8

Looking at the pictures on iFixit, the two PCBs that fit behind the shoulder buttons don't seem to be reinforced by anything much: Excess pressure on the shoulder buttons might bend these boards slightly away and cause the connection to not be made. The alternative is corrosion on the connection traces; you say you have tried contact cleaner. Try bending ...


5

A bit of googling finds that SMC is "Standard Microsystems Corporation", apparently got renamed at one time to SMSC and finally to "Microchip". The FDC37C654 is a Super-I/O chip with a floppy disk controller, hard disk controller, two serial ports, and a parallel port. The datasheet can be found e.g. here from this page (not sure how ...


2

This card is a low-cost model. The PCB is actually designed to take the more modern FDC37C666 chip, but on the card shown in the original post, the older (but mostly compatible) FDC37C654 is equipped instead. The two jumpers labelled FDD (JP5 and JP6) are most likely: FACF - pin 26 - not a configuration pin on the '654. Position doesn't matter FDCCF - pin ...


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