Remove R5, lower left of CPU make sure these pads clean and smooth/flat and are not shorted etc you will NOT need to save this resistor Prep your solder iron Align ffc with correct pins you can use tape etc to hold it temp Add lots of flux solder bottom pins to bottom ffc contacts while holding ffc in place Add more flux Now you can solder the other pins Add more flux remove bridges Add solder to the 3.3v and G pads on the ffc Solder the 2 wires from ffc panel: It’s ok to pre tin the ends on both wires Solder one from power (B+) on GBA to 3.3v on ffc and then the other wire from and ground (B-) on GBA to G pad on ffc Test with your meter so make sure you have power and ground You should have continuity from the exposed metal of the expansion connector to the g pad solder blob on the ffc and from the 3.3v solder blob to the B+ solder blob.
