HDMI Splitter Issues

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scandypandy

Thread Starter
Joined
Jul 21, 2019
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2
I am having issues with an HDMI Splitter-specifically, I'm unsure if I'm using it correctly!

My setup is the following;
-Desktop PC
-Two monitors (one to GPU, the other to Motherboard)

I sometimes like to display my Main Monitor (GPU) to my television, situated on the wall above the desk. A friend suggested I use an HDMI splitter to duplicate the signal.
I borrowed one from another friend to try it.

The HDMI splitter is plugged via USB into my computer, required to power it.
The input is connected to my GPU via an HDMI cable.
My main monitor is connected to output 1 via an HDMI cable.
My television is connected to output 2 via an HDMI Cable.
The second monitor remains connected to the motherboard via HDMI.

When I boot the computer with all three displays on, it initially behaves as normal.
The display of the boot logo and (if opened) the boot menu are shown both on my main monitor and television.
However when I then fully boot the PC, my desktop is only shown on my two monitors and the Television reports that it has No Signal.

I'm using Windows 10.
Just curious as to whether I'm doing something wrong, or if the HDMI Splitter isn't what I need for the job!
Cheers.
 

cwwozniak

Chuck
Moderator
Joined
Nov 28, 2005
Messages
67,889
Hi scandypandy, and welcome to TSG.

It sounds like when Windows finally starts up it is running a display resolution and/or refresh rate that is supported by the main monitor, but not the television. If the television works OK when booting up the computer with the television connected directly to the GPU output, the controller is probably polling the television to determine supported resolutions and refresh rates. It then adjusts itself to work with the television. The HDMI splitter may only allow the GPU to read the settings of the device connected to input #1. Try swapping the connections on the HDMI splitter's outputs.
 

scandypandy

Thread Starter
Joined
Jul 21, 2019
Messages
2
That sounds right. I should have mentioned, by Main monitor is ultra-wide, that could cause the issue?
I'll swap them over, swap the inputs, and see where that takes me.
 

cwwozniak

Chuck
Moderator
Joined
Nov 28, 2005
Messages
67,889
A basic HDMI splitter will feed the exact same video to both outputs. Yes, the HDMI inputs on some HDTV televisions my be able to accept a limited range of non-broadcast HDTV resolutions and scale them to fit the screen but may be unable to handle anything too far out of range like an ultrawide format that goes beyond the HDTV 16:9 ratio.

EDIT: You may need to power cycle the computer if you swap outputs on the splitter. It depends on when the GPU checks for what the attached monitor can support.

If the TV and monitor both work at the same time when you swap them, you will probably find the ultrawide monitor running at a much lower resolution.
 
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