Please help. My pc does not display on hdmi sony bravia tv but display on another smaller tv.. The cables are tested on 3 diff

Check the specs of the TV to make sure that the video resolution of the PC is not greater than the TV.
Try a different HDMI input on the TV.
Try a different HDMI cable. Even if the cable worked on other TVs it still might not work on all TVs. HDMI is tricky that way.