The main speakers don't work. Headphone jacks work but if you unplug the headphones there is no sound

When you plug in the headphones, the jack itself routes the signal away from the speakers. When you unplug the headphones, the jack has contacts that close again, routing signal to the speakers. If the jack contacts are dirty, they won't close correctly. I suspect were you to clean the contacts, you'd solve the problem.

Try inserting a headphone plug into the headphone jack and remove it. Sometimes these units have a problem in the headphone jack where the unit thinks there are headphones plugged in even when there isn't. This cuts all the audio output to the speaker jacks. If you never plan on using the headphone jack, you can also go inside of unit and unplug the cable that goes to the headphone jack board. Just make sure you unplug the unit before you do this, the plug is close to the main power switch.

If the headphone jack socket works the audio output for the set is good, I suspect a dvd etc will also work if connected to the rear input audio and video jacks.

This does not leave too much, headphone jack dirty or defective, speakers for whatever reason are switched to off in the main menu.

the sound for the headphone socket if it is built into the set is the same audio going to the speakers.

the headphone socket acts as a switch for main audio and headphone line. either u have a defective socket or the power amp is defective. headphone line is driven by a preamp, which is working - if power amp is defective- headphone works but power amp fails. try changing the headphone socket first. 

check first you headphone jack speaker. if its working well, then the line from phone jack male to speaker continuity.

had same problem with my denon 1910 .... clicking with no sound and some modes indicating not available. Blowing the dust out of the headphone jack solved the problem !!!!!!!!!!!!! ... the denon people could not even figure it out. Thanks sooooo much.

The bypass switch in the headphone jack is likely broken. NEVER unplug the headphones while the amp is on.

There are certain small amps that have a possibilty of popping the power amp due to a feedback arrangement. Likewise, never use the headphone jack for ANYTHING other than headphones.

Your system is designed to interrupt the signal flow once headphones are attached. It can not be changed without internal modifications. There is no control to do this.

Dan

wireless speakers will usually hook to speaker outputs as well as headphone jacks. hook the wireless speakers up to speakers "b".