Re: Sony Pyxis IPS-360 GPS receiver !1991)
Remove the antanna and undo the screws on AA-battery cover and remove the rubber seal on edge revealed 4 screws, remove screws. The front will come off and remove the four screws on the display circuit board, Lift the display board and then remove the four screws on the main circuit board. Edge out the board from the case taking care of the rubber seals. On the reverse side of the main circuit board is a daughter board that has the lithium battery this needs to be de-soldered and replaced.
EDIT: Ruddorthner, welcome to iboats! I kinda doubt the original poster is still waiting for an answer to his question 6 years later so I'm going to lock this thread -ezmobee