When it freezes, are you able to get back to the dashboard? If you are then it's more likely a laser problem. If you cannot get back to the dashboard, it means that the rrod or E74 is around the corner. You'll need a reflow or reball to remedy this problem.
This is an issue most likely with the GPU having cold solder joints. Try the hybrid advanced kit: http://xbox-experts.com/tutorial/team-hybrids-ultimate-xclamp-fix-released/
Go to the section for the homemade version. For the bolts, you can use #10-32 5/8" (standard) flathead machine screws...
I'm just saying that unless you used thermocouples, you don't know how hot the board actually got. You may have your heatgun set to 300C, but the board could have been at 180C, 200C, etc.
It's fine, you didn't hit any copper. Check out how badly scratched this GPU is and it still works:
In fact, the board actually has a ripped solder pad on the lower left side. I soldered a magnet wire to the matching location on the GPU before reballing it. Then soldered it to the trace...
It can also be a solder ball or group of solder balls under the GPU that isn't touching the motherboard. It can also be a partially dead GPU (0020, 0022, 0102, E74, E73 can all also be partially dead GPU).
When you heatgunned it, did you use a thermocouple to monitor the temperature? Also...
I was in the process of trying to figure out what was wrong with his nandflasher (if that were the issue). I'd be able to fix it since I do, in fact, build them.
I just had to set the facts straight. It's all good.
Comrade, either AIM me (MrPure3d2) or if you use irc, get in efnet and join...
Facepalm? Nandpro gives an error message. I was asking him which error message was being thrown. All of the other programs use Nandpro.
It just doesn't say cannot read. It would say cannot read block # something one time, a few times or for every single block.
If Nandpro says it no flash...
What's the exact error message? Does it say can't detect flash controller or do you get some sort of error about the USB device not being found? I build those programmers, btw lol.
A lot of these youtube fixes end up with people destroying their board. By the time you buy all the proper equipment, you could have gotten it fixed by someone else for way less.
E73 can also be a partially dead GPU which needs to be replaced. If this console hasn't been worked on by others...
Use a reflow station and a preheater (not a griddle). Are you using thermocouples to monitor the temperature? If not, how do you know you're reaching 230C (lead-free solder liquid state). Without thermocouples, you're reflowing blind or not reflowing.