I bought a ~$6k TV and had a back light go out. Was actually during the OEM warranty but Samsung was giving some excuse about shipping damage (which is BS - the set was delivered and installed by Best Buy with everything working for a month afterward).

I called Amex and they took the claim and gave me the name of an authorised repair shop. I had to send Amex the response from Samsung saying they would not cover it. Tech came out, did some paperwork on the problem, and then came back and replaced the panel a couple weeks later. Bill went straight to Amex and that was the last I heard of it. Not sure if this was extended warranty or purchase protection, but I was happy with the outcome.