Help me troubleshoot Hp Pavillion 15 DAG74AMB8D0 REV D Power

[sarry86]

As usual please guys go easy on me 🥶, I have this mentioned laptop that was once working but with display problem, my friend took it to an inexperienced technician (like me 🤒) and they got it completely dead, now he has brought it back to me and gave me for spare parts. Although I am not an experienced technician, initial troubleshooting suggests that the pc has the sign of life as it hasn't been shorted anywhere (visual inspection) nothing is heating up and all the voltages prior to the main power rails are available (according to the schematic) it is just some area where it seems the voltages doesn't reach. Now I have been trying to troubleshoot everyday and came to realize that the PU15 doesn't generate +1.8_DEEP_SUS voltage, can this voltage alone cause no power to the mobo?





[Mod. Edit]
Schematic -> https://www.badcaps.net/forum/troubl...ic#post3205338
Boardview -> https://www.badcaps.net/forum/troubl...54#post3205554

Reminder: rules and organization of this section
https://www.badcaps.net/forum/showthread.php?t=117483

[sarry86]

Never mind, I fixed it! It turned out to be the bios chip that was fault, desoldered another of the same type from a spare board, reprogrammed and now the laptop is up. Thanks everyone

[sarry86]

With the help of boardviewer software, i traced the vcc of the kbc and there's no 3v at all, the entire line associated with it doesn't have a 3v. Please someone tell me where is this voltage generated from because it seems like it doesn't get generated from the PU10 nor PU11, is it too generated by the PU13? I can see the PU13 generates +2.5VSUS

[sarry86]

Sorry it was the PU13 and it doesn't generate +2.5VSUS

[sarry86]

Never mind, I fixed it! It turned out to be the bios chip that was fault, desoldered another of the same type from a spare board, reprogrammed and now the laptop is up. Thanks everyone