Connecting to samsung smart tv

SOURCE: JVC receiver RX-6032 VSL is showing linear pcm,

Linear PCM is the way in which the sound is encoded in a CD, an uncompressed stereo format. It means that the audio setting is set on that system, not on Dolby Digital - what you would need to listen to 5.1 channels.
To get that back just press the INPUT DIGITAL button on the front panel repeatedly until the DOLBY DIGITAL label is displayed. If nothing happens when you do that or the signal isn't recognized as such then the defect is hardware - the audio decoder has failed and it will have to be replaced. This is a very big job that only a repair shop could do it - could, not surely can, because the replacement mainboard on which it's glued will be extremely hard to find, it's been out of production for a very long time now.

SOURCE: Can I connect my Magnavox

Think about this. Your TV is NOT the source of HiFi multichannel sound, but the source IT is watching might be. THAT is the best place to get the digital audio you want for the receiver. Run digital audio cables from he Cable Box, Sa, DV. BluRa, whatever to the JVC.

I also advise against running video THROUGH the receiver, opting for direct best conenctions from the source to the TV.

You SHOULD run at least a composite video cable from the receiver to the TV so you can use it to set up receiver things.