Top left – Two HDMI inputs, both are HDMI 2.0 with HDCP 2.2 copy protection. Some projectors with two HDMIs still have one of them the older HDMI 1.4 which cannot support 4K HDR content, etc. Better to have two current ones. (HDMI 2.1 now exists, but very few products are using it yet.)
Directly below them are a pair of USB 2.0 inputs for the media player, and other uses, including providing power.
To the immediate right of those four inputs is a single USB 3.0 input. That is far faster and more capable than the HDMI 2.0 ones. Having one helps future proof the LG.
Further to the right is a normal (TOSLink) Optical Digital Audio Output. This output provides the highest quality audio to your external sound system, etc. And, as an added bonus, you can specify the HU85LA to output via this “TOSLink” connector, while the internal speakers are playing. This will allow, for example, a simple way to hook up a properly equipped powered subwoofer, to provide good bass to help out the internal speakers with some respectable bass.
The menus let you activate this Optical digital audio out, to work with the internal speakers, or of course you can opt to turn off the internal ones, and go full range though a sound system that accepts the TOSLink or Bluetooth.
Ethernet – a typical RJ45 network connector is the next connector over.
Finally, on the far right of the panel, is a coaxial input for the TV tuner. That could be a signal from a rooftop or in-room antenna or hook up the coaxial output of a cable or satellite box that has one. Note that the internal tuner does have a limited number of channels – all the usual UHF and VHF. Don’t start thinking you can use the internal tuner to watch the hundreds of cable channels, say, that a cable box provides, by using the internal tuner.
Almost done: There’s the AC power receptacle on the lower left, and right next to it, the usual Kensington Lock security slot.
One more item: I barely discovered it.
There’s a Power button! Or, rather a power Joystick. If you are facing the front of the projector it is located underneath the front right corner. It’s not far (but to the right) of the LED light in the lower right of the front grill.
The LG’s joystick lets you power on (press the center), power off: Press and hold.
Left and right will let you lower/raise the volume, while moving the joystick “up and down” (toward the back and front), will change channels.