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I would suspect a problem with either the inverter circuit, or 24vdc circuit. I would start with checking the power supply capacitors. Look for any with bulging tops. Research shows your set is from the 2008 era, many sets from that time were built with cheap Taiwanese capacitors. I've repaired quite a few of the older LG LCD with your same problem. They all had faulty capacitors in the power supply.
Do you have audio and if so can you change channels to hear other programs? If so ...you have a bad vertical IC. Have a tech turn up the screen control to see a white horizontal line. By your question I would say this will correct the problem.
i know your problem. its an inverter loose connection from CCFL to inverter output. back of your LCD inside the TV. try to remove and re-connect again. be sure no power and AC is unplugged. firstname.lastname@example.org
If your tv is flashing 7 times.
Disconect audio module. It is on top of power supply. Turn tv on you
will have picture. Conect the audio
outout from the rear. To the aux.
input of a stereo. Where you night
control audio level. Or get a new
audio board. Its is very expensive
get only the audio amp I. C. The audio.
part. No. 1-866-539-11
the light engine is defective and needs to be changed..this set is not that old..contact mitsubishi customer relations to see about having it done under a customer accomodation, as they have had a lot of problems with the engines