Question about Olevia LT37HVS 37 in. LCD HDTV

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Loud static blasts

Periodically, and for no apparent reason, my 37" Olevia HDTV will emit a LOUD buzz, or static blast (the only way I can describe it). If I am away from the room, I'll have to run back and turn the set off, then turn it back on to stop it. After that, it will usually perform well, however we can't leave the house with the TV on for fear that this frighteningly loud noise may result in an explosion or something worse. It can actually be quite unsettling

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  • stid Apr 15, 2008

    Since I have no external speakers connected to the set, I'm assuming, possibly incorrectly, that the emanate from the internak speakers. When I turn the TV off and immediately turn it back on, it works fine until I finally turn it off for the evening.

  • stid Apr 15, 2008

    I have no idea what a "LOT" unit is.

  • stid Apr 15, 2008

    I am assuming that since the volume of the sound is grossly disproportionate to the prevailing speaker volume at the time, that maybe it isn't being broadcast over the internal speakers.

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The LOT is not working properly...

have you checked that unit??

Posted on Apr 11, 2008

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My FStar TV does the same thing. Functions fine for a few hours and then blasts out a very loud medium to high pitch squeal, sometimes as loud as an air-horn. Happens on all inputs and the sound is far louder than the loudest volume I thought my TV speakers were capable of generating. It lasts about 7 seconds. I also have 7 second periods where there's no volume at all. I think it's a bad power supply or the electrolytic capacitor. As an electrolytic capacitor ages, its capacitance usually decreases and its equivalent series resistance (ESR) usually increases. The capacitance may abnormally degrade to as low as 4% of the original value, as opposed to an expected 50% capacity degradation over the normal life span of the component. When this happens, the capacitors no longer adequately serve their purpose of filtering the direct current voltages on the motherboard, and a result of this failure is an increase in the ripple voltage that the capacitor is supposed to filter out. This results in a system instability.

Posted on Aug 12, 2013

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Yes can you please verify whether its coming from the speakers or not?

Posted on Apr 15, 2008

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Static noise can come from a number of places. The key is to try and find a pattern to when it occurs. Does it only happen after the unit has been on for a while? Is the set still under warranty? DO NOT open it up if the warranty is still valid. Since the problem seems to come and go, it suggests either a heat or connection problem. Given the signal levels inside the set, connection problems can occur and result in many types of problems. Try to post the following info and we should be able to help further:
1) Look for a pattern of when it occurs.
2) Does the set work for a while even right after a power cycle to clear the initial problem or does it occur again right away?

Thanks,
Dan

Posted on Apr 15, 2008

  • ABRsvcs Apr 15, 2008

    Thanks for the update. The next step is to determine whether or not the sound is coming from the speakers. I suspect that it is. Bad coupling capacitors in the audio path can cause this. This is important: is the set under warranty? If so, return it for warranty repair. If not, we'll need to start looking at hte audio path. Are you comfortable working inside the set? Are tyou familiar with electronics?

    Dan

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A sound from your speaker or it was coming from the unit(inside)..?

Posted on Apr 15, 2008

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