HDMI problems

Check your Advanced Image options on TV & try turning Noise Reduction off, while using HDMI (if Available)... It will sharpen the words on screen & True Motion (User) (Page 69) has a Judder & Blur Adjustment too..

LG Recommends using 1920x1080p for your TV, for best picture quality, while using HDMI.. Frames Per Second (30p) & Hertz (50Hz) are totally different too..

Frames Per Second = How many picture slides make a moving picture & Hertz = The Vertical Refresh rate or cycle of pixels on the screen etc..

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I would also, recommend using a High Speed HDMI 1.4a (3D Supported) cable for your 3D TV..

You will need to buy the official HDMI cable which includes the official HDMI adapter. That will solve your problem.

I have the same problem, but in my case I have two screens (LED manufactured in 2013 and LCD manufactured in 2010) and two xbox 360 (arcade and slim), both xbox are not working if I use HDMI in my LCD screen, but in the LED are working perfect, the only
way to make them work in LCD screen is using the component HD AV Cable. The problem appeared in my xbox 360 arcade when I updated to the 2.0.16197.0 version of dashboard and the slim when I updated to 2.0.16537.0. I tried all the solutions in the faq and help
of xbox site and nothing is working. If someone have any idea about why occur this situation will be appreciated the answer. Thanks in advance.

Hi

I've have the some problem with and LG plasma tv and after hours or research and phone calls to LG which they checked with the same model as mine and it turns out that when the xbox is in any HDMI port and tv is set to that channel all works fine but leave
everything setup and just change the source ie to HDMI port 2 then the signal to the xbox is cut, the xbox thinks the HDMI cable have been pulled, once I and they changed back the channel to the xbox it regained the signal and rebooted.

With the same tv I could play dvd though the xbox over HDMI due to it saying something like secure link not found.

So I was told its was something to do with the TVs HDMI ports and how they are powered and same a conflict with the xbox

Changed telly to Sony and all works fine.

So it could be your TV that is causing it like mine was, used it like that for 2 years then upgraded the TV

That does sound like a setting or sync issue. I'm surprised your monitor doesn't have another audio input if it has VGA. I would check your HDMI audio settings again, and make sure you try both and possibly restart the xbox after switching.