Here's what we know: Cable box (cox) and hdmi cable are good (i.e., we can plug into another TV and get a picture); hdmi ports on LG tv are good (getting signal from dvd); we've reset the tv to original settings, powered up both tv and cable box multiple times. Worked for two years, then just stopped.
Looking around I find that LG is known for this type of break. Unplug TV for 30-45 min, plug back in. The key is to discharge TV by doing so. I would bet that this is a design flaw or hardware anomaly. If this is the case, buy another TV and expect to get 4 years max out of it... Crappy manufacturing and design is most likely the culprit.
SOURCE: LG t.v is saying no signal on the screen for the cable box and a dvd player.
if the sky box is not registered with your viewing card, it will not show. if you want to check that the monitor is working plug in a dvd to make sure its not the monitor that is at fault.
SOURCE: Unable to display HDMI Input
Okay so you have the HDMI cables from both the DVD and the Cable box plugged into the reveiver?
SOURCE: Low volume on LG HDTV
I encountered the same thing using the HDMI interface on my new TWC cable box (Motorola DCX-3200). After a little bit of research, I finally fixed it by changing the digital audio mode in the cable box using this procedure:
1. Be sure the TV is on and connected to the cable box.
2. Using the cable box remote turn power OFF.
3. Immediately press the MENU key on the remote. The USER SETTINGS menu should appear on the TV screen.
4. Select the ADDITIONAL HDMI SETTINGS >>> menu item.
5. The ADDITIONAL HDMI SETTINGS menu will appear.
6. Scroll to the AUDIO OUTPUT item and select this.
7. Change the setting from AUTO to L-PCM.
8. Return to the main page
9. Using the remote, cycle power OFF.
10. When the cable box is turned on again, you should be good to go.
I realize these instructions are specific to the DCX-3200, but there may be a similar setup option available in your cable box as well.
The problem here is that the cable box is by default configured to use Dolby Digital audio, which requires an additional 10dB of headroom to deal with the boosted LFE channel. If the cable operator hasn't taken pains to set the system up correctly (and most haven't, apparently), the digital audio level sent on the HDMI interface will be approximately 11dB down from normal analog line levels on the HDTV channels. Changing to straight linear PCM sets the TV receiver audio level on the HDTV channels to match the levels on the non-HD channels.
The only problem with this fix is that if you intend to feed a Home Theater receiver that uses Dolby Digital processing with the cable box output you will lose the Dolby encoding feature and be forced into straight 2-channel stereo. For a simple installation like mine where I'm just feeding the TV, this fix works fine. If you have a more complex setup that takes advantage of Dolby Digital features (when it's available in program material), you may have to live with the problem.
For a technical reference on why this happens, see http://www.megahz.com/specimages/Dolby/LM100%20Cable%20App%20Note%2011-05.pdf
Hope this is useful.
SOURCE: "No signal" sign on TV screen using HDMI selector
it sounds like a refresh issue, double check you selector and make sure it fits the refresh of the tv. i had this once with a sharp where the tv was 120hz and the selector was 60 and it created a no signal and when it did come in it was jumpy. if you have a 120 tv then selector should be the same.
SOURCE: I have an LG 47
Tries reset the tv and cable box,by unplug,replug both devices about an hour later.Let the cable boot up and update it softwares.Goto tv Menu goto PICTURE,go down to reset.The Tuner board it reseting to the Factory setting.The HDMI hubs,should all works now.Not than,the tv Tuner board have problems,must be change.Tries Shopjimmy.com,Ebay.com to buy a refurbish a Tuner board for the replacement.
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