My Panasonic 65" plasma has a standard C15 IEC connector. My DIY cord is a DH Labs Encore cable with a Furutech silver IEC and a Furutech gold male plug. I don't listen to the TV speakers so, no comment on the sound (my tv sound is routed through the stereo system). The picture is easily seen as being better than with the stock cord. In addition, I can also easily see the difference between the Furutech FI-11 gold male and an Iego (eye-ee-go) gold male plug. In this case the Furutech plug is better. So, yes, my DIY power cord is easily improving the picture quality. To my ear, both the Encore wire and any silver connector or wire will be bright sounding so, maybe that brightness characteristic contributes to the improved picture that I observe.
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I changed the cable on our TV and did not really notice any change.
But when my wife turned on the TV, she asked "what had I done to the TV" - she noticed it was brighter, with better colour, contrast and details in the dark areas.
I've since learned what to look for and now my TV's have custom power cables.
Turns out I'm more like a bat - lousy eyesight, but GREAT HEARING.!
Yes they DO make a difference !
Regards - Steve
@willgolf - yes, this is a diy cable and I paired it with the Furutech’s FI-50 ncf connectors. Sorry that I have never tried DH Labs cables so really can’t compare the two. But for many years Nanotec power cords are quite famous for their use in video applications especially in Asia so you can do more research and maybe give it a try.
I got mine from these guys as I live in Vancouver Canada.
@willlgolf - know what you mean, my Sony had the same problem
I used one of these
Schurter 4781.0100 Cryo Treated - Deep Cryo Treated AC Connectors - (takefiveaudio.com)
It worked well on the Sony
My Samsung takes the normal figure 8 plugs