In the US you can head to www.samsungparts.com for a service manual. As you are a TV tech you know how hard it is to work a repair without this.
So I have a 55 inch led 3D tv. My house was hit by lighting and it travelled through the cable line into the house. It took out my cable box, modem, and the tv. Roughly troubleshooting the tv I was able to narrow it down to what I thought was the main board being shot due to the red power light still staying on. I replaced the main board with a refurbished one and now the screen will come on for a few seconds and then shut back off. I don't have much experience with electronics. Any suggestions?

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