Samsung qn55

Jones2109

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I have a Samsung QN55LST7TAF that stopped working after 8 months. Since it was installed in a commercial setting, Samsung invalidated the warranty so the customer had to replace with a new unit. I checked the main power board and it had a blown fuse so I replaced. When plugged in, the fans now come on and I have a single green led flashing on the main board. When I press the power button, I get a single red led flash on the button but no activity on the screen. The TV does show up on my Samsung hub so there is some life on the main board. Should I replace the led driver board or the main board next?
 

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