Unless the system has some kind of automatic volume control on it, that can only be adjusted by the remote. I think you might have a faulty volume/tone control circuit. These days many amps have a single IC that will control the volume. If that goes the volume can get stuck on one level. Since the control knob you are turning is simply sending a signal to that IC. So if the IC has died the signal is not being received.
If you want to repair it yourself just follow the wires back to the board from the volume control. You should see a large multi pin black box that if your lucky is marked on the board volume control.
SOURCE: Surround sound problems.
Dolby 5.1 is not supported via either of the Aux inputs. Be sure to check your main menu/audio setup screen to ensure that "stereo" is not selected. If it is, DVD's will not downmix, giving you only 2.1 stereo.
SOURCE: home theatre problems sound
Did you try to connect AUDIO OUT from your TV to AUDIO IN on your package?
SOURCE: Home theatre but TV without audio outlet
I would suggest that you smash
Philips HTS w/a hammer!
I had better sound from TV alone! Only 2 speakers put out sound from TV. Recordings from DVR can not be heard very well w/all volumes at max. System sucks! You get what you pay for! $2500 LCD TV sounds worse w/Philips HTS than my son's $300 TV! ALL cables hooked up as instucted!!!!
SOURCE: Philips HTS3455/98 System "NO SOUND" PlZ Help!!
There are two capacitors on the power board that are 470uf/35v. go to Radioshack and buy two catalog #272-1030 470uf/35v radial lead capacitors. if you have soldering wick and a soldering iron, then this will cost you under $3.00. when you remove them, the capacitors have a white strip with a negative sign on it. match this up with the shaded area on the board. put it back together, and it will work, and last a long time. I have this same system, and it wouldn't play any sound. so, I replaced the capacitors. Hope this helps!
SOURCE: volume
I had this problem and checked the main wire going from console to bass unit, it was loose from where I had moved the unit to insert another device (RCA Jacks). Apparently if the wire from the unit is loose, it over - rides the volume and by default adjusts it to 30. Additionally, I reset the system console and bass unit console, during this process. Try this, it might fix your problem.
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