UN50ES6820 UN50ES6820F UN50ES6820FXZC
This TV turned on with backlight but no video. Usual suspect in this case is the tcon board though a bad main board could also cause no video. If I had sound, it would strengthen the case for the main board to be good.
The model appeared to be Canada only and there was a lot of variation in the model numbers for the ES series. Tcon part number was 35-D076725 and main board was BN94-05874R (BN97-06430L firmware).
Replacing the tcon brought the video back. I did notice the volume had been lowered to 0 which was the reason there was no sound. In this model, there is a sound effect if you scroll through the menu.
This model does have backlight issues so make sure they aren’t set to maximum or the picture mode set to Dynamic.