3GS not charging / recognized even after dock assembly and other replacements

Hello all,

I've replaced the dock assembly to a new one and I noticed that my 3GS is not charging since then...
And when connecting to PC, I get the "USB Device not recognized" error!

I've tried the following:

• Replacement of battery (just to watch it dry out again)
• Replacement to the original dock assembly
• Tried another USB Cable
• Tried another Wall Charger

I've also noticed that the little gold pin of the main board broke off... But it has nothing to do with it right?

I'm supposing it is a main board issue... But what can I do? Is there anything on the main board to fix?

I'm without a phone now... I wanted to fix this really hard...

Thank you in advance!


Luis