Replace Bluetooth Module
I couldn't find the exact procedure for your exact model, but I did find something close in your product Class. The following document is for a Portege R200.
This should walk you through the basic dismantling of the laptop. IT will give general instructions about unscrewing the case, taking out components, removing the keyboard, and getting access to the part of the motherboard that holds the bluetooth module.
You'll know what part to replace as it will look the exact same as the new part that you have. Once you have access to the part, unhook the old antenna and un-clip the old chip from the board. Then just reverse the procedure for the new chip. Read More At : Portege 3500 Tablet PC...