An HDMI cable can transmit both high-definition video and audio at the same time. This makes it well suitable for connecting to an outdoor mounted television since the fewer connections being run outside, the better. Running an HDMI cable outside the home into the backyard or onto the patio requires protecting the cable from the elements. A PVC panel cut at a hardware store along with a few tools from a hardware store will provide what is needed. Some supplies from an electronics store will also be needed. The procedure is straightforward and does not violate any zoning laws that might be in effect.
Plug one end of an HDMI cable into the HDMI output on the back of a video source--for example, a Blu-ray player, or the video output on the back of an audio amplifier.
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Run the HDMI cable along the baseboard until you reach the door leading to the backyard. Drill a hole through the side of the door with the portable drill.
Measure the distance between the patio or backyard door to the outdoor mounted TV. Have a length of flat panel weatherproof PVC cut to the length measured at a hardware store.
Place the HDMI extender module next to the hole. Plug the end of the HDMI cable into the HDMI extender module. Plug the module's power supply into a wall socket for power. Plug an end of the other HDMI cable into the other connection on the HDMI extender cable. Push the free end of the HDMI cable through the hole.
Place the PVC flat panel on the patio floor or, if there is no patio, on the ground. Line up one end of the panel with the hole that was just drilled. Line up the other end of the panel with the bottom of the outdoor mounted TV.
Run the HDMI cable along the length of the PVC. Push the HDMI cable into the slit in the top of the panel until it is inside. Turn the panel over. Pull the HDMI cable's end out of the end of the panel. Insert the HDMI plug into the HDMI connector on the outdoor mounted TV.
Apply silicone paste to the inside and outside of the hole to protect the wall from the elements. Staple the HDMI cable inside the house to the baseboard with the "U" clamp nails from the nail gun.