Describe your Onkyo TX-SR875 7.1 Channels Receiver Problem All right channels are not working. Left channels including center channel speaker is working. Please advise.

Hi, Are all of the left side speakers out? If they are the receiver would need to be serviced. Thank you, Onkyo USA

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http://www.retrevo.com/support/Onkyo-TX-SR701-Receivers-manual/id/365ag222/t/2/

7.1 would have Surround Back L and R.

6.1 would have just one back there (SB). It defaults to the Left output on the Pre-Outs if you ever go that route.

This being a 6.1 receiver it does not support two SB channels BUT you can configure those amp channels for a separate Zone supporting 2 speakers. Confused?

The manual shows a single SB speaker connected to the left side on Page 27. THAT would be consistent with a 6.1 configuration.

Hello,
In reality the correct way to listen to radio or any music source for that matter is in 2 channel stereo. What this means is that the front left and right will play and also the subwoofer. If you absolutely want all your speakers to play while listening to fm, than press the Multi channel button and set it to direct, or any other sound field that you may desire.
Good Luck

IF and only if, your receiver has connections labeled as "pre-out" can it be connected to an external amplifier.

If it does, then you connect from the left and right channels from the receiver, to the left and right channel on the amplifier.

Enter the menu for speaker levels, and increase the center channel.

I would be checking the set up mode , you might have it set to left or right channel only , but in mono mode both speakers will come on through one channel

You didn't state it but I assume the other channels are functional?
The auxilliary channels are generally lower power and may even be serviced by a different voltage than the main amps. If it is so designed, you may have something as simple as a blown fuse for the main amp supply.
If the aux. channels are equal in power, the power supply may still be dividing the load so a fuse still could be at fault. The unit could also use integrated power amplifiers in which case, if two channels are operating from a single module it could be a module failure.
I don't see much chance of anyone repairing this system without examining it in the first person. 

did you swap the left from speaker with the left front?
if still crackels after that them you have bad left output.

get a new receiver

I just read over the problem you were having with your Onkyo TX-SR500 receiver. It sound like the unit needs to be setup for all five channels.Sence your symptom says the diplay shows Dolby D3/2.1. According to the owners manual with the remote control look for speaker setup whin the button is pressed the current speaker setup will be shown in the display. Press the preset/adjustment<> to change the current setting to five speakers. the listening mode will automatically change according to the number of channels you selected. Hope this helps. Radiotech