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Trintitron were very state of the art when they came out in the 1960s. The Sony company stopped production of the newer version, flat screen in 2008 of the trintitron. Popping noises aren't a good sign. You can try resetting it to factory default settings. Try to have the power on to tv, then, hold down the reset button on the REMOTE CONTROL- next on the tv PRESS THE POWER BUTTON ON=IF AND WHEN THE TV WILL TURN ITSELF OFF AND ON AGAIN, THEN YOU CAN RELEASE THE RESET BUTTON. Unless it This noise is caused by the expansion and contraction of
the cabinet during warm up and cool down of the lamp in the optical
block of the television. This is normal operation. But you having no picture, this could be your power circuit is going out. You can get it fixed, but if it is an older tv you may want to upgrade to an LCD, HD, or even a plasma. They have really nice flat screen HD TV now that are not too expensive. But if you are pleased with this tv it might be worth getting it fixed.
The "popping" sound could be electricity jumping from one place to another.An internal SHORT in a transistor, an internal OPEN in a resistor.Intermittent [sometimes it does,sometimes it dose not] arcing electronic parts. Dust [metal filings,very fine hair that burns like a fuse] & dirt [anything metal], arcing (shorted) capacitors.Bad connections on ANY ground connector. Possible:: your surround sound MASKED the popping sounds by acting like a FILTER.Which lets me to think that your problem is in the audio section.
Has anyone heard of something like this where the cable box/service is causing popping sounds?
yes & it is common problem.
And is this something I should be concerned about causing damage to the TV's speakers?
not at all.
The Sony tech-support representative (over the phone) diagnosed it further to a problem not with the TV but with the cable box/service because there were no popping sounds when I played a DVD on my Playstation 2 that is attached to the TV.
they are right that your problem is not due to tv.
it is due to cable box/service?
but not defective it reqires to change the way you have connected tv to cable.please call tech to get it connected in such a way so that you do not get popping sound when you you put off cable box.
You apparently have a high voltage arc.
Possibly the anode lead to your picture tube.
Also the flyback transformer could be arcing.
If you're not experience with tv repair, you need to have a tech check it for you. The circuits operate at very high voltage and if you get into it you can get a possibly fatal electrical shock.
Be careful !!!