Dvd playing hooked up to an old t.v. plays in color when i hook it up to my lg tv it plays in black and white?

When you are ready to play the DVD disc, you come to find that you are accessible to both the sound and picture. However, the pictures showed are only in black and white. It is quite undoubted that the movie disc that you have bought is not in black and white. Then a conclusion may draw then, something went wrong.
Here are more detailed explanation about the causes.

Source: Why is My DVD Playing in Black and White

You should confirm the TV in the system, the TV must be adjusted to the PAL or NTSC system based on the region you are in. When the TV system is also selected correctly, the DVD is also adjusted to the corresponding standard.

You can check on this article for some detailed reasons and more solutions for each issue:
Why is My DVD Playing in Black and White

You can refer to this article "Why is My DVD Playing in Black and White" and it tells the reasons and how to solve it.

My DVD player only plays in black and white - TOSHIBA FORUMS

forums.toshiba.com/.../My-DVD-player...plays-in-black-and-white/.../47...

39L1350U) and am trying to hook up the DVD player. ... My DVD player only plays in black and white ... My DVD player is an old Sony. .... Was using and S-Video connecting cable to the TV. ... suggested to use VIDEO instead of COLOR STREAM, I changed that in the TV menu, plug the red and while at the back of TV where ...

No Color When My DVD Player Is Hooked Up - Community ...

community.insigniaproducts.com/...DVD-Players/...Color...My-DVD-Pla...

Jul 14, 2014 - I hooked up my DVD player and I have no color. ... you need to use the connections on the left side of the TV or on connections on the back. .... is turned on, which can cause this black and white image issue you're having. ... If the Player shows correctly on a different TV with the same hook up, and different ...

The picture from a disc player displays on the TV in black ...