Samsung led tv power cycle on and off? - Samsung UN55EH6000FXZA 55-INCH 1080P LED BACKLIT HIGH DEFINITION TV
Televison & Video - Samsung - LE - UN55EH6000FXZA 55-INCH 1080P LED BACKLIT HIGH DEFINITION TV
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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. 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; visit the site linked here.
I did unplug the TV power code more than 1 hour with the status of 'TV on.' Anyway it works, so far so good. I don't know whether unplugging still works with 'TV off' status.
Note 1: Even I bought the power supply board bn44-00499a from Amazon (TVchopshop) to no avail. I returned it. So, try unplugging first!
Note 2: According to Google, Chromecast (CC) also seems making power cycling bugs. So, I unplugged CC also.
In addition, open the tv back cover and disconnect/connect 2 flat pin connectors to the power board, another guy suggested.