Rear Speakers no Sound.

Check where wiring plugs into receiver

I had the same problem. You must turn on the remote speakers via the reciever and then adjust the remote speaker volume control that is only located on the remote control. The volume buttons are on the top right of the remote. It is briefly discussed in the owners manual which can be downloaded online.<!-- from fixya rte -->

are you sure you have them plugged into the main speaker (Front) not speaker B? or make sure you dont have speaker B turned on only.

The chances are that you have selected an incorrect sound setting or not switched it on, for the HDMI you are using. With Onkyo receivers each connection will have it own settings for video and sound. You just need to look in the manual as to how to select the settings.

Hello, I am sorry for your issue. Please go to replacementremotes.com and search txsv525. They do sell a replacement. If you email me at [email protected] and I will send you a copy of the manual. Thank you. Onkyo USA

Assuming you do have all 5.1 speakers connected and a digital signal (DVD/CD etc)
Make sure that you have the surround speakers connected into the right spot on the rear of the amp: they can be confusing with their markings.
Front speakers should be in speaker A front.
You must have the sound setting or sound programme on Dolby Digital or similar, Not just stereo. There should be a dial or button on the front panel for this.
Bear in mind that the rears are the only for effect and do not alway produce sound.
Maybe send me more info:

Hello, I am sorry about your issue. I suggest that you contact Onkyo product support at 800-229-1687 option #3 so that we can troubleshoot with you. Thank you, Onkyo USA.

when the stereo or mono listening mode is selected only front speaker and subwoofer produce sound--------make sure that speakers are configured correctly.
and you select surround sound in listening mode.

I just connected the front main speakers and sound well, but when i connect the speakers (2 fr, 2 rear, 1 ctr) there`s no sound in any surround mode from any source.

So your saying that you have no rear channel. Some recivers use a single stereo output ic for both sides on the rear speakers. you could have a defect with this IC . Anther thing Im sure you check3ed the obvious ie : the switch is on suround sound? If there is a front to rear fader is it in the middle? Good Luck