SOURCE: no hdmi sound from macbook pro to toshiba 40E210U
I was having this exact problem. You have to go to the "Audio MIDI setup" icon in the utilities folder. plugin your mac to the HDMI and TV and it should show up on the menu bar on the left as "HDMI"- then click it. then you have to click on the "format" drop down menu and change it to either 48000.0Hz or less. Make sure that the volume is down on your TV bc I almost gave myself a heart attack when I clicked it. Apparently the TV HDMI input is not compatible with the default on the Mac. Hope this helps!
SOURCE: my toshiba 40e210u lcd tv won't show full image on screen
The Aspect ratio of the TV could be on the wrong setting for the image you are trying to view. Widescreen's standard ratio is 16:9 ensure the TV is not set to zoom, 4:3, or pan & scan in the picture menu of your TV.
If the picture looks normal except it's just missing the edges or looks squashed or looks like it is zoomed in from the normal image then aspect ratio is probably the cause.
I would start with having the power supply checked. If the power supply is in good working order, I would then suspect the main board.
SOURCE: How do I setup philips sound bar htl4115b to a toshiba tv 40e210u
It is much easier it you use a Optic cable because this is how you receive digital audio. Are you using a cable box that has HD? Are you using DirecTv or DishNetwork?
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