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1. Disconnect the cable between the main power supply & main board, supply AC to the TV, if the LED strips are OK, it should light UP, if not replaced all of the LED strips.
2. If the back lights light up, but no display or sound, replaced the main board.(after you re-connect cable).
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Since your TV was struck by lighting, the power supply is the first board that gets affected by the sudden change in AC power.. The main board is the next board due to the fragile components and the excess of voltage that is supplied to it when the lighting happened. Since you have replaced the power supply already.. I would suggest to replace the main board and that should restore the functionality on your TV.
Almost always, the power supply board will need to be replaced after a lightning hit. If the cable or antenna input was hit, you will need to replace the main board also. It is usually cheaper to replace the TV than to repair a lightning hit.
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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/ It will be best to replace the power supply regulator board as card basis.
Model E601iA3 Ser# lftrnwan4225167
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