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New MacBook Pro does not work with mini DVI-VGA adapter and Samsung 40" LCD

A

afsimola

macrumors newbie
Original poster
Oct 26, 2008
7
0
So I just got a brand new MBP and Apple's mini DVI-VGA adapter. My old MBP would hook up to the 1080p Samsung 40" LCD I have through Apple's standard DVI-VGA adapter perfectly fine. But now when I connect my new MBP the TV doesn't recognize the single. My MBP does read the TV and even adjusts when I plug the cable in, but nothing appears on the TV. I tried mirroring and changing resolutions, but nothing worked.

Any suggestions??

Thanks
 
Wait, mini-displayport to DVI and DVI-VGA or is it mini-displayport to VGA? I am not sure the first would work because I don't think the DVI port on the mini-displayport-DVI adapter has the analog pins for VGA. If it's the latter, then I'm not sure.
 
afsimola said:
Yes it's the latter. http://store.apple.com/uk/product/M9320G/A
Click to expand...

That's mini DVI.

You need a mini DisplayPort adapter, the new machines don't use mini DVI.

If you want to plug it in with a DVI cable you'd need mini DisplayPort to DVI, if you want to plug it in with VGA you need mini DisplayPort to VGA.

You can't do mini DisplayPort -> DVI -> DVI to VGA adapter -> VGA because the mini DisplayPort to DVI adapter only puts out the DVI signal, not a combined DVI/VGA signal and as such a DVI to VGA adapter won't work because there's no VGA signal to carry.
 
Same thing is happening with us MB guys.

I think I read somewhere that DisplayPort is digital only...so that VGA adapter Apple sells must have a DAC built in if that's the case.

The dongle may not be able to bump the output power high enough for these TV's to recognize it. Mine worked fine on an LCD monitor, but NOTHING on the TV, didn't even see the computer (the computer saw the TV just fine). I went back and got the DisplayPort-->DVI dongle and then a DVI--->HDMI cable, and its perfect, 1080i output from the laptop.
 
NewMacbookPlz said:
Same thing is happening with us MB guys.

I think I read somewhere that DisplayPort is digital only...so that VGA adapter Apple sells must have a DAC built in if that's the case.

The dongle may not be able to bump the output power high enough for these TV's to recognize it. Mine worked fine on an LCD monitor, but NOTHING on the TV, didn't even see the computer (the computer saw the TV just fine). I went back and got the DisplayPort-->DVI dongle and then a DVI--->HDMI cable, and its perfect, 1080i output from the laptop.
Click to expand...

ive just gotten my MB and its giving me the same problem. it is really frustrating the **** out of me. I have a Samsung LCD TV. just to confirm....what u did was. 1) http://store.apple.com/us/product/MB570Z/A?fnode=MTY1NDA3Ng&mco=MjE0ODQ0Mg and then 2) http://store.apple.com/us/product/TR842LL/A?fnode=MTY1NDA3Ng&mco=MjQzNDExMw and it worked?
 
afsimola said:
So I just got a brand new MBP and Apple's mini DVI-VGA adapter. My old MBP would hook up to the 1080p Samsung 40" LCD I have through Apple's standard DVI-VGA adapter perfectly fine. But now when I connect my new MBP the TV doesn't recognize the single. My MBP does read the TV and even adjusts when I plug the cable in, but nothing appears on the TV. I tried mirroring and changing resolutions, but nothing worked.

Any suggestions??

Thanks
Click to expand...

The Mini DisplayPort (not mini dvi) to DVI out put is digital, not analogue. The audio information from the Mini DisplayPort is also lost.

There are several types of DVI.
http://en.wikipedia.org/wiki/Digital_Visual_Interface

* DVI-D (digital only)
* DVI-A (analog only)
* DVI-I (integrated, digital & analog)

If you look at the DVI connector (female) of the Mini DisplayPort to DVI converter. You will see that it is a DVI-D. Therefore, the analogue signals required for VGA are not routed.
 
Not the best of help but I went down the mini DP > DVI > HDMI route and it works flawlessly. Full 1080p, 1:1 match etc.
 
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