Sound not working right - Protron PLTV-32 Television

Go to "menu/Setup/Speaker level" and adjust the balance of L-R.See page 21 of the manual:
http://usa.yamaha.com/products/audio-visual/av-receivers-amps/rx/rx-v540/?mode=model

Sounds like you may have a problem with the wires themselves. Perhaps you could sacrifice just a little integrity (literally not enough to notice) by simply tying into the center speaker with the right front wires. That way, at least they're all working.

YOU HAVE TWO HORNS , ONE ON THE LEFT FRONT , THE LEFT ONE SOUNDS FOR YOUR ALARM. tHE RIGHT ONE AND THE LEFT SOUND SOUND WHEN YOU HONK YOU HORN. uNPLUG THE RIGHT HORN AND THE LEFT WILL WORK. REMOVE AND CLEAN THE RIGHT HORN AND IT MIGHT WORK OR REPLACE IT. i THINK THEY GET WATER IN THEM,

Reconnect all the wirings of the speaker set. Left and Right sound connectors from the subwoofer properly.

Do you have the manual if not go here.
http://www.hammerwall.com/Manuals/Pioneer/Description/VSX-D608/Pioneer%20Home%20AV%20Receiver/L0020200/

It could be that every sound has its recording style, some record the sound to just left or right only(mono left or mono right) some has stereo, recorded on left and right. Some have induced additional sound that only surround sound is best at.

Or some base on signal strength, some cut or boost only to the level it is set to appear.

1ST.-The right jack could be damaged!!
Usually, there is a [+} posaitve & [-] negative input\output to speaker connections. Not all [-]neg. is ground.Sometimes the [+] pos. is grounded. [The exception to the rule is that u SEE the black wire going to ground] the reason I am letting u know this is that u can test the INSIDES of the sound system.
If u can get inside of the unit. Cut the left speaker output [+] posative from both outputs. criss\cross wires.Place left speaker output to right speaker jack[ that does not work!!] & visa versa.If the [LEFT Output] stops working after u plug in the speakers,the internal RIGHT output is damaged. NEEDS TO BE TESTED
If nothing nothing changes.The left still works & the right still does not work, then it is the jack (shorted ?, opened internally ?)

Unless your using the Optical and Coxal input you wont get 5.1 surround sound.

it is highly likely that you're TV is outputting mono sound, hence the left channel only. check your physical connections to the TV and the balance / channel volume on the television as well.

You need to use a digital interface cable between the sound card and the speakers to get all of the 6 channels to work properly.