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Main system control memory IC fault. This is a very small IC; have 8 solder terminals, and can be located very near to the main system control-chroma IC. Check and replace it. Be sure to replace it with the same number printed on it; in all respect. Otherwise, it won't go. http://electronicshelponline.blogspot.com/ Before replacing it, try a reset to this set, and then check.
There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here.
Bill, The 50H7GB's smart features are based on the Opera OS. Hisense uses an Opera-based platform for its connected features the same system/browser you'll find on Nintendo's DS and Wii video game systems.Check the attached links,instruction and guides, Good luck.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." Hisense H7GB2 4K Ultra HD Smart TV Review 50H7GB2 55H7B2 65H7B2 Hisense 50H7GB Hisense The H7 4K Ultra HD TV
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