Strange, I could swear that I have, already, answered to your post, few days ago. Nevermind - it seems that you have located the chip itself.

Using kernel-power charging module (see BME Replacement thread), you can "force" dedicated charging (aka, the one that would work if you connect charger with data pins shorted) via writeable sysvs node. Search the BME Replacement documentation for thing that you can set values of "auto", "dedicated", etc (sorry, don't remember them right now from top of my head).

If that won't make your device charging, then nothing short of hardware repairing some unknown part will help. Which is the thing that I expect, if you're not charging, even by a little bit, when connected to PC. It's very strange (and fortunate, for you) that USB data functionality is working.

As for trying "dedicated" - just don't try it while connected to PC, only with dedicated charger. In the unlikely case that it actually start *working*, you may end up with your OS (on the PC side) shouting at you and enabling overcurrent protection in the best case, or blown fuse on PC's motherboard (in the worst). PC can give up to 500 mA, and in "dedicated" mode, N900 tries to suck as much as possible up to 900 mA (1250 mA, if manually increased, which is preferable for dual-cell setups).

/Estel