This is a hard gadget to get apart. However, removing the three posidrive screws (one under a `warranty void if removed' sticker) allows prying the case apart enough to get at the on-off switch. It's a fairly common 3mm square button switch; I replaced it, and the scales work again.
If the power board is OK the power ON light should appear. If you disconnect the harness from power board to mainboard, are the voltages correct? There's a polyfuse in series with the mains input, it could have gone entirely.
Is the laptop totally dead (can you see the splash screen on booting? Does the `charge' lamp light up when it's on AC?) Possibilities I can think of include: --- temporary blowing of a soft fuse becuase of overcurrent drawn from the USB port --- Damage to the power supply I'd try removing the battery and AC, and leaving it for 24 hours, then trying again as a first step, in case it is just a self-healing fuse. If that doesn't work, you're going to have to pull it apart and look for damage on the mother board -- which is a bit of a pain on most laptops, they're not really designed for serviceability.
The charger I tried to fix today had glue over the entire inside of the case, not just along the seam. It was very hard to crack open, and left the metallic shield that here is seen on the inside of the shell glued to the inner metallic case.
The charger I tried to fix today had glue over the entire inside of the case, not just along the seam. It was very hard to crack open, and left the metallic shield that here is seen on the inside of the shell glued to the inner metallic case.