Your best chances of repair are if you contact Sony and ask them.
If This problem is only happening when you use the headphones on one device such as an iPod, the circuit in the device may be damaged. I won't get too involved into how to fix this, though.
But if Sony won't help, your warranty is out on them, your device you are using if not the problem, and you need them badly, I may have a fix:
Open up the earphone that is malfunctioning
check the solder connections that connect the wire to the speaker
if they connections are loose, you have two options:
buy new headphones
OR
If you can solder, Connect and solder the correct leads to the corresponding places.
If the solder connections are fine, check and see if the wire is frayed or damaged anywhere.
If it is, you have two options:
buy new headphones
OR
salvage an old headphone's speaker wire from somewhere else and try to remove the old wire and use the salvaged one to replace it. (this will require that you are quite good at soldering.).
If only a small part is damaged, try and use a smallpiece of the salvaged wire and splice it into the old wire. If the wire is very small, I recommend that you just buy a new pair of headphones.
if you can find out if the speaker is blown out or has ripped itself, you can try this trick I learned in MAKE magazine:
Get a bottle of rubber cement
very very very carefully apply a few thin layers of rubber cement to the ripped or torn area. You might wait for the glue to dry and then reapply. Make sure that if you do do this, you do not over do the rubber cement. Otherwise, the speaker will just sit there and be "frozen".
If you have access to an oscilloscope and know how to use one, you might try to probe around in the circuit and see if you can find interference anywhere that is causing the problem.
Buy new earphones. (just joking) Try whacking it with a table. It works.
SwagSWAGSWAG
There are many places where one could purchase mp3 earphones online. One could check online shopping websites such as Amazon or eBay for purchasing mp3 earphones.
You don't try to fix it, you get a new one.
One can buy wireless earphones from stores like Best Buy, Future Shop, Target and many more. One can also buy wireless earphones from sites like eBay or Amazon.
SlankIT
Turn it back.
some earphones are mono and some are stereo. check that your buying the correct one first. if earplug have problem ,please use tool test it,example:mp3,use it test every one plug parts.my web:www.esshop.cn
One is able to purchase JVC earphones at several different online locations and retail websites such as on the following websites: Amazon, JCV, and eBay.
You can get Shure e2c sound isolating earphones from your local electrical or computing stockist. Failing that, you can try sites such as Amazon or eBay.
Estimate Front one side $380.00 Estimate Rear one side disc brakes $285.00
One can purchase iPod shuffle earphones from a number of locations. Large retail stores such as Wal Mart and Target will carry this product. Additionally, they can be purchased online from sites such as Amazon and eBay.
this is a blown bulb on the right side usually one that flashes
I think one of the effective way is that you can first explore some information online, do some research and comparison about the prices of earphones. http://www.dinodirect.com/iPod-Accessories/iPod-Earphones, here will help you know some situation of the earphones.