how do i fix my craig mp3 player headphone jack the left channel is blown?

i tested the phones and usb out . i opened up the case and i noticed the white powder where the middle left metal clip is located has white residue..im guessing this is for the left channel. only the right channel works. i thought it was a contact issue. how do i replace it . is it easy to sodder on a connection to this board ? it is a lower end model craic mp3 player.

The kids have a couple of no-name MP3 players that had similar issues. Once you get them apart and have enough room to work, it takes no time at all to touch up the solder joints. I was able to put enough solder on the suspect joints and then gave the contacts a gentle push inward (from the outside of the jack with a jewelers screwdriver) and problem fixed.

When you go to re-solder the bad joint, make sure you clean it first. That crud can make it hard for the flux to get down to the pads and lands and if it mixes with the solder, you'll just get another bad joint. Take your time, clean it first, use good flux and 60/40 (thereabouts) solder (or a good rosin core solder in place of the flux), a cleaned and tinned tip and you will be fine. If you need to, use a magnifying glass or helping hands. They can really help. When you have finished, check to make sure you don't have any solder bridges. If you do, remove them.

Soldering is a skill that takes some time to master, but you have to start somewhere. This is as good a place as any. AND, fixing something you will use quite often will spur you on to bigger and better projects.