When you run coax cable throughout a new home

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I’m seeing a couple whites and some blacks

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always a bad sign

What do you mean main junction?

They come in both colors, but I thought black was in wall or exterior.
Not racist!

In my closet there once was a big arse splitter where (I believe) the main cable line that came into the house was distributed to the rest of the house. One day Comcast came and for some reason removed the splitter and joined just two wires. I can’t rememver why. But everything worked as we needed. Now I want to make sure cable goes to a particular jack that isn’t working (because splitter gone), and I’m trying to figure
Out of the color of the mystery, unsplit cables means anything.

There is one line coming in but of course it can be split off in many different directions to go to the various rooms.

I don’t want to call these Comcast dudes back.

Multiple coaxial cables Baw.

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I’m seeing a couple whites and some blacks.

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Time to move

Check the color of the one in the room you are trying to feed and remove and tie in color as needed where the splitter was. Make sure you mark the "in" and "out" as they are now. Will mean moving a TV from room to room.

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There is one line coming in but of course it can be split off in many different directions to go to the various rooms.

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What grade wire you have?

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and some blacks.

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Move to a new neighborhood.