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Power Cycling TV 2 Years Old


I have the Samsung UN65ku6500fxza. It's about 2 years old. It turns on and works for a few minutes and then turns off by itself. The red light flashes on and off and there is a greyish screen light that flashes until I disconnect it. The irritating thing is that I already called for TV service and they quoted me approximately 400- 500 for a home repair. I've replaced the power board and main board myself and it worked beautifully for 1 hour! Now it's back to power cycling. Does anyone know what else I can do or replace. It really wasn't difficult at all to change and I don't think I'm paying 400 for someone to do this again. I'm a woman and I only needed help to lay the tv on my bed and I did everything else myself. Help!