Introduction
Unit wouldn't power on anymore after 4 years of service, Seems that the power supply is a common failure for this model.
There are two methods to fix sound bar
Tools
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Remove 19 TR15 Torx screws from the rear of the unit and
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Remove 5 TR15 Torx screws from the bottom.
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Remove 2 2.5" Allen Screws
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Remove the Yellow Glue from the underside to remove the power supply from the right side of the rear panel.
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From Here you can either Replace the Power Supply, using compatible components from amazon, or you can try and replace capacitors and see if that fixes the issue.
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Conclusion
To reassemble your device, follow these instructions in reverse order.