Logic Board overheats. Tried Everything :( iPhone 4s

Hello there :)

I have an iphone 4s logic board which overheats. It was intermittent at 1st which let me to believe it was water damaged (corrosion over time).

I scrubbed it with 99% but still it overheats.

The phone is fine when off but when switched on quickly heats up (til overheat pop up) and the battery depletes very quickly.

I have a working 4s shell (my own iphone), and have just hot swapped the boards over so this is, as far as I know, only a board issue. I have another original battery and both are fine.

Any suggestions to whats up ? Or what to do next ?

Photo supplied points to what heats up. http://img827.imageshack.us/img827/9...logicboard.jpg

Thanks :)

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