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you eather have a bad solder connection or a part overheating...this unit has a processor that generate error codes that technician with a special computer interface can read....this is where the troubleshooting begins...first thing a tech can do is check make sure all cables are securely plug in
The beeping sound is most likely the high voltage generator needing replacement. This is a fairly easy job if you have some tech support to discharge the picture tube. You can go to the following link and leave them an email with your model number and your symptom and they will email you back with the part you need and they provide free tech support with instant messageing so you can do the repair yourself. the HV generator takes about a half hr to replace and takes only the basic soldering ability. heres the link. http://servicemanuals.vstore.ca/
proabably it,s because you left it on for long time , or the image power saver is wrecked and damaged after a storng lightinning , and if you have cleaned ther tv screen with a wet wiper it causes that to happen
This indicates a problem in the power supply either the low voltage switching supply or the High voltage power supply. The sounds you hear is the shutdown circuit activating, I would not suggest that you try to repair this problem because of the dangers involved. I would suggest that you take it to a qualified TV repair shop. This problem should not cost you much, however it is the best choice for the problem you described.