HP Pavilion G4(R23) Dead No Display Repair Guide

HP Pavilion G4(R23) >Open the laptop and removed dust and corrosion. >Checked all coils and bios impedence, all are good.. >Now connected the DC Jack, ampere goes to 0.071.. > I found S.B IC is heating... >But i didn't removed the IC, checked the impedence at all of it's pin.. >Got impendece value. >Now I move on to checking the voltage requirements.. > Firstly I checked the VIN supply to the IC, but i didn't got VIN on respective pin of the IC.. >Now I opened the schematics, found that at one end of resistor 19v present but on other end only 2.5v there, so i replaced the resistor from scrap board.. >After replacing resistor, again I connected a DC jack, now SB IC is not heating and ampere is showing 0.025 .. >Now I triggered the board, ampere rised to 0.650,..but no display😭 > Now I done the Bios, changed the ram, cleaned the ram slot, washed the board and put in owen etc... But again no results 😔. > Now randomly found one IC PU12 just below the ram slot.. >That IC is getting all inputs and enable, but not releasing output, that should be around 2.5v as per schematics,.. >Now I changed the IC from scrap board with correct number, luckily I got the same IC.. Now again I connected DC jack, triggered the board now ampere rised the 1.300 and came back to 0.956, .. >😀got the Display.... Copyright Case Study For Learning