MacBook Pro 2009 15"

If yours is the model with removable battery panel on the bottomof the MBP, take the battery out and check the connector on the computer and the battery panel, clean the connector if necessary. Try again and see if that helps.

If this is not the removable model, have it checked by the Apple store genius bar techs to see why the charging circuit is not responding correctly.

Also, is the charger the right model for the MBP? See:http://support.apple.com/kb/HT2346

Ok, you can troubleshoot the MagSafe by following http://support.apple.com/kb/TS1713 but it sounds like the problem is more involved...replacing a logic board and now saying it needs another would point to the charging circuit itself. That is not going to be an easy item to service, a logic board would be easier to do.

Check the MagSafe connector pins and see that all are straight and clean. Try a different charger and see if that changes the behavior. Beyond that having the techs at the genius bar run their advanced diagnostics would be the best source of info.

You might also perform a SMC reset and let the battery charge till it reaches 100%.

http://support.apple.com/kb/ht3964

Ciao.

Should work fine with that charger, but definitely do the SMC as OG says, that often helps...cannot do any harm, either.

That is basically an SMC reset for a MacBook Pro that has a removable battery...the technique in the HT3964 article for the non-removable battery models uses a key stroke combination to bypass the internal battery. So the technique you describe will work as an SMC reset, you do not need to do it that way, i.e., remove the battery.

It is really up to you, but I would do the reset as the article describes and not mess with opening and removing the battery if it isn't necessary. More opportunity to break something.

There is something not communicating between the MagSafe connector and the battery...you might try removing the battery again, check the contacts to see they are clean and reattach to see all is connected properly. Check to see the cabling from the MagSafe port to the logic board is undamaged, and all is attached correctly. If none of that helps, then you need to look into having an Apple tech test the system for you to see where the connections are breakng down.

Been out all day, so getting back a little with this...I am not convinced the issue is with the connector, but if the replacement is easy and cheap, why not go ahead. But since you will have the case all opened up for that, take the time to check out the battery connection, all of the cables, and especially the wiring from the connector to the logic obard and battery. See that everything appears to be connected right as there is something in that circuit path not doing its job.

You are welcome, and here is hoping that clears the problems.