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R5400 has been replaced initially, would make sense to replace U5400. i dont have U5400 from 3023 donor board in-stock. Can i use one from 3435 donor board?
found a small green shit on u5400. so i've replaced.
AXG sensor is fixed.
i bet its SMC, i need to replace. reflowed but no change.
VP0R will be corrosion on Q5300.
VC1R is not common, measure on R5320. Check in hardware profile to see what the limits of the sensor are, will give a clue as where to look.
What is the actual VP0R voltage when measured on the board? Check the same with VD0R. If all voltages are reported low by the SMC it would indicate a AVREF issue.