Re: JVC LT-26X506 - A fairly loud, high-pitched hum from both speakers of the set even when it's muted and disconnected from the HD cable box. The tv is about 3.5 years old and did not make this noise until after our last relocation 3 months ago. Could the mover's (mis-)handling of the set have caused this, or is the problem due to a faulty/aged component?
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Oct 3, 2009 - 30 posts - 7 authors
Its so high pitched that some people can barely hear it, but I guess I have sensitive hearing. ... Anyway, this seems to be a fairly common issue and it is caused by either the ... You're probably hearing a transformer humming.
The mechanism need work and so bringing it to a tape deck repair shop is the only answer if you want it to work again. Check the reputation of the place you take it to on the internet- a lot of places charge money but never fix the unit.
Based on what you have tried if a buzz or loud static via the speakers you have something wrong in the audio output circuit of the set--problem here is that circuit may be part of the Main board that processes all signal---a look inside---following the speaker leads back would lead you to that board.
A simple thing to do to narrow it a little (you may have done this) is with sound all the way off put your ear to the internal speaker--hear anything at all like a deep hum?
Depending on age of set and cost of the board likely bad it may or may not be a do it yourself repair.
go to control panel
sound and audio devices
under voice recording clk volume and mute the mic phone...........
some how your mic is conflicting with speakers. Keep your mic away from your speakers..
Right-click on the speaker icon in the lower right of your screen and choose Open Volume Control and check all volume levels (make sure they are not set to high). If this doesnt work then when you right-click, choose Adjust Audio Properties and search around for volume controls (maybe try the Speaker Volume button).
There is a standby indication that activates after 10-15 minutes without any input signal. I suspect that might be what the red light is telling you - no signal.
Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.
Avoid manipulating cable connections with the Sub or Receiver turned on as you could introduce a static spike that could harm any connected equipment.
Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.
Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.
>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<
A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.
For hum problems, even those you cause yourself:
Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.
Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.