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How do I find a power adapter spec for an old Hyundai laptop?

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  How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-01 13:38 -0500
    Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-01 20:33 -0500
      Re: How do I find a power adapter spec for an old Hyundai laptop? Randy Jones <randolphJones@randyjones.com> - 2025-05-03 23:17 +0200
        Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-03 17:04 -0500
          Re: How do I find a power adapter spec for an old Hyundai laptop? Ivano Rossi <Ivano.Rossi@nospam.tin.it> - 2025-05-04 00:43 +0200
            Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-03 21:12 -0400
            Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-04 00:31 -0500
            Re: How do I find a power adapter spec for an old Hyundai laptop? Mark Lloyd <not.email@all.invalid> - 2025-05-04 18:14 +0000
              Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-04 14:51 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-07 01:35 -0400
                  Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 07:33 -0400
                  Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 15:16 -0400
                    Re: How do I find a power adapter spec for an old Hyundai laptop? Uncle Bob <uncle.bob@nospam.net> - 2025-05-07 18:07 -0400
                      Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 19:55 -0400
                        Re: How do I find a power adapter spec for an old Hyundai laptop? david <this@is.invalid> - 2025-05-08 05:27 -0600
                      Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 21:58 -0400
                        Re: How do I find a power adapter spec for an old Hyundai laptop? Larry Wolff <larrywolff@larrywolff.net> - 2025-05-08 07:21 -0400
                          Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:08 -0400
                      Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 11:06 +0100
                        Re: How do I find a power adapter spec for an old Hyundai laptop? Peter <confused@nospam.net> - 2025-05-08 12:15 +0100
                          Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 12:42 +0100
                            Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:18 -0400
                  Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-07 22:08 -0500
                  Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:13 -0400
                    Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 08:28 -0400
            Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:10 -0400
              Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:42 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-11 08:33 +0100
    Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-01 21:37 -0400
      Re: How do I find a power adapter spec for an old Hyundai laptop? Frank Slootweg <this@ddress.is.invalid> - 2025-05-03 12:33 +0000
    Re: How do I find a power adapter spec for an old Hyundai laptop? "...winston" <winstonmvp@gmail.com> - 2025-05-01 23:52 -0400
    Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-02 01:56 -0400
      Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-02 13:57 -0400

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#184235 — How do I find a power adapter spec for an old Hyundai laptop?

How do I find a power adapter for an old Hyundai laptop?
There are no markings on the laptop whatsoever other than the logo.

Size: ~13-3/4 by ~9-1/8, screen is ~12-1/8 by ~6-3/4 (~13-3/4 diagonal).
Shape: Wedge-like, thicker at the hinge, thinner at the front.
Branding: White molded "Hyundai" on the top case only.
Left Ports (hinge to front): Power, USB, HDMI (Power just says "DC").
Right Ports (hinge to front): USB, aux jack, microSD slot.
Hinge: Opens ~180 degrees, no ports on the hinge itself.
Trackpad: ~3.75" x 2", centered below the keyboard.
LEDs (above keyboard): 3 status (+, A, 1) and 2 microphone LEDs.
Bottom Vents (front corners): Two sets of 7 slots each (~1.25" x 0.375").
No ports on the front edge of the wedge which is about 1/4 inch thick. 
Camera in center above screen. 10 screws hold the bottom plate on.

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#184238

Umberto wrote:
> How do I find a power adapter for an old Hyundai laptop?
> There are no markings on the laptop whatsoever other than the logo.
> 
> Size: ~13-3/4 by ~9-1/8, screen is ~12-1/8 by ~6-3/4 (~13-3/4 diagonal).
> Shape: Wedge-like, thicker at the hinge, thinner at the front.
> Branding: White molded "Hyundai" on the top case only.
> Left Ports (hinge to front): Power, USB, HDMI (Power just says "DC").
> Right Ports (hinge to front): USB, aux jack, microSD slot.
> Hinge: Opens ~180 degrees, no ports on the hinge itself.
> Trackpad: ~3.75" x 2", centered below the keyboard.
> LEDs (above keyboard): 3 status (+, A, 1) and 2 microphone LEDs.
> Bottom Vents (front corners): Two sets of 7 slots each (~1.25" x 0.375").
> No ports on the front edge of the wedge which is about 1/4 inch thick. 
> Camera in center above screen. 10 screws hold the bottom plate on.

Google:  Hyundai laptop power supply

12V, 2A

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#184274

On Thu, 1 May 2025 20:33:44 -0500, Paul in Houston TX wrote:

> Google:  Hyundai laptop power supply
> 
> 12V, 2A

That will only work if the company makes only one laptop power supply.
Does it?

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#184277

Randy Jones wrote:
> On Thu, 1 May 2025 20:33:44 -0500, Paul in Houston TX wrote:
> 
>> Google:  Hyundai laptop power supply
>>
>> 12V, 2A
> 
> That will only work if the company makes only one laptop power supply.
> Does it?

IDK.  However, if you search the internet, including the Hyundai 
website, you will only find the 12V, 2A or 3A models.

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#184279

On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:

>>> Google:  Hyundai laptop power supply
>>>
>>> 12V, 2A
>> 
>> That will only work if the company makes only one laptop power supply.
>> Does it?
> 
> IDK.  However, if you search the internet, including the Hyundai 
> website, you will only find the 12V, 2A or 3A models.

Isn't 12 volts far too low for any modern laptop power supply?
Aren't they usually around 20 volts?

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#184281

On Sat, 5/3/2025 6:43 PM, Ivano Rossi wrote:
> On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:
> 
>>>> Google:  Hyundai laptop power supply
>>>>
>>>> 12V, 2A
>>>
>>> That will only work if the company makes only one laptop power supply.
>>> Does it?
>>
>> IDK.  However, if you search the internet, including the Hyundai 
>> website, you will only find the 12V, 2A or 3A models.
> 
> Isn't 12 volts far too low for any modern laptop power supply?
> Aren't they usually around 20 volts?
> 

They have to be high enough to charge the battery pack cheaply.
Like, with a buck converter.

A battery pack running between 14.4V and 16.8V, could likely
be charged from a 19V source. That might work.

A battery pack operating at 7.2V to 8.4V could be operated from a 12V source.
You would just put more chains in parallel (like a 2S3P or
a 2S4P pack) to get more watt-hours to compensate for the lower
voltage. Equalizing the charge might be more of a problem.

A disadvantage of doing this, is the SMPS for VCore is likely
less efficient. A higher voltage would work a bit better.

I would guess the engineer looked at the BOM cost, and made
that the number one priority. The 12V 2A adapter is a common
item for external 3.5" HDD enclosures. They have a spec like that,
with an unstated spec of allowing a bit more current for a few
seconds, without the current limiter cutting out. The HDD
adapters aren't exactly 12V @ 2A, cutting out at 2.000 A. They
should be able to deliver a bit more current, on demand. This adapter
won't have an opportunity to demonstrate that, but the design
may just be a HDD wall adapter with a slightly different skin.

   Paul

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#184282

Ivano Rossi wrote:
> On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:
> 
>>>> Google:  Hyundai laptop power supply
>>>>
>>>> 12V, 2A
>>>
>>> That will only work if the company makes only one laptop power supply.
>>> Does it?
>>
>> IDK.  However, if you search the internet, including the Hyundai
>> website, you will only find the 12V, 2A or 3A models.
> 
> Isn't 12 volts far too low for any modern laptop power supply?
> Aren't they usually around 20 volts?

Internet search:

HYUNDAI BATTERY 7.4V 5000MAH 37WH E466113 HYBOOK HT14CCIC44EGP.

Specifications for HYUNDAI Thinnote-A 14.1" Laptop Celeron N3350 | 4GB | 
64GB | Windows 10 Pro ; Camera, Front 2.0MP ; Battery, 7.4V, 5000mAh 
Lithium-ion Polymer.

Makes me wonder how long the laptop will run on battery.
Most of the internal stuff will use from 1v to approx 5v.
Note the WH on the first battery = 37 WH.
WH = IxE.  Boost the E to 20V and it makes 100 WH.
Since most of the stuff runs at 1v to 5v, a 20v battery would give more 
WH reserves... and make the LT heavier and bigger.

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#184286

On Sun, 4 May 2025 00:43:41 +0200, Ivano Rossi wrote:

> On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:
> 
>>>> Google:  Hyundai laptop power supply
>>>>
>>>> 12V, 2A
>>> 
>>> That will only work if the company makes only one laptop power supply.
>>> Does it?
>> 
>> IDK.  However, if you search the internet, including the Hyundai
>> website, you will only find the 12V, 2A or 3A models.
> 
> Isn't 12 volts far too low for any modern laptop power supply?
> Aren't they usually around 20 volts?

The only recent laptop I've had that used 12V was the Asus netbook.

-- 
Mark Lloyd
http://notstupid.us/

"Atheist: A person who believes in one less god than you do." [Rev.
Donald Morgan, Atheologist]

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#184287

On Sun, 5/4/2025 2:14 PM, Mark Lloyd wrote:
> On Sun, 4 May 2025 00:43:41 +0200, Ivano Rossi wrote:
> 
>> On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote:
>>
>>>>> Google:  Hyundai laptop power supply
>>>>>
>>>>> 12V, 2A
>>>>
>>>> That will only work if the company makes only one laptop power supply.
>>>> Does it?
>>>
>>> IDK.  However, if you search the internet, including the Hyundai
>>> website, you will only find the 12V, 2A or 3A models.
>>
>> Isn't 12 volts far too low for any modern laptop power supply?
>> Aren't they usually around 20 volts?
> 
> The only recent laptop I've had that used 12V was the Asus netbook.
> 

You can do VCore power conversion, off the +5V rail.

I have an AthlonXP board (A7N8X), where there was no ATX12V connector,
and the current came in through the ATX 20 pin main connector. Cylindrical
input inductor and three caps on the 5V side. Two iron core toriods on the output
side and five electrolytics. Four MOSFETs, a pair per phase, knuckle draggers
with high gate capacitance. You don't run these on modern power supplies,
you go to the junk room and find one with a "strong" 5V output. While
gaming, the +5V consumption was high enough, it would cause most modern
PSU to shut off :-)

   https://images.anandtech.com/reviews/motherboards/roundups/2002/Q4/nForce2/asus/board.jpg

Four wires on the 20 pin connector, carried the current (13 amps plus).
There was a Richtek 50KHz converter,
and there were some "beefy" MOSFETs on there. And somehow, there
was enough gate swing, to turn those MOSFETs fully on and fully off.
And that powered a 65W processor. Normally, an estimate of a "good"
power rating for a phase on VCore, is a target of 30-35 watts,
so from an estimation perspective, you would expect to find
two phases on such a design (for 65W).

The board designs switched to ATX12V right after that, and suddenly
RichTek wasn't the only game in town.

Most power converters (SMPS) have run at higher frequencies
than 50KHz. The record holder, is the Haswell FIVR inside the
CPU package, running its power converter at 200MHz. Nobody
else has some close to being that bold, since.

The designs today, are rather cheesy. There are some "favored" MOSFETs
for PC design. You use a shitload of those, for no particular reason.
Some of the designs run hot. On the Asus side, they did a multi-phase
design, where they had *three* banks in parallel. That's three phases
with exactly the same timing and firing point, and the currents from them
add. That wouldn't be necessary, if you spent a buck or two more
on a better MOSFET. But I have to admit, I'm impressed with the
temperature rise that gives. Lukewarm  when flat out at 200 Watts.
There is as much heat coming from resistive loss in the PCB, as in the MOSFETs!
There is likely more VCore ripple on those boards, but there is
no sign of instability that I can see.

For that board, an electrical type set up a go-fund-me, to buy a small
multi-channel scope, so he could take pictures of the phase firing order,
and prove what they were doing :-) Which is also a cool aspect of our
current time. Donation-ware reverse engineering.

   Paul

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#184319

On 04/05/2025 14:51, Paul wrote:

>>> Aren't they usually around 20 volts?
>> 
>> The only recent laptop I've had that used 12V was the Asus netbook.
>> 
> 
> You can do VCore power conversion, off the +5V rail.

I am sorry for not responding sooner but I had to help someone who was
sick. Here are front and back pictures of the laptop in question.
https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
https://postimg.cc/delete/S3nngb1Z/c6d4e38d

The one thing that seems to be DIFFERENT from all photos of Hyundai laptops
I've found in an images.google.com search is where the trackpad lines up.

Notice that the right edge of the trackpad lines up almost exactly between
the "Alt" and "Control" key (actually it hits the edge of the "Alt" key).

I just saw the recommendation to remove the case to read the battery.
I will do that next. 

Thanks for your help in identifying what the charger is for this laptop.

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#184324

On 05/07/2025 1:35 AM, Umberto wrote:
> On 04/05/2025 14:51, Paul wrote:
> 
>>>> Aren't they usually around 20 volts?
>>>
>>> The only recent laptop I've had that used 12V was the Asus netbook.
>>>
>>
>> You can do VCore power conversion, off the +5V rail.
> 
> I am sorry for not responding sooner but I had to help someone who was
> sick. Here are front and back pictures of the laptop in question.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://postimg.cc/delete/S3nngb1Z/c6d4e38d
> 
> The one thing that seems to be DIFFERENT from all photos of Hyundai laptops
> I've found in an images.google.com search is where the trackpad lines up.
> 
> Notice that the right edge of the trackpad lines up almost exactly between
> the "Alt" and "Control" key (actually it hits the edge of the "Alt" key).
> 
> I just saw the recommendation to remove the case to read the battery.
> I will do that next.
> Thanks for your help in identifying what the charger is for this laptop.
could you rig up a battery charger that sense the battery voltage, and 
provides that voltage.  It would take the rigging up of they proper plug 
size for the computer.

The idea is to give the battery enough charge that you could get into 
the computer, and find some specifications.

Alternately google search the the location of the identification plate 
for a Hyundai laptop.  You may have to take the back cover off to find 
some identification markings.

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#184330

On Wed, 5/7/2025 1:35 AM, Umberto wrote:
> On 04/05/2025 14:51, Paul wrote:
> 
>>>> Aren't they usually around 20 volts?
>>>
>>> The only recent laptop I've had that used 12V was the Asus netbook.
>>>
>>
>> You can do VCore power conversion, off the +5V rail.
> 
> I am sorry for not responding sooner but I had to help someone who was
> sick. Here are front and back pictures of the laptop in question.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://postimg.cc/delete/S3nngb1Z/c6d4e38d
> 
> The one thing that seems to be DIFFERENT from all photos of Hyundai laptops
> I've found in an images.google.com search is where the trackpad lines up.
> 
> Notice that the right edge of the trackpad lines up almost exactly between
> the "Alt" and "Control" key (actually it hits the edge of the "Alt" key).
> 
> I just saw the recommendation to remove the case to read the battery.
> I will do that next.
> Thanks for your help in identifying what the charger is for this laptop.

My guess, is this is an ODM laptop, devoid of most markings.
With ODM, each model can be ordered from a different company.
The circuit board in one of the HyBooks is made by "Eii".
I don't think "renowned" is quite the name I would use.
The word "obscure" comes to mind. They also likely don't
do their own fabrication, so the PCB manufacturing plant is unknown.
This might be a "design house", and in the Chinese system, there
is plenty of matrix manufacturing capability.

   "Established in 2013, Eii Technology is a renowned ODM (Original Design Manufacturer)
    company located in the vibrant hub of Shenzhen's Qianhai bay. Our primary focus is
    on the production and marketing of consumer electronics, encompassing notebook PCs,
    All-in-One (AIO) computers, and tablet PCs. Our dedicated team of 120 professionals
    operates from our Shenzhen headquarters, with 40% of them boasting over a
    decade of R&D experience.

The pouch pack inside the laptop, is similarly untraceable.

It is not made by Hyundai and does not have a Hyundai part number.

This product is, unfortunately, a PCChips-like product. And really hard to identify.

Now, one of the Hybook, has white lettering on the bottom of the laptop. The
lettering is in the center and up near the hinge end of the bottom of the unit.
But because the letters are only silk screened on, if the laptop
sits on the users lap, it's easy to wear the lettering off. And
that may have been the only laptop identifier, is some white text on the bottom.

The circuit board has a date on it, this one is the year 2020 for example.
But to gain access to it, requires removal of the heat spreader plate. And
that means fitting it and putting the thermal paste back later.

   https://www.youtube.com/watch?v=SwLUF1XbTjE

The whole job is not an easy task -- unless the white lettering is
still visible on the bottom.

Sorry,
    Paul

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#184334

On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:

> The whole job is not an easy task -- unless the white lettering is
> still visible on the bottom.

Thanks for looking at it where you noticed there's NOTHING by way of
description other than the one brand name on the outside top cover.

I made a small mistake in the links to the pictures which I fixed below.
https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg

This is a google search for images of a similar 14-inch Hyundai laptop.
https://www.google.com/search?tbm=isch&q=hyundai+14+laptop

Since a search of images isn't finding ANYTHING like it, I'll rip it open
where I hope to find what the battery charger voltage & amps is inside.

Thanks for all the advice.

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#184336

On 05/07/2025 6:07 PM, Uncle Bob wrote:
> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
> 
>> The whole job is not an easy task -- unless the white lettering is
>> still visible on the bottom.
> 
> Thanks for looking at it where you noticed there's NOTHING by way of
> description other than the one brand name on the outside top cover.
> 
> I made a small mistake in the links to the pictures which I fixed below.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
> 
> This is a google search for images of a similar 14-inch Hyundai laptop.
> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
> 
> Since a search of images isn't finding ANYTHING like it, I'll rip it open
> where I hope to find what the battery charger voltage & amps is inside.
> 
> Thanks for all the advice.
For best results, I would rip it apart using all of the proper techniques.

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#184346

Using <news:vvgrub$1akkf$1@dont-email.me>, knuttle wrote:

> For best results, I would rip it apart using all of the proper techniques.

The op will need a spudger kit and maybe those pentacostal screwdrivers.
https://www.amazon.com/STREBITO-Screwdriver-142-Piece-Electronics-Precision/dp/B08SGM6F79/

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#184338

On Wed, 5/7/2025 6:07 PM, Uncle Bob wrote:
> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
> 
>> The whole job is not an easy task -- unless the white lettering is
>> still visible on the bottom.
> 
> Thanks for looking at it where you noticed there's NOTHING by way of
> description other than the one brand name on the outside top cover.
> 
> I made a small mistake in the links to the pictures which I fixed below.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
> 
> This is a google search for images of a similar 14-inch Hyundai laptop.
> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
> 
> Since a search of images isn't finding ANYTHING like it, I'll rip it open
> where I hope to find what the battery charger voltage & amps is inside.
> 
> Thanks for all the advice.
> 

The battery is, if memory serves, 8.4V or two cells in series.
The 8.4V is the fully charged voltage, and 7.4V is closer
to the "nominal" voltage after it settles. Charging it from 12V
makes sense. If a 19V adapter was used, that would be wasteful,
with some amount of heat generated.

Lithium cells have to be charged with a "precision" charger.
The cells have high energy density (which is why we use them),
but they are also fairly unstable and must be treated with respect.
That's why there are videos of laptop fires.

You could use any external voltage you wanted, if there was a
buck converter inside, but I don't think they do the design
that way. Someone in a USENET group, used a "generic" adapter
which had a slightly higher voltage than was required, and
about a month later he wrote back to report the laptop no longer
charged the battery and something had broken. I take this as a
sign that the machines are not tolerant of using the wrong voltage.

   Paul

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#184345

On 5/7/2025 9:58 PM, Paul wrote:

>> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
>> 
>>> The whole job is not an easy task -- unless the white lettering is
>>> still visible on the bottom.
>> 
>> Thanks for looking at it where you noticed there's NOTHING by way of
>> description other than the one brand name on the outside top cover.
>> 
>> I made a small mistake in the links to the pictures which I fixed below.
>> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
>> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
>> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
>> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
>> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
>> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
>> 
>> This is a google search for images of a similar 14-inch Hyundai laptop.
>> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
>> 
>> Since a search of images isn't finding ANYTHING like it, I'll rip it open
>> where I hope to find what the battery charger voltage & amps is inside.
>> 
>> Thanks for all the advice.
>> 
> 
> The battery is, if memory serves, 8.4V or two cells in series.
> The 8.4V is the fully charged voltage, and 7.4V is closer
> to the "nominal" voltage after it settles. Charging it from 12V
> makes sense. If a 19V adapter was used, that would be wasteful,
> with some amount of heat generated.
> 
> Lithium cells have to be charged with a "precision" charger.
> The cells have high energy density (which is why we use them),
> but they are also fairly unstable and must be treated with respect.
> That's why there are videos of laptop fires.
> 
> You could use any external voltage you wanted, if there was a
> buck converter inside, but I don't think they do the design
> that way. Someone in a USENET group, used a "generic" adapter
> which had a slightly higher voltage than was required, and
> about a month later he wrote back to report the laptop no longer
> charged the battery and something had broken. I take this as a
> sign that the machines are not tolerant of using the wrong voltage.

Why is a step down DC to lower DC converter called a buck converter?
Shouldn't it be called a variable duty cycle converter instead? 
I s'pose the name contrasts better with that of a boost converter.

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#184349

On Thu, 5/8/2025 7:21 AM, Larry Wolff wrote:

> 
> Why is a step down DC to lower DC converter called a buck converter?
> Shouldn't it be called a variable duty cycle converter instead? 
> I s'pose the name contrasts better with that of a boost converter.
> 

There are three types, buck, boost, and buck-boost :-)

The buck-boost is the most complicated.

If you have a five volt input device, and the output is
variable and knob adjustable, then to make six volts
on output it runs in boost mode, and to make four
volts it runs in buck mode.

Someone at work commissioned someone outside the company
to build us a buck-boost on a PCB and the circuit was huge
in terms of component count.

In principle, you could do a boost first, followed by a buck,
and get a dial-adjustable voltage. But that's two conversions,
and the boost might only be 80% efficient, and the circuit
is going to get warm if you do it that way. A fully integrated
buck-boost changes modes, so there is only ever one conversion
going on at a time.

Buck is pretty efficient, or at least, it's easier to optimize.

*******

And thank goodness, there's a Wiki for this. As a bonus,
it even covers some of the methods used in LED lighting
(SEPIC and CUK, at least according to one article).

   https://en.wikipedia.org/wiki/Buck%E2%80%93boost_converter

  Paul

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#184342

Uncle Bob <uncle.bob@nospam.net> wrote:
> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
> 
> > The whole job is not an easy task -- unless the white lettering is
> > still visible on the bottom.
> 
> Thanks for looking at it where you noticed there's NOTHING by way of
> description other than the one brand name on the outside top cover.
> 
> I made a small mistake in the links to the pictures which I fixed below.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
> 
> This is a google search for images of a similar 14-inch Hyundai laptop.
> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
> 
> Since a search of images isn't finding ANYTHING like it, I'll rip it open
> where I hope to find what the battery charger voltage & amps is inside.

https://www.youtube.com/watch?v=uAS2mDoCFng

Not an identical match (the logo is not centred on that one) but pretty
close.

Which leads me to:
https://www.walmart.com/ip/HYUNDAI-14-Inch-Hybook-4GB-RAM-128GB-Storage-Windows-10-Home-Laptop-Intel-Celeron-N4020-Expandable-microSD-Slot-Up-256GB-14-1-IPS-Display-WiFi-Blueto/266069040

(something odd about the pictures there - it appears to have two microSD
slots.  I wonder if they've been letting AI near the pictures...)

7.4V battery according to the specs.  

I managed to find 3 power adapters on ebay and Amazon for it, however:
One just says Output: 20W Max
Another looks like AI has mangled the text

This one has the output specs blanked out:
https://www.amazon.com/Kircuit-HT14CCIC44EGH-HT14CCIC44EGP-HT14CCIC81EG-HTLB14INC4Z4ES/dp/B0CPPMTJYB
but the description says 12V.

So I suppose 12V 2A would do it.  That sounds right for a 7.4V two-cell
battery and a buck converter to charge it.

It's a $150 laptop that everyone says is awful, so I wouldn't spend too much
on it :-)  But you probably have a 12V adapter lying around anyway.

Theo

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#184344

Theo <theom+news@chiark.greenend.org.uk> wrote:

>> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
>> 
>>> The whole job is not an easy task -- unless the white lettering is
>>> still visible on the bottom.
>> 
>> Thanks for looking at it where you noticed there's NOTHING by way of
>> description other than the one brand name on the outside top cover.
>> 
>> I made a small mistake in the links to the pictures which I fixed below.
>> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
>> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
>> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
>> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
>> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
>> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
>> 
>> This is a google search for images of a similar 14-inch Hyundai laptop.
>> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
>> 
>> Since a search of images isn't finding ANYTHING like it, I'll rip it open
>> where I hope to find what the battery charger voltage & amps is inside.
> 
> https://www.youtube.com/watch?v=uAS2mDoCFng
> 
> Not an identical match (the logo is not centred on that one) but pretty
> close.
> 
> Which leads me to:
> https://www.walmart.com/ip/HYUNDAI-14-Inch-Hybook-4GB-RAM-128GB-Storage-Windows-10-Home-Laptop-Intel-Celeron-N4020-Expandable-microSD-Slot-Up-256GB-14-1-IPS-Display-WiFi-Blueto/266069040
> 
> (something odd about the pictures there - it appears to have two microSD
> slots.  I wonder if they've been letting AI near the pictures...)
> 
> 7.4V battery according to the specs.  
> 
> I managed to find 3 power adapters on ebay and Amazon for it, however:
> One just says Output: 20W Max
> Another looks like AI has mangled the text
> 
> This one has the output specs blanked out:
> https://www.amazon.com/Kircuit-HT14CCIC44EGH-HT14CCIC44EGP-HT14CCIC81EG-HTLB14INC4Z4ES/dp/B0CPPMTJYB
> but the description says 12V.
> 
> So I suppose 12V 2A would do it.  That sounds right for a 7.4V two-cell
> battery and a buck converter to charge it.
> 
> It's a $150 laptop that everyone says is awful, so I wouldn't spend too much
> on it :-)  But you probably have a 12V adapter lying around anyway.
> 
> Theo

Then there's also the problem of which size DC connector it uses.
      2.5mm x 0.7mm  
      3.5mm x 1.35mm
      3.5mm x 1.1mm
      4.0mm x 1.7mm  
      4.8mm x 1.7mm 
      5.5mm x 1.7mm
      5.5mm x 2.1mm  
      5.5mm x 2.5mm 
      6.3mm x 3.0mm
      6.0mm x 4.4mm  
      6.3mm x 4.4mm 

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