Displays of laptop and tv goes off after a bit when connected together via hdmi?

Ok so I have just downloaded drivers for my laptop manually to enable me to connect my tv via hdmi (this wasn't possible without these drivers for some reason-i had no signal on tv). While I was connected I was watching a program and halfway through the tv went blank then the laptop went blank but the laptop was still running. However, I got the laptop back on (it actually resumed ecerything back to normal). So it connected tp tv again but very soon after (5mins) the same thing happened again! I decided to watch the show on my small laptop screen alone and it didn't go off. Why is this happening when connected to it. The resolution was 1336x768ish. Is that too high? Or is it power saving? I doubt it though as power saving is on balanced with no limitations. What can it be?

-graphics - nvidia geforce g 105m. -laptop- HP Pavilion dv3-2130ea. TV LG 32 inch LED (32le4500). Thanks