I have samsung 5-series 5003 FHD TV, I want to connect with my sony stereo but TV has no audio out no RCA, NO optical, no digital, only two internal speakers are there, please help to me.
You can wire a speaker to line level converter to the wires that connect the TV internal speakers. That will give you a variable line level output. Not electrically complicated but you will have to get into the TV and void the warranty.
If you want to switch between the internal and external sound you would need to wire a switch or use external jumpers to turn the TV speakers on.