First you may want to go to the TV's menu and select the input to which you have plugged in the HDMI cable.
Second, on the laptop you will have to press a key combination to change the display from the built-in LCD screen to the external output.
It is
Fn + F5 on most Toshibas, you will have to look for a function key with an icon symbolizing a internal/external screen like this:
It works like a 3-way toggle; when you hold the Fn key and press F5 repeatedly it circles through the following options:
- internal LCD only
- internal LCD + external monitor (both)
- external monitor only
If you want to see the picture on the LCD as well, you have to stop at the "both" option, but the resolution will be limited to the one of your laptop screen.
If you want to use the full resolution of the TV (like Full-HD) you need to stop at the "external" only and adjust your laptop display settings to optimum/maximum resolution for your TV.
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