You say it works ok but when the volume is low it hums. This could happen if the volume is set too high on one of the equipment. Either the sound bar or the tv. Try turning both to low, then just turn up the sound bar volume. See if the humming goes away.
Confusing question. You say it works and then it hums? Can you rewrite your question.
SOURCE: Vizio Sound Problem
I've seen the same problem, went thought a couple of cable boxes. Turned out to be an AC line problem. Try plugging the TV into a different out, maybe in another part of the house.
SOURCE: New Samsung Tv High pitched hum
Don't know if people are still having this issue or not but figured I'd post what i went through to help anyone that has. My LN-T3253H tv as out of warranty when I finally got around to calling Samsung. They flat out lied about the commonality of this problem and I convinced them to at least pay for any parts. Problem is the labor of a technician would be around $150. So, I bought the new power supply from Partstore.com for around $70. Just go to partstore.com and enter your model number and look for the power supply on the page. It took 3 days to get the part. It was very easy to replace. All you have to do take off the back cover of the tv (think there were around 12 screws all around the outside and one where the A/V connections are and pull off. Unhook the plugs going to the power supply and the four screws holding the board and then replace with the new board. So far, this fixed the issue. Keep your old board in case it starts happening again. You can probably have the old board repaired to fix the original problem since so many TV repair shops are aware of the issue. I am trying to find out from someone which specific capacitor or other piece is causing the issue and plan on fixing it myself. If and when I do, I will also post that.
Make sure you give Samsung a ton of grief when you speak to them and see if they lie to you also. I had just bought two of the new Samsung LED TV's for my media room. They work great but I returned both because of Samsung's refusal to fix my LN-T3253H and I will never, ever buy Samsung products again.
SOURCE: Polaroid FLM-323B LCD TV with no sound
Just finished reading other posts. Solution that has fixed my problem. Unplug power cord for 1/2 hour. Now, I have sound. That explains why my sound came back the last time. Not Global Vol. Unlock!
SOURCE: Audio problem Westinghouse 26 inch LCD
seems to be related to the backlight setting. If the backlight is less than full - i hear a humm/whine thru the speakers.
Design flaw!
SOURCE: Audio Out Fixed/Variable
Is your subwoofer amplified or passive?
You clearly understand that you need to use a variable line out to control the subwoofer volume via the TV. As the setup seems reasonable, I'm wondering if the subwoofer is getting a signal, but that it is at line-level and not internally amplified by the subwoofer speaker. Generally, if the subwoofer must be plugged into an AC socket in the wall, it has an internal amplifier and can be fed line-level audio. If it is "passive", it has no amplifier, and it must receive an amplified signal (over speaker wire) from an amplifier (or integrated receiver). TV's don't generally have connections to send out an amplified signal.
If the subwoofer is indeed amplified, then this is obviously not the problem, but it's the first thing to verify given the information provided.
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