If the Logitech Pulse 475 is the same as the Labtech Pulse 475 then the left channel amplifier probably blew. The Labtec uses a 5 pin TDA2030A, which costs around $3. You will need to know how to solder to repair this. The back of the case comes off by removing the 8 screws around the back of the case and lifting it out by the power cord. Then, simply desolder the left channel amplifier marked IC201 (it's on the leftmost side of the board, next to the volume potentiometer) and solder the new amplifier in it's place.
This is a product defect. Logitech knows about it and wounldn't replace my speakers. It's in the remote volume control. There defective part is the volume control variable resistor and they know. Very expensive speakers that I shouldn't be throwing out becuase of a defective part. NEVER BUYING A LOGITECH PRODUCT AGAIN!!!!
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Can you swap the left and right speakers to isolate the speaker from the source as the problem?
Have you tried switching the various plugs around to isolate if anything comes out to the Left Channel, ever or if any other speaker plugged in as the Left works at all? Turn the volume down and bring it up slowly at first because if you send Subwoofer programming to a speaker not designed for it you may damage it.
If nothing works when plugged in as the Left speaker, maybe the sound card is the problem. Resubmit a question with the source or the PC as the problem
Can I assume the calibration procedure also didn't work for the Front left channel? (It's not a "surround" if it's in the front). Switch the receiver to Stereo mode to eliminate any DSP actions. Tune an FM station to eliminate any external device or cable issues. What do you hear from the two Front speakers?
OK? Select a DSP surround mode. Check all modes. What happens?
If the channel goes dead using some or all DSP modes there's probably something wrong with the processor. If they all work...
Isolate the source that exhibits the problem.
It was a bad left channel cable somewhere, wasn't it?
I figured this one out, although I might still send it back for an exchange. It turned out that the right rear speaker works just fine, however the jack seems to be flawed. When fully plugged in, the rear speaker input only picks up the left channel. If you pull it out just a little, say 1/8-1/4 the way out it will pick up both channels. Not a good solution but it works for the time being.
The headphone is tapped before the final stage of the amp, so knowing that those work properly helps to isolate the problem. I think that this model uses an IC for the voltage amp section prior to the final amp stage. That being said, the IC is probably an UPC2598 (if memory serves). I'll confirm tonight. Try resoldering any connections that appear to be grainy or have rings. Let me know what you find.
This is going to have to be a solution in the works...so don't rate until we have some kind of end-result.
Connect the speakers to a different device such as an MP3 player or a Nintendo DS. See if the speakers still cease to work. If they work just fine with a different device, then consider that it may not be the speakers...but a problem with the sound system in your PC.
Perhaps the sound configuration in Windows is disrupted. Perhaps the driver settings for your soundcard in your PC are corrupted. (A complete reinstallation of Windows with a fresh installation of the sound drivers would probably prove this theory right or wrong.)
Perhaps there is a problem with the FRONT CHANNEL hole on the sound system on the rear of your PC. You could check that by plugging the REAR channel of the speakers into the FRONT channel on the PC.
And lastly...there could be a break or a short in the cable of the speakers. You could always test another set of speakers with each sound channel and see if that might be the possible issue.
If the sound card in the PC turns out to be the problem, then install a different sound card. If the soundcard in your PC is currently the onboard one, then disable it in the BIOS before installing the new card.
Let us hear the results before we do any rating. Unless of course you're able to fix it with the data given. :)
Sounds as if it's time for a shop visit, unless you want to try this yourself. The panel connection on the rear of the receiver, or the protection relay have apparently come loose from the circuit board. It happens sometimes when stress causes the cabling to pull on the back of the unit..accordianman