I treated myself to a Mexican-made Hisense 50" last year, on sale at HH Gregg for $329. It came with a 2-year factory warranty, so I declined the store's extra-cost extended coverage. After a year, the led backlighting started blacking out at random, or anytime I used the kitchen microwave. It always came back on if I turned the set off, then on again. I called Hisense.
FWIW, their 800 number is also for Sharp electronics products, so maybe Hisense and Sharp are now related somehow.
Hisense sent me a UPS shipping voucher and packing instructions. Fortunately I'd saved the original box and foam. So I packed it up for shipping to their customer service center in Swaunee, Georgia. They sent me back a brand-new 50" smart set' with a new two year warranty.
Biggest hassle was securely re-boxing the set, then shoehorning it in the back seat of my car to take to UPS. (Hisense paid for the shipping, but according to UPS, pickup at my house would've cost extra)
Then they failed to notify me when the set was coming back, so I was out of town when UPS attempted delivery about 8 times! I had to go pick it up at the UPS warehouse after 7:30 PM, and again stuff it in the back of my car.
The new set survived it all, is working fine, and I can use my microwave again!
I have an older 32" LCD set that has the same blackout problem and no warranty. Also, a friend gave me his dead 32" LG set. I may try to fix those myself, someday when I have too much time on my hands.

Happy Motoring, Mark

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DrDKW