Introduction
If you have already tried a different power cord it is possible your internal power adapter is broken. Follow these steps to replace this part of your soundbar.
Tools
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            To begin, remove the 8 screws locating on the back of the soundbar. These can be removed with the ifixit screwdriver equipped with a Phillips' head in size J1. 
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            The cover will lift up, but there will be wires underneath connected to the cover that need to be unscrewed. This will be shown in the next step. 
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            The 8 screws on the back cover, as well as the screws removed in the following steps, are all the exact same length (approx. 1 centimeter). Keep track of all screws but do not worry if they become mixed up. 
 
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            Underneath the back cover, there will be two flat panels, each with two 1cm screws. 
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            Remove the two screws using the Phillips #1 screwdriver. Once they are unscrewed, the panels will hang loose allowing unobstructed access to the motherboard. 
 
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            To detach the cables grab the internal power adapter in one hand and with the other grab the base of the wires and firmly pull them straight out from the device. 
 
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To reassemble your device, follow these instructions in reverse order.
2 comments
where do you get the motherboard for this soundbar?
Tim -
Where do we get replacement part?