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MBP->MiniDisplayPort->Hdmi->DVI->VGA LCD externl…no pictureHere's the , what's wrong?

N

NazgulRR

macrumors 6502
Original poster
Oct 4, 2010
423
83
Here's the picture:
SKPb9.jpg


I have a MiniDisplay Port to HDMI adapter, which I plug into HDMI-DVI adapter, which goes into DVI-VGA adapter to which I have connected VGA cable from LG LCD screen.

MBP recognizes the external LCD LG screen fine, but the LG doesn't show any picture. I also tried with one other external VGA LCD screen. Same thing, no picture.

I know 100% that VGA cable, VGA-DVI adapter and MiniDisplay Port-HDMI adapter all work. I cannot test the HDMI-DVI adapter anywhere though. Could it be the problem? Or is just that it's too many adapters?

EDIT: Sorry for the huge picture.
 
Last edited by a moderator:
HDMI - Digital
VGA - Analog

It doesn't work because the signal from MBP is digital while your monitor uses analog input. You need mDP to VGA to make it work
 
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I found out the hard way as well, I had a mDP to DVI with a DVI to VGA converter, and had to go out and buy a mDP to VGA to make it work.
 
DVI-D: digital
DVI-A: analog
DVI-I: DVI-D + DVI-A

So even if you have a DVI-I connector, if it's receiving only DVI-D on one side, and is expecting only DVI-A on the other (or vice-versa), nothing will be transmitted.
 
works up to here:

MBP->MiniDisplayPort->Hdmi->DVI

DVI--> VGA doesn't work for the reasons listed above

you need a minidisplayport-->vga adapter
 
NazgulRR said:
Here's the picture:
SKPb9.jpg


I have a MiniDisplay Port to HDMI adapter, which I plug into HDMI-DVI adapter, which goes into DVI-VGA adapter to which I have connected VGA cable from LG LCD screen.

MBP recognizes the external LCD LG screen fine, but the LG doesn't show any picture. I also tried with one other external VGA LCD screen. Same thing, no picture.

I know 100% that VGA cable, VGA-DVI adapter and MiniDisplay Port-HDMI adapter all work. I cannot test the HDMI-DVI adapter anywhere though. Could it be the problem? Or is just that it's too many adapters?

EDIT: Sorry for the huge picture.
Click to expand...

Holy adapters batman!
 
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