Then CNET Cheapskate noted Sceptre TVs in a recent post. https://www.walmart.com/ip/Sceptre-65-Class-4K-Ultra-HD-2160P-LED-TV-U650CV-U/48874705 is under 500USD so be sure you can change parts and beat this price.
At 8 years old I might not even try.
I have a 60 LD550-UB. TV worked fine last night and today when turning it on it wont get get past the LG title screen.
Looking up possible problems i found perhaps a capacitor was blown. I removed the back but cannot find any issue with any capacitor or any other piece of equipment.
The red light would simply slowly blink. I lost count after about 20 blinks.