Hello
My first N900 is dead but it could handle ideal settings (power-kernel).
My second N900 cannot even handle lv settings.

Is it possible to dismantle the N900's and build a N900 that could handle ideal settings?

I've already looked at the schematics. I think the power chip is damaged in the first N900.

I've got all the tools I need to dismantle the N900's.

There's a youtube video by tekhseven that demonstrates taking it apart and putting it back together. It did work again after that, but that was only one.