Hiding cables in the wall for a TV installation

This page shows an example of hiding the cables in the wall for a TV installation. The TV is a 50” LG Smart TV, hanging on an Omnimount Play 40 Black TV Bracket from the USA. The bracket which features a gas strut, allows easy movement of the TV in any direction. The wall plate used in this example is a Nexxia NX-WP-157, unique in that it includes power and HDMI within the same wall plate.  HDMI Cables used are the Konig NX-HDMI-742K cables.

Using a 47mm deep back box, the cables can be fed through the existing knock out holes keeping power separate from HDMI or power cables. Here we check the cables once all plugged in will fit into the back box.

The wall plate is positioned where it will clear all movement of the TV bracket and remain out of site. Position chosen was to the left side of the brackets most extreme position.

The wall plate is then slaved into position allowing us to run the cables in the desired position to establish the cable run. It is important to ensure the cable run is laid out with consideration for the able length. Cables cannot be cut to size or made up to any size, so the cable run needs to take account of the two wall plate locations. In this example, the intention is to terminate the cables at both ends but this page will only talk about the wall plate behind the TV.

Once the cables are temporarily taped into position, the cable run can be marked out onto the wall and the cables removed.

The Back box then needs to be sunk into the wall. Once marked out a series of holes are drilled around the outline. This is then completed using a sharp knife to remove the plasterboard. Again a series of holes are drilled into the wall block and a chisel used to removed excess material. Depth must be checked all the wall round to ensure the back box will fit. The bottom edge of the hole is modified to ensure cables clear.


With the back box installed, the cable run can then be cut out. This can be achieved using a sharp knife against a metal edge scoring deeper each time into the plaster board. Eventually a solid strip can be removed exposing a slot for the cables to disappear into.

At the corner, a bowl or round object is used to ensure a consistent cable bend radius rather than a sharp corner.

Once complete, the cables can be connected to the upper wall plate, the wall plate installed into the back box and the cables buried into the slot in the wall. At this point if your customer is watching, you may need to ask them to be patient whilst you complete the task.

Then the filling process can start using a quick drying plaster. Carry out an initial fill to close the hole, wait 24 hours for this to dry and then skim with a final fill. A further 24 hours and this can be painted to match the room colour.

TV installation no cables

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