Sansa e250 headphone jack loose

[Lionel Hutz]

Hi,

recently the left channel of my e250 stoped working and I had to wiggle my headphone plug around to hear stereo sound again. I read its a common problem (esp. with the Sansa players) and figured one of the 3 soldering points were loose. However when I opened the player not only the solder was broken but the whole contact had come of the board. The headphonejack is now completly seperated from the rest of the player. Here's a picture I took of my Sansa where I marked the detached parts:



Anyway, I believe I fixed the soldering part but I was unable to reattach the copper contact to the mainboard again. I tried to temporarily wrap tin foil around it or put some graphite on there but it doesn't work. Does any1 know how these copper contacts are connected to the board? I'ed reckon they are glued somehow but it needs to be some conductive glue, right?
 
Sorry, Im no electronics expert so any help would be appreciated.

Thx in advance.

[Chronon]

I'm a bit confused at what the trouble is.  Is the board damaged or are you just having trouble soldering the bits in the red squares back together?

[soap]

If his problem is like others I have seen the entire contact pad has delaminated from the board.  I know of no other fix than finding the origin of the trace and replacing it with a wire.
A higher res. photo would help.

[Lionel Hutz]

If his problem is like others I have seen the entire contact pad has delaminated from the board.  I know of no other fix than finding the origin of the trace and replacing it with a wire.
A higher res. photo would help.

Thats exactly what I tried to explain. Here's a higher res photo of the issue.

As you can see I've scraped the contact pad of because I thought it might help with the conductivity. Before it looked oxidized but now its shiny again.

Im not quite sure what you mean with "finding the origin of the trace". Does that mean that not the whole square on the board where the pad was situated is conductive but only a small piece in it?

Im sorry but English isn't my mother tounge.

[Chronon]

The audio jack will have three contacts V_left, V_right and Ground.  You should be able to trace where this originates from by following traces on the board.  You should be able to figure out which contact delaminated by looking at which part of the TRS connector it is supposed to connect to.  Just by looking at it I will guess that it's the ground contact that delaminated.  That will be convenient since there's often a ground plane in printed circuit boards -- i.e. you should be able to find plenty of places to tap into ground.

[MajiKool Dragonâ„¢]

the exact same thing happened to my c250.
that why i no longer use it.
though i don't know if its the same contact that broke.

[dreamlayers]

The pad that ripped off seems pretty obvious: it just connects to the nearby surface mount resistor (just left of it in the closeup, sansacloseupcm8.jpg). 

I wonder if something else is broken however.  In Sansa.jpg (the first image) I see what looks like it might be a piece of copper above the board.  In the closeup, I also see a raised circle around the ripped off pad and a suspicious bit on the trace below the pad, which might be corroded, perhaps even totally.

In any case, you replace broken connections with solder and short thin wires and glue stuff with non-conductive glue.  I would probably also epoxy the jack to the board to relieve stress on the connections.

[Chronon]

dreamlayers: you have good eyes.  I see the circular raised bit and agree that corrosion is a good candidate to explain that.