I've bought a new Bravia TV and am trying to connect it to my (old) hifi system with external speakers). Phono plugs at both ends worked fine with my previous Sony TV

I've connected using the headphone cable that came with the TV (phono plugs on my hifi and headphone socket on the TV) Sound only comes through one speaker and not two

Both speakers work otherwise (eg when playing a CD)

Any help appreciated

Don't have the option of HDMI or optical cable as my venerable amplifier doesn't have these