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Without knowing the specifics on this adapter - I can provide only provide some clues as to how this works.
Basically, the A/V jacks on a TV has a "fixed" audio output level - this means that the sound levels on the A/V jacks is NOT controlled by the volume control of the TV itself. You should be able to set the TV volume to minimum and then use the adapter's volume control to make the earphone / headphone sound louder and softer. Your TV however, may have a setting in the menu that can change the audio from "fixed" to "variable". If set to "variable", when turning the volume down for the TV's built in speakers will also turn the volume down on the A/V jacks as well. You do not want this to work like that as the sound in the headphones and the TV speakers will be same - instead of the TV speakers being off and the headphones on.
I hope this helps and good luck! Please rate my reply. Thanks!
The problem is either from the remote or the television, there has been so much heat on the control panel of the television, so it has melted some lead off a part of the control panel and bridging it to another part, so it is increasing both the volume and changing the channel in an upward direction.
The solution is to change the control panel of the television or correct it by using a soldering iron to melt off the lead from where leads meet.
If you remove the battery from the remote and it still does the same, then it is confirmed that it is the televisions control panel. But if after removing the battery it stops scrolling up, then the problem is from the remote and the solution is for you to replace the remote with a new one.
It is true that you won't start to hear this television's volume increasing until the volume level passes 10. Then it gets louder until the volume level gets to 30 then between 30 and 60 it doesn't get any louder. This is the nature of this particular television. You can go into the audio category of the menu and increase the treble and the bass. Listen to the television with surround on and then off to see which one is louder. Connect the television to a sound bar.
After a television is a year or two old it may start to degrade naturally so you might benefit from being walked through an INIT. Call 877-332-7867 to be walked through one and the television may sound louder after it is complete.
This is due to the signal reception. Some channels are broad casted with strong signal strength. Therefor you will find the audio is louder than other channels.
Also, if there is voltage fluctuation/surges/spikes that is also responsible for suddenly increasing the volume.
Best is to put a voltage stablizer