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LG 42L55 intemittent loss of sound

We have an LG 42L55 Smart TV bought in July 2012. From time to time we loose sound- it's not a total loss of sound. If we turn the sound to MAX we can just hear it. Repeatedly turning the TV off /on clears the problem. Any idea what the cause is?

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SOURCE: lg lcd 37 inch tv loosing sound

i have the same problem and find that if i freeze then unfreeze the screen it works

Posted on Mar 20, 2008

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i think your bulb is shot must be replaced

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SOURCE: 2004 GMC Envoy XL Loss of power

I also have an '04 Envoy XL. The problem we had was very similar. The truck lost power and the wife and kids were stuck on the interstate. It was the catalytic converter totally clogged. We were told by our trusted mechanic that we were lucky not to have blown a head gasket from the back pressure. Two days after having the converter replaced the check engine light came on. I went to Autozone to have the codes read. I don't remember the code number but it was basically that the thermostat was stuck open and the engine was running too cool causing it to run rich and clog the converter. I did not get a light until after and the light went out on it's own. I hope this helps you. GOOD LUCK!

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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.

Posted on May 22, 2009

  • 42 Answers

SOURCE: LG rear projection tv. sound but no picture.

Go to a repair centre, some parts must be fixed/replaced.

Posted on Jul 22, 2009

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KV35S42


Classic bad picture tube! End of natural life for that make/Model.

The  current sensing circuit is turning the video on/off.

The orangey look also indicates CRT no good.......T.

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