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If you can't find the manual for your Toshiba, it is at http://tacp.toshiba.com/tacpassets-images/models/65H85C/docs/65h85c_om_e.pdf
On page 57, it says how to turn off the built-in speakers: you do it with the Toshiba remote. I tried to copy the simple directions, but it is a pdf document, so I can't. However, this is intended to connect the Toshiba to an external audio system-- do you have a receiver or amplifier? you would use this to turn off the Toshiba speakers and use your Logitech speakers connected to either your amplifier, or your DVD. Do you have cable, and would like to hear the sound through the Logitech and not your Toshiba speakers? You can do that from the diagrams in the manual on how to set up your Toshiba with a DVD, Cable, and/or VCR, pretty clear in the Manual.
However, It turns out that your Toshiba has a setting to create a surround sound effect which is rather remarkable, and may actually sound better than your Logitech speakers, which are on the low end of quality. You have to turn it on--see page 55 of the manual--called WOW, from SRS Technologies. It works! you turn it on using your remote. I could find no other easy way to turn off the Toshiba speakers and play the sound through Logitech connected to your Toshiba with the possible exception of turning the Toshiba speakers off, and the Toshiba audio out on, and connecting your logitech to the audio out--but that is a bit consusing, for it is designed to use with the Picture in Picture system. Definitely try the WOW system first, then compare it to the Logitech connected to your DVD or cable box/amplifier.
A good review of the Logitech and its connections is found at
http://techgage.com/article/logitech_x-540_51_speakers/ Let me know what happens!