Semi good news, followed your directions roughly used a penny to help spead the heat, 2 actually, unfortunetly the flux I picked up was a paste, so I dissolved the most I could in some polypropanol,
It actually seemed to work, as the tiniest bit of heat evaporated the alcohol, and left the flux as residue.... Now it ran ok in just a quick test, booted up, etc, never had a display attached.
But now I attached it to my TV downstairs after all of this green lights, boots up, I popped a game in then fiddled with the TV to get the right signal showing up. During this I missed the visuals of the launch and menu, unfortunetly, because what I saw when I get it was a crazy amount of artifacting, so I shut it off and tried to restart, 3RROD again, new code this time. 0020, so about to go look that up.
Mistakes I could have made Flux is still under the second RAM chip and not melted, not sure if I melted the first one enough, I stopped when I saw this flood of liquid spill out from under the RAM chip.
Re: 0020, sounds like a RAM error and seems right up there with Artifacts, so not sure if it is because of the cold solder being broken on the first one, or if it is flux bridging a solder on the second one x.x going to have to give her a blow again, just scared of melting the IC's