Audio on a CRT TV

Hello, have a CRT television with white and yellow RCA in the back, and a 3.5 presumably for audio (it has a headphone symbol above it) in the front. I have been using the RCA for video transmission from my laptop with the help of a signal converter from Amazon. However, it does not play my laptop's audio. I've tried using a M/M 3.5 cable to hook the sound port up to my laptop, but it still doesn't work. I made sure my laptop is using the right output. The TV just won't do it. What am I missing?