If he created a short, it must be on the logic board. He resoldered the J4 socket on the Analog board, which is far away from the mouse connector.
The only thing I can think of is a power issue: if the mouse gets no power, then it won't move where the clicker is just a contact that needs no power to operate.
Do you measure 5 volts between pins 1 and 2 ?
Without replacement parts issues like this are very hard to troubleshoot. If you had another 128K/512K/Plus logic board or mouse, the cause would have been easy to find.
If the mouse gets power and doesn't work, then the mouse''s PCB if faulty or the VIA on the logic board that processes the mouse's signals.
The only thing I can think of is a power issue: if the mouse gets no power, then it won't move where the clicker is just a contact that needs no power to operate.
Do you measure 5 volts between pins 1 and 2 ?
Without replacement parts issues like this are very hard to troubleshoot. If you had another 128K/512K/Plus logic board or mouse, the cause would have been easy to find.
If the mouse gets power and doesn't work, then the mouse''s PCB if faulty or the VIA on the logic board that processes the mouse's signals.