Make sure that the connection point for the TV is set to 'component' and not 'composite'. It is common on modern TVs to have the composite video connection and the component video connection shared on a single input to the television. The TV won't know if you are sending it component or composite, so you need to tell the TV, in the menu setup, what type of connection you are using.
I'm not sure if it has a specific 'component' vs. 'composite' video input, or just 'INPUT 3' (or whatever) which is shared component/composite.
For what it's worth, it would be helpful for you to provide the exact model number for your TV and perhaps a link to an online manual so we can take a look at it and help you figure out exactly what may be going on.
Just Googling a bit and found this, which likely isn't helpful... But maybe...
- COMPONENT IN, VIDEO IN 2
This input can be used as a composite video input or as a component video input. When connecting mono device, connect to the L (MONO) audio jack.
For composite use, connect to VIDEO IN 2 for video, and to AUDIO (L/R) of
/
COMPONENT IN for audio signals.
For component connection, use Y, PB, PR for video signals and also connect to AUDIO (L/R) for audio signals.
The TV will automatically detect and switch between VIDEO IN 2 and
/
COMPONENT IN. To manually set the input type, press the HOME button, select
[Settings] →
[Channels & Inputs]/[Channels, Inputs & Ginga] → [Video 2/Component Selection].