Hello guys, got an 820-2936 board here that came in December with no VCORE. I replaced some caps and the board came back to life. Last week the costumer brought the machine back again with no VCORE. I replaced U2800 as sometimes it's the culprit of that kind of problem and checked R7402. Same thing. Sometimes when I heat up U2800 area VCORE comes back for a moment and dies again. I have 12.53V on Pin 2 of R7402, 0.54V on Pin 1 and 3.3V on Pin 2 of U7400, so I have enable signal and have VIN on U7400, but still no brain/vcore. What else can I look?