced to conclude one of three things;
1) The dealership misdiagnosed the fault - it isn't the head unit after all.
2) The 'new' replacement head unit/display has the exact same fault as my unit and was sold to me by a scammer.
3) I broke something else putting in the display (unlikely).

Does anyone have any other ideas, or recommend where I might be able to get it fixed?

I now have two computers, a MK3 and MK4 and two head units. The navigation doesn't work with any combination. Presumably if BMW didn’t quote the GPS as being at fault they’ve managed to ‘talk’ to it over the iBus successfully?

Last edited by danieljsinclair; 02-01-2008 at 05:09 PM. Reason: poor rendering
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  #2  
Old 02-01-2008, 05:37 PM
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try removing MK 3-4 Your tv module should pickup the video and show on a screen if everything is ok with module and screen.

Could it be that your cables got damaged? or not well connected.

I would allso try with mk4 connected remove battery, to make all the car system reboot. (helpt me with stereo module issues)
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Old 02-02-2008, 11:42 AM
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Thanks for the pointer, but the battery was replaced recently. Disconnecting the nav doesn't help.

Any other ideas?
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Old 02-02-2008, 07:40 PM
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your tv module should take over display when no mk unit is present, so it is cables or navscreen that is faulty
Can you check your screen in a another car to confirm or exclude..
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  #5  
Old 02-03-2008, 10:07 AM
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Unfortunately, I don't have any other cars to test the display in, but the one I bought on ebay was working I was assured. It's the same problem with either one.

I've also tried pulling the blue plug from the TV unit and plugging directly into the GPS which was a suggestion on another board - still nothing.

I'm not quite sure where to go from here. I guess I need a wiring diagram.

Someone on yet another list reckoned that jump starting can kill the systems, but there's an inline surge protector between the GPS unit and something else that is easily fixed as a result of voltage spikes due to jump starting (I had to do this many times - the unit stopped working at the same time).

Have you heard of this?
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Old 02-03-2008, 06:49 PM
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Check the ground wire from batt remove and clean, bad ground can give you problems
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Old 03-14-2008, 02:59 PM
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After ending up in another disscution about nav, i think that i know what might be the issue.
If you have TV module the connection betwean MK and Screan is serial, whitch means if TV Module is dissconnected or broken no picture wil show.

Hope this info helps
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  #8  
Old 03-17-2008, 06:59 AM
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Resolved

Well it could have been any one of the problems posted here. Thanks to all for suggestions.

It turns out the dealer was right after all. The 'new' monitor I fitted didn't work initially, but the dealer got it going again. I wasn't clear on why it didn't work, but the service person muttered something obscure about needing to recode the unit to 'accept' it's new home. The one I fitted came from an X5 so perhaps it needed a nudge to get it going.

As a side-effect, my TrafficMaster box no longer works either, but with a Mk4 GPS I don't really care about that. I'm just glad it wasn't causing the screen to go blank because its hard-wired and you can't quick-bypass it out like you can with a faulty TV monitor.
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