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No, this is not the power board- when the set only displays the LG logo and then cycles back to the LG logo again- meaning it does not bootup past the logo, this indicates the Mainboard is faulty. The Mainboard is the board that processes external AV signals and also houses all of the HDMI and AV ports on the back of the set. This is the part that needs to be replaced.
The mainboard for your set is available at the link below for purchase:
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