There are solder tag HDMI plugs on Amazon. There'll probably be some on Ebay too. There are also versions with the screw terminals built in to the back of the plug. Here's a
link.
Whether you can use a solder tag plug depends heavily on the metal that the cable's conductors is made from. Bare off some of the insulation and scrape the bare metal surface. If it's still copper coloured then you're good to go. However, if you find it looks shiny silver then chances are it's aluminium with just a surface flash of copper. That's no good. In that case a screw terminal plug is your solution.
Be careful not to mess around with the individual conductor lengths. This is because HDMI relies on sending three data signals plus a timing signal all in sync with each other to describe each pixel of the picture. The lengths of the individual conductors can change the relative timing. Also, the higher the resolution of the signal then the more critical the timing and so the much smaller length changes have a big effect.
These plugs are between £8 and £15 on average. That's a lot cheaper than breaking the wall open and then making good after. Bottom line; it's worth a shot. If it works, then great. If not, then at least you know you've tried and the cost to do it wasn't a lot.
Going forward, next time you do an install, make sure to put the cable in to some conduit in a way that makes it easy to pull and replace should the need arise.
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