“I see your report and have a question. Your report discribes resistance value between P3 and P7 of IC4801 is very little.
Do you check IC4801 itself at "P3, P7 After remove"? If it is, IC4801 is not good. But before you said IC4801 had already been changed as new one.
It is incongruous. If it isn't, PCB itself is not good. Could you take a picture at the point I show by attached figure? Red line (attached figure shows) is doubtful.