I tried to connect my DVD Player to a TCL ROKU TV.

[amableliz]

I connect the 3 colors cables to both. The TV said "no signal". Audio L (white), Audio R(red) and the yellow in coaxial. Also I used a HDMI to composite av adapter but nothing happen.

 

[Lutfij]

If you're referring to the three ports located at the back like so(generic image, since we don't know SKU of the TV)

Then there should be an option in your remote to switch between the inputs.

This is assuming that the ports are input, ofc.

Please state the make and model of the DVD player as well as the SKU for the TV.

 

[avallone0]

I connect the 3 colors cables to both. The TV said "no signal". Audio L (white), Audio R(red) and the yellow in coaxial. Also I used a HDMI to composite av adapter but nothing happen.

 

[kisseysears]

If you're referring to the three ports located at the back like so(generic image, since we don't know SKU of the TV)

Then there should be an option in your remote to switch between the inputs.

This is assuming that the ports are input, ofc.

Please state the make and model of the DVD player as well as the SKU for the TV.

 

[kisseysears]

My tv is a tic rogue tv and my DVD player is a magnavox

 

[americanaudiophile]

Without model numbers the brands don't help much.
If the TV has AV inputs did you select that input on the TV? You may have to select it from the onscreen display rather than just press a button on the remote.
Are you sure that the DVD player works?