After fixing three different mp3-players with the same problem I’m starting to see a pattern of bad soldering on the connections for the ear phones plug. Fortunately the fix is easy if you have a basic knowledge about soldering.
I’ll go into detail for how I solved the problem with a SanDisk 1GB, MP3-Player (model number: SanDisk SDMX1-1024R).
Before you begin, remember that if you have warranty for your product try to get it replaced before. This fix will void your warranty!
Start by removing the three screws as in image 1 and 2.
Then you remove the plastic shields on both sides as in image 3. This was a bit tricky, but if you are careful and try to lift it up in one side you should be fine.
Image 4 and 5 shows how it should look once the shields are removed.
Then you lift up the plastic body on one side, this was also a bit tricky, so be careful! Image 6 shows what it should look like.
Remove the ”main board” as in Image 7.
Then you remove the card that holds the ear phones plug by lifting it. Image 8 shows the ear phones card removed.
I could then see the bad soldering on the connector for the ear phones plug and I replaced that. Once I was confident that my new soldering was good I put the mp3-player together again and it worked.