Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
SOURCE: lg plasma
there are 2 types of flicker, one is the lamps that drive the display and the second is the sync signal of the video.
I assume the video sync is the flicker you see,
I would try connecting a different way to make sure it is not the tv,
connect using the aux /rca connectors to cable box.
and or connect using the cable direct bypassing the cable box.
I have seen several complaints about the hdmi cable signal being incorrect in some way,
this is the same issue that the svideo connector had in its early adoption signal was too hot or too low.
another thing to watch out for is the low light sensor on the front of tv if it gets an incorrect reading it can flicker the back light though it should be slow in doing so.
some times the flicker you see is not flicker but ac running through the sides of the picture from an ungrounded cable source.
how does it perform if you play a dvd player , with and without the cable box connected.
SOURCE: LG 32LC2D Power light Blinks but set will not power on.
change your adc(analog to digital converter) board will help out
SOURCE: (Built in) TV GUIDE Screen is black except for small channel preview window on top-left.
After purchasing a "service remote" and then buying a new "Main Board-Analog" which didn't fix the problem, I spoke with tech support who then emailed me an "EPK" file. Basically the computer board inside the television needed to be updated since this whole digital conversion is happening.. However this incident has given me tremendous knowledge of what to do and how to troubleshoot and how to reset my own TV with all the hidden menus that you never knew you had. Don't be tricked into buying a mainboard or even paying a diagnostic fee. If your TV GUIDE screen goes blank and all you see is a small channel preview screen in the top left corner, chances are all you need is the EPK file update. I received the update file in my email, I downloaded it to an SD card, inserted the SD card into my 32LX1D LG LCD TV and it did the rest. It was too easy. Most newer LG TV's are coming with a "SERVICE USB" so you can attach a "jumpdrive" or some other storage to it. These so called "Authorized Service Centers" are a hoax. WHen you bring your TV into them they charge you a "diagnostic fee" ranging from $50-$150 just to diagnose it, then they tell you that that can also be applied to the cost of the repair. All the service center does is call a special priviledged tech support 800# for LG to find out what to do. I've replaced and removed my own Main board. You gotta learn the game people, its all a big game to keep the revenue coming long after the sale of the TV. Which is why nowadays automobiles are manufactured with parts that were made to break intentionally to keep bringing you back.
SOURCE: My 32" LG takes about 3hrs to get a picture when turned on
Most likely you have capacitors in the power supply that have dried out or as we say vented. If your handy and want to replace the power supply I suggest " Shopjimmy.com ". If not, then take into your local service center for an estimate first.
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