The headphones have stopped working in the left ear. They are jvc ha-v570 headphones. Is there anything i can do?

It's probably a broken wire.

First, make sure it happens with those headphones no matter what you plug them into. If you're using them on your computer, try plugging them into your phone or someone else's computer. If you're using the quarter-inch adapter, try plugging into something that will take the eight-inch plug (the picture I'm seeing of your headphones shows an eighth-inch plug with a quarter-inch adapter). If the problems goes away, then it's either the adapter or the audio jack on the original device. But a new quarter-inch adapter online or at your local Radio Shack. If that doesn't fix it, then the jack on your device is shot, and your best bet is probably to get a new device. (Before I spent the money on a new device, I'd borrow another set of headphones, just to be sure that the problem persists no matter what headphones you use.) If the device is a computer, then you can buy a USB sound card (which plugs into a USB port and has mike and headphone jacks on the other end) instead of replacing the whole computer.

But it's more likely that the problem will persist no matter what you plug into, and it's your headphones. It's probably a broken wire; sometimes if you jiggle the wires going into the dead earpiece, you'll get crackling to confirm this diagnosis. But it doesn't really matter why the headphones don't work; no matter what's broken, the repair is more expensive than replacement. Time for new headphones.

The above answer assumes that you are listening to a stereo sound source. In addition to trying your headphones on another device, you should make sure you're listening to a stereo sound.

CHECK YOUR LOCAL CRAIGSLIST, EBAY, OR AMAZON. THEY SELL HEADPHONES THAT EITHER ARE FOR PARTS OR HAVE BOTH CUSHIONS AND BEING IN WORKING ORDER.

I ALSO SUGGEST FOR YOU TO CHECK:
http://www.jvc.com
OR
SEARCH GOOGLE BY INSERTING THE FOLLOWING WITHIN THE SEARCH BAR: " BUY CHEAP HEADPHONE CUSHION FOR AN; HA NC100 SET OF HEADPHONES"

IN YAHOO SEARCH BAR YOU CAN TYPE:
" DOES ANYONE KNOW WHERE I CAN BY AN HEADPHONE CUSHION FOR JVC HA NC 100 HEADPHONES,
OR
DOES ANYONE GOT A SET OF JVC HA NC100 HEADPHONES FOR SALE THAT MAY BE USED FOR PARTS OR EQUIPPED WITH BOTH CUSHIONS THAT ARE IN PROPER WORKING CONDITION?"

I ALSO SUGGEST TO CHECK www.overstock.com

The JVC HA-NC250s are a new version of their previous model 100, and JVC claims that they will cancel up to 85% of ambient noise, coupled with better sound. In this case, JVC claims up to 16.5 db reduction at 150 kHz. These on-the-ear headphones are very lightweight at 5.3 ounces and are extremely comfortable. The head band has a reasonable amount of sliding expansion for bigger heads, and the oblong ear pieces themselves rotate and fold flat for storage. JVC uses memory foam on the earpieces, as well as double housing, for extra noise isolation. The earpieces have 40 mm neodymium drivers, which are the same size and type that the Creative Aurvanas offer.The JVC HA-NC250 noise canceling headphones. Note the ear-cushion instruction tab that explains how to replace the hidden battery.

The NC250s come in a semi-rigid black case with a dual airline-plug adapter, a mini-to-RCA phono plug adapter and a 4' detachable headphone cord. JVC includes one AAA battery, which should last approximately 50 hours. A simple sliding switch on the right side turns the noise reduction on along with a small red LED. Learning how to add the battery to the headphones required that I study JVC's user manual. The process involves having to remove the earpiece covering to get to the battery compartment, which isn't at all obvious.

Wires connected wrongly. Unsolder and switch the wires the other way round.

http://www.jntworld.com/catalog/index.php?cPath=21_1002&currency=gbp&osCsid=c5b2f0de48c59564afb36dfebba513ac#tabbed_box_1

Try here

these things are suppost to have a little static noise when on. next time get noise reduction headphones. they are like headphone style ear protection like what construction workers use. but only more stylish and they contain speakers. and no killing batteries for good sound. they are regular headphones but with really good sound isolation

You might want to check out my tip on dealing with dodgy plugs/cable on headphones.

It may be the plug end and not the ear piece itself. Usually the problem is the plug, rather than the phones themselves.

Maplin might have some universal type ones. You could also salvage some of a cheaper brand new type, if you can find one the same size as the JVC.

Remove the ear pad on the Left ear which has the power switch on,
The remove the 4 screws, then there are two silver screws holding the outer cover in place, remove these and then tae the cover off.
You will see there are two AA Ni-Cd batteries inside these can be replaced ith any rechargable batteries you wish