I can't get the sound to bypass the tv's speakers to my network blu-ray home theater system.

Not all Hdmi cables have same capabilities. Check out:
http://www.hdmi.org/consumer/finding_right_cable.aspx

Run wires from tv audio out to blue ray box aidio in.

You get surround sound only if you hook up your Optical out from your TV to the Optical IN on the HT-H4500 using an optical audio cable. You may have to buy such a cable if one was not included with the TV or the home theater.

Follow the link below and click on the Manual tab.

Samsung Home Theater System HT H4500 Home Audio

change the input settings on the SONY. sometimes there are are HDMI INPUTS AND OUTPUTS on high end systems. Make sure you are in INPUT

did you ever fix this?

What kind of TV do you have?
I have found one of the easiest ways to connect surround system is to connect all your accessories (ie. Wii, Cable Box, VCR, etc) to the TV.

Next find the AUDIO OUT on the TV and connect this to the TV or AUX input on the home theater.

Tune the Home theater to the Input that you connected the TV to. This should play the audio through the home theater for any input you tune the TV to.

Note: make sure to turn the TV volume all the way down otherwise there will be some distortion due to the delay between the TV and the home theater.

Good Luck,
Robert

hi,
Is there is any optical digital output in your satelite HD. Then connect that optical digital output of satelite HD to the optical digital input of your surround system (blue ray player) using an optical cable.
Then press the function button on the remote of surround sound system (blue ray player) and select D.IN. (D.IN means DIGITAL IN). You will get the audio through the surround sound system. if you need any more assistance fell free to contact me through fixya.
ok

LG documentation states:

When you use SIMPLINK function, you have to

connect to the OPTICAL IN 1 jack to enjoy TV
sound to your speaker system.

Basically you need to have the Audio go from TV to receiver and setup receiver to that Input to output surround sound to all speakers.

If you have a cable box or satellite receiver, hook that output into the receivers input and that should work.

My setup is DirectTv HDMI output goes into the LG Home Theater HDMI Input 1, and LG goes HDMI output into the TV HDMI input 1.
so to watch DirectTV, I switch LG Home theater to HDMI Input 1. and TV is on HDMI input 1 (to view LG HDMI output from DriectTV, Blu-Ray, Vudu, etc.)

YOU NEED TO CONNECT OPTICAL CABLE (NOT INCLUDED) TO OPTICAL1 CONNECTION ON YOUR HB405 AND OPTICAL OUT OF YOUR TV. IF YOU ALREADY HAVE DONE THAT TRY PRESSING SIMPLINK BUTTON ON YOUR TV REMOTE NAD CHANGE THE SPEAKER OUTPOUT FROM TV TO HT(HOME THEATER).

Make sure you turn on the surround sound located on your remote, should be second button from the bottom all the way over on the right.