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Old 11-01-2021, 03:47 AM   #1
paulyboy
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Default Laptop voltages at coils and meanings?

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
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Old 11-01-2021, 05:53 AM   #2
rielfreak
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Default Re: Laptop voltages at coils and meanings?

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.
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Old 11-01-2021, 11:49 AM   #3
paulyboy
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Default Re: Laptop voltages at coils and meanings?

Quote:
Originally Posted by rielfreak View Post
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?
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