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Re: My new-to-me renewed laptop is dead.

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On Sun, 1/26/2025 11:25 AM, Frank Slootweg wrote:
> micky <NONONOmisc07@fmguy.com> wrote:
> [...]
> 
>>>  If there are LEDs, but none of them are lit, and the light of the charger
>>> itself is on, I would suspect a bad cable/connection from the charger to
>>> the laptop or indeed a totally dead laptop.
>>
>> It's supposed to be 19.5 volts but the highest number I could get from
>> my VOM was 17v, and that quickly dropped, gradually or as low as 5!  Of
>> course it was hard to hold the probe to the center pin, and i'm not
>> building a jig just for this.  I'll see what the vendor says. 
> 
>   This is probably one for Paul (my electronics knowledge is limited and
> slipping), but AFAIK, a laptop adapter will not supply the specified
> voltage unless you draw some current from it, which your meter doesn't
> do (well, only very little, not enough).
> 
> [...]
> 

it should be fine, no load. You would get 19.5V.
If you shorted it, it would give 0 and there would
be a spark (capacitor discharge).

The results Micky is getting, suggest the adapter
is not all that happy.

However, there is one other possibility. Some adapters
actually have three electrical contact points, and one
of them is an "enable". If the adapter is that type, then
the contact with the actual power on it, won't be enabled
while the plug is sitting in air.

I don't know the details of this, I was only told
of the possibility of that being present. Perhaps both
the jack and the barrel plug are larger than normal
for those. My laptop is only two contacts, and the
center contact, there is no room for any third option.

This example is a third build option. Some laptops
have available to them, two power levels for the adapter.
The third contact on the barrel, is a serial declaration
ROM. These are used on gamer laptops, to determine what
got plugged in. The laptop then avoids overloading the
lower-power adapter, if it is discovered to be present.

https://electronics.stackexchange.com/questions/16047/3-contact-laptop-power-supply

Using a calibrated eyeball, you can examine both parts
involved, to determine whether it's just a plain two contact
case, or is one of the more complicated ones. It is likely
to take a "wide" barrel, to do a complicated one.

  Paul

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Thread

My new-to-me renewed laptop is dead.  micky <NONONOmisc07@fmguy.com> - 2025-01-26 03:59 -0500
  Re: My new-to-me renewed laptop is dead. Paul <nospam@needed.invalid> - 2025-01-26 05:52 -0500
    Re: My new-to-me renewed laptop is dead. micky <NONONOmisc07@fmguy.com> - 2025-01-26 11:03 -0500
      Re: My new-to-me renewed laptop is dead. Frank Slootweg <this@ddress.is.invalid> - 2025-01-26 16:19 +0000
        Re: My new-to-me renewed laptop is dead. SOLVED, or Problem went away.  micky <NONONOmisc07@fmguy.com> - 2025-04-02 18:22 -0400
      Re: My new-to-me renewed laptop is dead. Mike Easter <MikeE@ster.invalid> - 2025-01-26 11:07 -0800
  Re: My new-to-me renewed laptop is dead. Frank Slootweg <this@ddress.is.invalid> - 2025-01-26 15:34 +0000
    Re: My new-to-me renewed laptop is dead. micky <NONONOmisc07@fmguy.com> - 2025-01-26 11:11 -0500
      Re: My new-to-me renewed laptop is dead. Frank Slootweg <this@ddress.is.invalid> - 2025-01-26 16:25 +0000
        Re: My new-to-me renewed laptop is dead. Paul <nospam@needed.invalid> - 2025-01-26 16:17 -0500
          Re: My new-to-me renewed laptop is dead. micky <NONONOmisc07@fmguy.com> - 2025-01-28 10:24 -0500
            Re: My new-to-me renewed laptop is dead. Paul <nospam@needed.invalid> - 2025-01-28 16:15 -0500
        Re: My new-to-me renewed laptop is dead. micky <NONONOmisc07@fmguy.com> - 2025-04-02 18:21 -0400
  Re: My new-to-me renewed laptop is dead. Brian Gregory <void-invalid-dead-dontuse@email.invalid> - 2025-01-26 17:06 +0000
    Re: My new-to-me renewed laptop is dead.  SOLVED micky <NONONOmisc07@fmguy.com> - 2025-01-27 22:55 -0500
      Re: My new-to-me renewed laptop is dead. SOLVED Paul <nospam@needed.invalid> - 2025-01-27 23:42 -0500
        Re: My new-to-me renewed laptop is dead. SOLVED Paul <nospam@needed.invalid> - 2025-01-28 01:13 -0500
  Re: My new-to-me renewed laptop is dead. Paul in Houston TX <Paul@Houston.Texas> - 2025-01-28 18:44 -0600

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