Hey Houptee, I'm ready to throw in the towel on this if the new compressor could have been damaged. Are the odds good that doing the software update on the new board will fix the problem? If not, it's the scrap heap for the LG. thanks,
If compressor is running it might be leak in sealed system or under or overcharged. How did you evacuate and weigh in the charge? It only needs the amount of 134a shown on the decal inside the fridge. Do you have guages hooked up to high and low side? When off the pressures should equalize at approximately 40psi and when running low side is very low almost 0 sometimes and around 100 high side. Pressure depends on the ambient temperature of the room but that is ballpark what to look for.
Many techs blow out the condenser with nitrogen and find black sludge comes out so some say they just automatically put in nrw condenser if doing compressor on LG to avoid call back.