New MBP logic board and wireless internet does not work anymore

hi there
i had to change the logic board in my only 2 years old MBP15". i purchased a new one and put it in by myself (relatively easy task). i still use the same internal HD as this one still works fine, so all data are the same.
however, the new logic board has obviously a different "identity" from my old one, it came with a sticker which says "ethernet ID 001FF3513E7A" which is different from before. this may be the reason i can still access my wireless network at home, but the self assigned IP address prevents me from connecting to the internet. all settings are as before and it worked always without a problem.
all settings were "automatic" before (using DHCP), and i use exactly the same settings again, but no success. i have to add that i use a new mac mini in the same network with absolutely identical settings (automatic) and this one receives a free IP address from the router (which is only in the last number different from the router's), but the MBP shows a totally different IP address.
i could finally fix it switching to "manual" and adding the same IP address the mini is using and just changed the last number, which has to be different from the time capsule i use as wireless device and the mini. like this everything works just fine.
but why does the mac mini perform everything automatic and the MBP (even with the new ethernet ID - and especially since i connect wireless and not using ethernet) is not able to do so?
i worry if i want to use the internet in any wifi hot spot i may run into troubles...
any idea what the difference between these two machines (with identical settings) is?
thanks and cheers
george

Thank you. It didn't work unfortunately :((
Here are my router's details (Huawei):
Product name HG655b
Device ID 00E0FC-21530307237S0B028701
Hardware version VER.C
Firmware version V100R001C02B018
Batch number RWC3P0.010.29066
Physical address 5C:4C:A9:A5:41:B0
System up time 0 days 0 hours 15 minutes 56 seconds
I don't have Mac filtering enabled.
Now it doesn't even find the wireless network anymore...
My computer and itouch are connected to WAP, but the iphone could not connect to WAP, but only WEP.
Any other ideas?
Thanks a lot!

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