The power On is connected directly to the AVILMA power IC. Reconnecting it needs a good soldering techniques and a bit risky for it is the power IC. There is no other option to find another spots where we can apply the jumper wire on it. So proceed with extra care and precautions.
Remove the AVILMA IC carefully without damaging the solder ball bumps pads. The power On OFF button switch two terminals below is connected to the solder ball bumps as shown on the picture, while the other upper terminals is connected to ground.
Nokia 6303c Power ON-OFF Jumper Ways Solution
Download HI-RESOLUTION image.