I got a GT and found during the recap process that the negative pad for capacitor CC703 was destroyed by either corrosion, me, or both. Below is an image from the retrosix.wiki showing exactly what went wrong. The area circled in red is completely gone and the area in yellow has been lifted up but is still hanging by a thread. I'm terrible at reading schematics but it looks like this pad needs to connect to two different areas on the board. One is a larger ground area, possibly, and the other is a pin on the 6280 chip.
I tried to replace the caps using the SMD kit but I think that may have been a mistake. I suspect I will need one or more wires to connect to the ground plane (if that term is correct) and also the 6280 pin. If I do wire it, my first guess is something like this, one color per wire, going straight to the negative side of the cap:
I'm new to this type of repair and I'd appreciate some advice so I don't mess this up any more. All the other caps have been replaced and currently the system powers on and goes to a white screen. Prior to the recap, games did boot every 3rd or 4th try and the screen was very dim and flickered and sound was extremely low. The screen also didn't respond much to the contrast wheel. Now the screen is very bright and responds well to the contrast wheel, but I have no sound either from speaker or headphone port and games clearly aren't booting.
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