The back light ballasts are going bad. Some models combine them with the power supply board. You can get parts from here: http://www.shopjimmy.ccom/
SOURCE: LG 50PX1D 50 in. Plasma TV
i just had the same problem. after talking to many tv repair people i finally got a knowledgeable person to help me. i ordered the part and fixed it myself.
it was very easy. i have an LG model# 50px1d. so if you had this problem i suggest you order the part yourself and fix it. i got an estimate for repair and it wouldv'e cost me at least $500 parts and labor. i paid $230 for the part. so you can see i saved a little more than half. the part you need is the " Z SUS " ASSEMBLY. you can order the part from LG website. the part # is 6871QZH044C.
let's just say after doing everything myself, i am watching TV right now.
by the way LG would not help me at all. spread the word that LG is not a good product.
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: LG 50inch Plasma received loud sound then went black
My friend's LG 50" plasma tv has the same problem and it cannot light up. The picture and sound are working fine. But the brightness is too low. It is purchased 2006 too and out of warranty. So I opeend up and found 9 capacitors 3300uF 10V on the power module at the middle of TV are popped. I am planing to replace all of them. They are available at digikey.com. I think this model's power module has design flaw. The cap rating may to low. 10V? Stay tune to see what happen after I change the all the caps.
SOURCE: LG LCD flickers and turns itself off
It seen to me you are having a power supply problem, you can get a replacement for about $50 on eBay. If you have basic electronics training Check for bulged caregulatory & regulator
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