Hello. Im getting the common error 7 code on the MPU system 9 board. I changed out and re soldered new u19 and u20 sockets AND also changed out the u19 and u20 chips with brand new ones. I am still getting error code 7! Game GI turns on but that's it! From what I read what was fixed should have solved the problem. What am I missing or what should I check next? Kind of out of answers. Thanks for the help.

Update on my Error Code 7 that is apparently resolved. The u17 socket needed replacing that has the MPU chip. Bad connection. Push down on the top right corner of the chip and error goes back to 0 and game is in attract mode. Stop pressing on it and error code 7 comes back and game does not work. So I will monitor it for awhile but hopefully that fixed the problem for good.