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Background noize, what to do? (hardware)

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JustACat:
I know that it's a RockBox forum, but I have a problem and I don't know where to ask my question...

Yesterday the sound of my DAP (iriver h320) became bad.
It's not clear lika everytime erlier.
I have a background noize with the music especially if I increase the volume.
Also now I have a bad sound like a bass stroke (very loud click) when I plug in or plug out my earphones... Even if the music is stopped...
I check my earphones - they are fine.
And I check this problem on the original iriver firmware - same probmlem.
So I think it's a hardware problem. But what could happen with my DAP?
And what should I do? (The DAP is not on warranty, and I have not a service in my town.)
Maybe I could check something myself?
Give me some advices, please...

threepointone:
chances are that "bass click" is from a voltage offset at the outputs of the iriver. If you can, you should check with a voltmeter--if there's DC from signal to ground more than 30mV or so, it's probably not good for your headphones and you risk damaging them if you use them too long.

I suspect one of the passive components (DC blocking output capacitor, possibly, especially if they used a tantalum) has gone bad. Or maybe one of the ICs died. Unfortunately, either way, I don't know how you could possibly fix it without some electronics / soldering iron experience. . .

Or a better idea, see if the line-out still works.

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