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Don't know which Legrand box you have but your installer is probably not correct. This tv requires fairly precise placement of the in wall concealment box, power cable/outlet, and the signal wires coming out of the wall. Here's a link to last year's template. This years model should be close. https://www.lg.com/us/PDF/Gallery_Series_Mechanical_Drawings_v4.pdf You can find this years version here: https://lgus.csod.com/client/lgus/default.aspx You have to register for a free account to access. A large 12" box is best if you can fit it between the studs. Wires have to be routed inside the channel cutout and cable guides on the back of the TV and each input wire (HDMI 1-4, network and coax) should have a different length protruding from the wall to precisely match the location of the input on the back of the TV. I spent several hours measuring my setup before I called the installer because I knew they wouldn't get it right. If you have the Best Buy SKU:1501144 Legrand box, I would suggest reinstalling with a larger box like the Peerless (BB SKU:2580073) if having the TV totally flat against the wall is important. Still really important to measure the distance for each input cable though and ensure there is just enough protruding from the wall. Power outlet placement is also important but using the Peerless you can mount it facing up in the box. Hope this helps.
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