I have a Q900 8k TV(model#QN55Q900RBFXZA),
I was watching TV one day and it suddenly turned off then I tried to turn it back on and it wouldn't. The stand by light is on so I'm not sure if its due to bad cable(invisible cable),the OC box or possibly the TV. I've tried unplugging it from the wall waiting then plugging it back in, and tried turning the tv on with and without the remote both dont work. Has this happened to anyone or does anyone have any suggestions or any advice?
Unplug the TV for 30 seconds.
Try to update the software.
Disable the Power On with Mobile option.
This type of issue will need to be addressed by having the unit serviced. If the unit is in/out of warranty you can use the following link to find a list of service centers near you that can do the repair: http://www.samsung.com/us/support/service/location.