Laptop voltages at coils and meanings?

[paulyboy]

I've recently started learning repairs reading YouTube etc


My question is I have a few Asus and hps that don't have any boardviews or schematics so I was wondering if there's a best sequence to follow in troubleshooing a laptop that isn't powering on.

I see there's various coils on most boards and I'm sure there realitive to 3v 5v memory? Cpu?

I guess I'm asking is what would one expect to find traditionaly on most motherboards and look to measure values from.

Kind regards

Paul

[rielfreak]

I usually start with the main +19V (voltage rail after the 2 mosfets from DC in jack) then power button 3V pullup then the main 3V/5V regulator. HPs should have a white light in the DC in jack when plugged in without battery.

[paulyboy]

Originally Posted by rielfreak

I usually start with the main +19V (voltage rail after the 2 mosfets from DC in jack) then power button 3V pullup then the main 3V/5V regulator. HPs should have a white light in the DC in jack when plugged in without battery.

Thankyou for your reply, is there a sequence in how they turn on to know when a power rail is missing?