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User profile for user: ShortJ2016
ShortJ2016 Author
User level: Level 1
8 points

Connecting one laptop to multiple projectors

I have the HDMI splitter from this vender at amazon: https://www.amazon.com/Splitter-Adapter-Converter-players-Projectors/dp/B01E6QPI T6/ref=sr_1_14?s=electronics&ie=UTF8&qid=1467901191&sr=1-14&keywords=HDMI+splitt er


in which I am trying to connect to projectors to a single laptop. My organization uses both Mac and PC. I have one HDMI running to a coupler, and the coupler connected to the splitter. The splitter then runs two separate HDMI cables. One cable to each projector. When I connect the laptop, neither projector displays. Is there something that I am doing wrong or something that I could do to fix this? I work for a non-profit organization, so I cannot afford many more devices, cables, or other materials. Any help is greatly appreciated.

MacBook Pro with Retina display

Posted on Jul 18, 2016 10:10 AM

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4 replies
User profile for user: lllaass
lllaass
User level: Level 10
210,405 points

Jul 18, 2016 10:36 AM in response to ShortJ2016

What model MacBook Pro?

What is a coupler in "HDMI running to a coupler"

What is resolution of the monitors?

If you only connect one monitor to the splitter does that work?

Does the setup work on another computer?

It could be that MacBook does not provide enough power.


The link for the splitter includes this:

Note:

1. not Support HDCP. not Support MACBOOK.

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
126,781 points

Jul 18, 2016 10:40 AM in response to ShortJ2016

The Mac uses a highly-parameterized Driver for all displays. It is configured in response to the display's response to a query for the display name and capabilities (such as resolution range possible). This query is sent only at certain times:


• at Startup

• when using Option-(detect displays) in system preferences > Displays

• on wake from sleep

• on insertion of the Mac-end of the display cable or adapter.


In order to obtain ANY picture, your Hardware must provide a pass-through of the EDID channel back to the Mac, and a display that is working properly must respond with it name and capabilities. The display-name will then be shown as the title of the window showing that particular display's features and capabilities.


... So a common way to operate is to connect one display, then sleep-and-wake the Mac or remove and insert its cable. Then one display should respond with an appropriate picture. Later, the second display can be added without additional intervention.

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Connecting one laptop to multiple projectors

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