Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

Filter by
Sorted by
Tagged with
-2
votes
2answers
510 views

How do I do to solder the adapter in the port and still use the same usb port without ruining the notebook? [closed]

I have a laptop that the wireless network card does not work, but I do not want to use my usb input for putting an external adapter, my idea is to open the laptop and solder the adapter inside the ...
1
vote
2answers
79 views

20V laptop power supply from four 5V+5A 'baby' supplies

I've got an old gaming laptop which comes with a very annoyingly big brick PSU, rated at 100W and 20V. I do not care that the PSU is heavy, but it has a weird form factor, and I always have to drag ...
0
votes
2answers
2k views

Scratched 18650 Lithium Battery safe to use? [closed]

I tried to salvage 18650 batteries from a dead laptop battery, in the process I peeled off and scratched the metal casing a little bit with my utility knife (see attached image below), Other than that ...
2
votes
2answers
1k views

Replacing cells in laptop battery

I successfully opened the battery of my laptop without damaging the case, and now, I want to replace the worn out batteries (2600mAh) with more powerful ones (3200mAh). I know the risks of working ...
0
votes
1answer
132 views

Why laptop reboots after electrostatic discharge

So why does this happens when my laptop is plugged to the charger? Typical charger scheme looks like this: What is the path for discharge current? Low voltage part seems to be isolated from power ...
1
vote
2answers
143 views

What type of a connector is this?

What type of a connector is the white one in the middle of the photo. It has pins on both sides and connects to the underside of a laptop motherboard. I'd like to find an extender for it so that I ...
0
votes
2answers
1k views

Is it possible to increase amperage and voltage?

I have an input of 5V and 2 amps from a USB battery pack. Using this voltage and amperage, could it be possible to increase both values? Here is an extremely simple representation of my idea.
4
votes
1answer
791 views

Proper way to recover 18650 cells from laptop batteries [closed]

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
0
votes
3answers
2k views

power 12v fan using laptop charger while running laptop

I have a laptop with partially damaged internal fan. Dont want to buy new one. I am thinking of swapping the internal fan to a 12V fan. The 12V fan I have can fit as it is small. Internal fan is 5V. ...
5
votes
6answers
579 views

why do laptops have 10 or 20 volt batteries if most components only use logic level voltages

I've noticed that often laptop chargers and batteries are higher voltages than logic levels, 1 to 5 v. I am building a laptop and was originally using 3.7 v lipo battery. I am curious if I should put ...
0
votes
1answer
171 views

What can cause a very low frequency sound from a laptop? [duplicate]

I have a Clevo M57RU laptop here. Whenever it goes to stand-by, sleep or is shut down I hear a VLF sound (presumably close to the ~20 kHz maximum of the human ear) that's even better to hear if the ...
3
votes
3answers
1k views

Are laptop cells balanced while charging?

I have little-to-no knowledge about how the laptop batteries work. I know there is a microcontroller to actually verify the balancing between cells (and in case blow up a fuse or something similar). ...
0
votes
2answers
367 views

What is the connector on lenovo ideapad miix board called?

The connector on board of keyboard of lenovo ideapad miix 300-10iby tablet. Male part: Female part:
-5
votes
1answer
158 views

Intellectual Property of Laptop Connectors

I want to know if all the connectors of the laptop have intellectual property or copyright, I do not know how it would be said in this case, or only those modified by the companies for their specific ...
0
votes
1answer
2k views

Can 12v destroy a laptop instead of 11.1v

I am making some experiment on the 18650 battery, I learnt that their charging voltage is 4.2v while nominal voltage is 3.7v. I made a 2ways parallel connect of 3 serial connection just like the ...
2
votes
3answers
143 views

Pulling analog DC output from a laptop

I am using a laser source that can accept analog input (0-5 V) to set light intensity levels. The input impedance of this driving voltage is 50 Ohms. Typically this is connected to a function ...
2
votes
2answers
817 views

Grounding a laptop through the DC-jack?

I would like to reach zero potential difference between me and my laptop (to avoid ESD) before opening the back cover. I'll connect my wrist strap to a common ground point, thru a resistorized coil ...
0
votes
1answer
101 views

Unknown Litium Ion Batterys [closed]

i have a laptop battery pack which i took apart and kept the batteries, hoping to make a battery bank, but the problem is i cant find any info on the batteries, they are all red and have a green mark ...
7
votes
2answers
4k views

Is there a standard I2C/SM bus protocol for laptop battery packs

I'm building a laptop with a custom battery pack. I know that the pack has to communicate through an I2C/SM port on the motherboard, but I don't know how to make the bios/os recognize it. Is there a ...
0
votes
1answer
246 views

Why fully cycle Li-Ion laptop battery?

The manual for my new laptop clearly states that partial charge cycles of it's (Li-Ion) battery should be avoided. It recommends to always discharge to automatic shutdown and then charge back to 100% ...
3
votes
0answers
254 views

Offical Name of Dell/HP Common Laptop Power Jack/Plug [duplicate]

I have seen this question asked before, but never has it gotten a real answer. With the popularity of this plug I find it hard to believe it does not have a standard name or IEC name. Does anyone ...
-3
votes
1answer
112 views

Smartest way to make an 180w SMPS?

So i own this gaming laptop (MSI GX60) which draws a lot of power, the original charger i had recently broke, and i new one. But with that kind of power it costs around 60$ which is a bit much money ...
0
votes
2answers
4k views

Plug in charger in laptop before plugging in mains outlet [duplicate]

Feel free to delete the question if doesn't fit here. Somebody told me, that a person should plug the charger in the laptop side first, then in the mains outlet, as if there is a current peak, it is ...
1
vote
2answers
4k views

charging a lead acid battery bank with a 19v laptop charger

I am new to the forum and I notice that you have decent positive discussion and tips which also includes noobs on any given electrics related topic, I was requested to post it as a new question here: ...
1
vote
2answers
267 views

Charging multiple laptop batteries

I want to build me an electric longboard, and I was planning to run it off of 4 or 5 11.1 volt laptop batteries... I want to wire them in parallel (The sets of 11.1 volt), and charge it as one big ...
0
votes
1answer
1k views

Using a laptop charger with the wrong polarity? [closed]

I just bought a replacement charger for my Fujitsu Lifebook AH532, but it seems like it has the wrong polarity. The backside of the laptop has a label saying it should be like this: https://imgur.com/...
0
votes
1answer
266 views

Laptop Charger Failure during AC supply undervoltage

My Laptop Charger is rated 240V AC Voltage. While plug in the outlet the undervoltage occurs (using multitester) the voltage is 107V. At that instant my charger is very hot, right now my charger is ...
2
votes
2answers
1k views

laptop battery connector name [closed]

I want to know what is the name or family name of the laptops' battery connectors? I want to replace a broken connector but don't know what to search for on digikey/mouser. Image of connector below: ...
0
votes
1answer
2k views

Power a laptop from 12V Battery using DC-DC Step Up Circuit

I have following items 1) DC - DC Step Up Boost (150W) http://www.ebay.in/itm/131625051992 2) 12V 12Ah Battery (Sealed Lead Acid Battery) 3) LCD Lead-acid Battery Capacity Tester I charge my ...
0
votes
2answers
26k views

connecting a hp laptop charger adapter three wire output to a two wire cable [closed]

My laptop charger adapter broke and I a have this other old adaptor in the house. They both have the same voltage(19V) and 1.58A. The first adapter(The one that broke) has three wires (black, white, ...
1
vote
0answers
6k views

Identifying shorted capacitor on laptop motherboard

Background: My Asus U47A laptop stopped charging or running off the AC adapter. With the help of diagnostic tips on the internet, I found the culprit to be a faulty ceramic cap near the input jack ...
0
votes
1answer
666 views

Laptop to “Desktop” Conversion [closed]

I have an old laptop which I no longer have the charger for. I ordered a new charger for the same laptop series, but the plug is too large, and it is unlikely that I will find the same adapter (Acer ...
1
vote
1answer
62k views

LVDS 30 pin cable confusion [closed]

I'm trying to salvage a Samsung LTN154AT07 LCD from a laptop. I've ordered an MT6820-B rev.3 universal LVDS driver and a 5A step-down module (XL4005), and I think I have a decent grasp of how ...
0
votes
1answer
104 views

Is it wrong to charge a laptop/cellphone battery when the device is on? [closed]

I always try to charge my laptop or my smartphone after turning them off. I feel that leaving these devices charging when they are on could be detrimental to them. But... is it? And whether the ...
1
vote
1answer
2k views

What protection circuits do laptop batteries come with?

I am currently using an old lithium-ion laptop battery pack for my portable sound system. The battery seems to work pretty well for its age. I simply hooked up a cable to the positive and negative ...
1
vote
4answers
181 views

Why aren't there electric cars with solar cells built on top of them? [closed]

I think it would be nice if leaving the car outside on a sunny day would charge up the batteries. It would make possible long-range weekend trips to the countryside because during the 2-3 days of ...
0
votes
1answer
841 views

Wire laptop power switch to another switch

A little background to my question: I got a laptop some time ago from my grandparents because the screen was broken and they didn't want to fix it. Being your typical tech geek, I already have a ...
12
votes
6answers
4k views

Desoldering a tricky DC jack

I'm trying to replace a faulty DC power jack on a laptop, and having quite a difficult time with it. At this point, I'm not sure if the problem is with my equipment, or my technique. Equipment: ...
3
votes
1answer
389 views

Convert SLA laptop battery to NIMH

I have an old laptop that uses a SLA Battery and I'm wondering what sort of circuit would be need to convert the charging circuit for NiMH Cells. Many manufacturers were able to do some time ago but ...
3
votes
2answers
2k views

Can I produce a square wave(basically a clock) from a USB port on my Laptop? If yes how?

Can I produce a square wave(basically a clock) from a USB port on my Laptop? If yes how ? Briefly explaining, I am using ad9834 in a project and this chip needs a clock of any frequency ranging ...
1
vote
2answers
2k views

How to feed custom RGB Led keyboard backlight

I have found a lot of topics but none of them describe what I want to use it for. Basically I want to put 104 RGB Leds under my laptop's keyboard and be able to control them individually. The ...
2
votes
2answers
2k views

Does a sound card low pass filter input?

I ask this question just because I'm curious to find out. As far as I understand, the Nyquist theorem says that the sampling frequency must be at least twice the bandwidth of the signal to be sampled....
2
votes
1answer
4k views

Alternative to lead-acid battery on power wheel toy

This might be a silly question, but here I go. My son’s power wheels car battery (12v 9.5Ah lead acid) is gone and, here in Venezuela, they are pretty difficult to find, not to mention the high prices....
-1
votes
1answer
634 views

Charge LiPo 5S with 18.5V laptop power supply

Is it possible to charge 5000mah 5s lipo pack with cheap $10 HP laptop power supply without special LiPo charger? Just by connecting the leads. The charge rate would be less than 1C. Power supply is ...
1
vote
1answer
1k views

How can I drive this laptop screen?

How can I drive this screen? It's a 1920x1200 display from an old Dell Inspiron 6000 which is now dead, but the screen is great and I want to use it in a project. Is that a standard (either physical ...
-7
votes
1answer
172 views

Is It Safe To Turn On a Dropped Laptop [closed]

My mother threw my Macbook out the windows and it landed on a flower pot. It has stayed intact however I'm reluctant to turn it on at risk of the hard drive getting damaged. Is it safe to power it up,...
1
vote
1answer
8k views

Laptop battery not working after replacing cells [closed]

I have a Sony VGP-BPS21A battery that I use to power my laptop. It is really old, like 5-6 years now and its cells have lost more than 50% of their capacity. As a new OEM is very expensive, hard to ...
-3
votes
1answer
984 views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
0
votes
2answers
4k views

Estimate minimum discharge voltage in a laptop battery

The objective is to determine the best 18650 cells to replace the ones in my laptop battery. To do that, I need to know the minimum voltage the battery controller accepts before ordering the OS to ...
0
votes
2answers
673 views

Replace 5-pin push button in my laptop [closed]

I have a 5 pin push button in my laptop, that doesn't work. I have to replace that button, but in my town I don't have any in stock and I can't wait for the delivery from China. How can I replace ...