Sennheiser HD 205 Headphones. My cable has had its fair share of pulls and tugs over time and finally the left ear stop working. By fiddling with the cable i was able to get sound from the left ear, but only intermittently. So Iv'e striped off the rubber cable to have a look. the red wire looks fine so im guessing thats for right ear/ the blue wire and one of the cooper wires are frayed however. the 'thread like' inner cotton wire seems intact but the blue wire around it is frayed. Now im not very technical but i was wondering if i can fix this myself by soldering or if the cable will need to be replaced? Thanks in advance for any help. Ian.

If you click my user name you will find a tip about headphones. It might be able to answer the problem.

If you click my user name you will find a tip about headphones that might be able to help you.

you need to open it carfully and see if cables or one cable or broken
If the one cable its broken you need to solder it the speaker

The two copper wires on your headphones are independent grounds for each channel. Twist them together and attach them to the ground cable ( black) of the new plug. The colored wires of the headphone correspond to the live wires of each channel, and the plug should have the same colors. Wiring together the grounds will not affect in any way the stereo separation, it is just that each ear needs its own ground. Cheaper headsets just transfer the ground from one ear to the other one through the metal headband.

The ear padding is attached to and held in place by a plastic ring that fits into the speaker mount. Gently pull the ear padding outward so you can see the ring, then slip a flathead screwdriver or other object in (just a bit, you don't want to poke the speaker inside). Gently pry up , sliding your pry-bar along, and the pad should pop out quite easily.

the problem is the cable from one driver to the other suffers from fatigue due to the bending of the plastic frame as the headphone fits to your head, causing copper cables to disintegrate.

the solution is to take apart the headphones (mini and regular Phillips screwdriver ONLY required) and solder a new cable in. in my case i used a standard coaxial cable for replacement.

once you have split the end of the senheiser cable output from cup 1 into its two parts you need to attach it to the equivalent connections on cup 2 (which u also need to split, i suggest using a modeling knife)

the red wire is insulated with ceramic coating much the same way as an electromagnet winding, the other is standard copper. you must attach copper to copper red to red with YOUR OWN cable.

the most difficult part is removing the ceramic insulation coating on the red wire, which i removed with a blast from a cigarette lighter. simple.

problem is your cable probably will not fit in the slot designed for the previous cable so i drilled a small hole in the BACK of the cup (silver colored horse shoe shape) and ran the cable outside the plastic case. not pretty but it saved me £40 for 2 hours work, which is not bad.

i am a trained mechanical and electrical engineer so u can trust.

They're very easy to open. You can pull the outer pads off by squeezing them at the bottom edge.
Inside, you can prize the speaker plate off the white plastic body with your fingers, and access the connectors if you need to.
The headphones all just clip back together.
Mine just stopped working in the right ear. I fixed them in about five minutes.

Go inside and test the speaker with a small low power battery, connect it quickly (just a quick touch) to the terminals of the speaker, it should pop! If it doesn't it's gone.
If the Sennheiser don't have replacements, then it's bin time!

Try this link:http://www.metacafe.com/watch/1045725/how_to_solder_how_to_repair_headphones/