Harmon kardon 745 displays "unlock" no sound for tv or movies

That's because you have connected another device in HDMI1, the TV detects it as power on, and then change HDMI2 to HDMI1.

Try to power off the device in hdmi1, or you can even try to change HDMI2 to HDMI1 port ;)

Have you tried to unplug you tv from the outlet for like 10-20 mins?

hey, when connect any aerial in the back of the TV make sure you have a look for the name of the connection you use ( Skart,ext1,ext2,usb,hdmi1, hdmi2 etc.) so you can do a search on that extension. if you connect something on Hdmi1 and search on hdmi2 you won't find anything. you have to search on Hdmi1. PS: good luck.

Did you keep the manual? Start over at the beginning. Digital optical audio cables are usually redundant if you have HDMI.

When power on and input set to hdmi1, there is no image appears

you need a usb memory stick with your movie etc in divx or mpeg format obviously plugged into usb port. You then need to select your input device by pressing AV button on remote control a few times and it'll go through TV,SCART, AV,DVB-T,HDMI1,HDMI2,EXT,USB

You need to change via tv selections option for tv, this should be possible by selecting the source for tv feed. This should give various options to select hdmi11, hdmi12, scart1 ect. If remote not working to change look on the tv itself for the control buttons, normally on the back to 1 side (rh from front) then pressing the correct button. If this does not work try turning power off to tv for a couple of minutes and then turning back on. Hope this helps.

you need a fibre optical cable for this, simply you connect that from your dvd to tv and then set the input on the dvd to digi in. i have exactly same home cinema system.

What model TV do you have?

First of all connect the Direct TV box to HDMI 2 and see if it works there. If it does then the next step is to connect the DVD player to HDMI and see if it wors there. If not then connect the DVD player to the TV using the component inputs and if the DVD player works on those. If it does then maybe the HDMI interface in the DVD player no longer works as it needs to communicate with the TV.