This set may have a bad IHVT (flyback ) transformer. When this goes out it shorts out the horizontal output transistor.
If the horz out tran is good, then check the hi voltage splitter. (Danger! there is 30,000 volts here!) Pull wire from splitter, insulate with a 6" length piece of rubber hose, and turn on set. If sound comes back the splitter is shorted.
Hope this helps,
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We have a bunch of 23" LG units that all failed with the flashing green light problem. I opened it up and traced it to a bad 3.4v output on the power supply which was caused by a puffed up capacitor on the board. If you are capable, you can do the repair and they have all worked fine since. BTW, they ran 24h a day for 2 years before this happened.