HP PROBOOK 4340S

[sullysys]

Case Study, hp probook 4340s, all voltages present except vgfx. flashed bios still same, ddr_rst on ram pin30 present 1.5v, vcore present 1.1v, vtt present 0.75v... what is problem, checked pu4201, signals ok, checked pu44404, all input present, vcc, bst, pwm, enable, but no output, no gate voltages, changed pu4401 fet and now vgfx present... Glory to God. here is original backup bios dump...