Originally Posted by fastest finger:
“We got to the thorny issues of HDMI cables and I told the assistant I had what I needed. She insisted the old ones I had wouldn't work. When I explained they were all high-speed and perfectly up to the task, she then hit back that only gold plated ones worked with 4K TVs. When I politely rejected that claim, she snapped back with "Well don't come back blaming me when the picture's rubbish. If you put crap in, you get crap out"”
My sales assistant went through the same steps in the same order, but carried it on further than yours. The steps were;
1) you need these £80 cables because they're high-speed (I explained that I was only using an HD source but he insisted that I would still need high speed cables because the TV upscales to 4K internally)
2) you need these £80 cables because they're gold plated (I explained that the cables I already have are gold plated, they weren't expensive)
3) you need these £80 cables because they have an amplifier and signal conditioning chip inside them (it sounds like this is where yours gave up, but mine had a diagram on the wall showing an exploded view of an HDMI connector with a chip inside it, possibly useful for long cable runs but completely unnecessary for short cables)
4) It's science!!! (when I couldn't get him to stop with the vague pseudo-science drivel I gave up and just left)
As someone who's worked as a scientist and engineer in the electronics industry my whole career, it really annoys me when people like that hoodwink unsuspecting members of the public with misrepresentation that might sound vaguely right at the time (until they get home and think about it at least), it's an abuse of their ill-deserved position of trust.