The laptop should recognize the tv. first you need to power off laptop completely(shut it down, don't do a restart). plug hdmi to tv then turn on tv. power up pc and it should recognize your tv. Use projector mode if available on your pc. don't unplug cable while computer is on or the process will need to be repeated.
Try function f4 several times
SOURCE: cant get sound via hdmi connection from acer 6920g laptop
go into control pannel and acer hd set it there and also in sound, a wee bit of trial and error but its there. mine was the same, it cost me ouch on the phone! good luck mine works ok
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