Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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2answers
122 views

Can anyone identify this capacitor?

I need to replace this capacitor on an Acer E5-571 Laptop motherboard. I'm trying to work out the ratings. I am no expert, but know enough to resolder a new capacitor. From what I have worked out, ...
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1answer
445 views

is it possible to get 20 volt 2a from 2 powerbank which have 5v ,2a 4x output?

is it possible to get 20 volt , 2 a from 2 power bank by connecting 4 usb port (each 5 v ,2.0a) . if can what should i use to prevent damage , short circuit , and catastrophic . i making a device ...
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1answer
61 views

How to make a power supply cable for a 10.5V 4.3A laptop OR how much higher voltage can I use

Let me preface this by saying I've spent countless hours researching and learning what I can about electronics before asking this, and I cannot find a clear answer to this. So sorry if this seems like ...
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3answers
596 views

Do I need a grounded electrical outlet for a laptop and computer monitor? [closed]

I am currently setup in a room with (2 pin) non grounded outlets (Canada). I am considering setting up my laptop and monitor. What risks would I be taking by not using grounded outlets with these ...
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2answers
164 views

Headphone Noise from Laptop SMPS

I have been facing an issue that has been a mystery to me for quite some time, and I wanted to see if someone here can potentially give me more insights on this so I can understand why it is happening....
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2answers
170 views

Grounding of IT equipment for office ESD protection

We've been having a lot of problems in my office with ESD. People touch cubicle frames and monitors shut off momentarily, painful shocks through laptops, etc. I'm worried about equipment getting ...
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2answers
110 views

Use lithium ion car jumpstarter to charge netbook? [closed]

I have a Gooloo car jump starter pack. https://www.amazon.ca/gp/product/B06X9R8QSY Can I use it to charge a small Gateway Nav50 netbook? What kind of adapter would I need? I suppose I could use ...
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3answers
3k views

Charging 2 12V batteries with a 19V 3.42A laptop charger

I was wondering since the voltage of my laptop charge is too high to charge one battery, it occurred to me if it could be possible to make a parallel or series arrangement to get my 2 12V batteries ...
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1answer
720 views

Charging my laptop via powerbank, it worked! [closed]

First of all let my say that i'm NOT an electrician or an electrical engineer. i'm just a guy who wanted to be able to chagre my laptop via my powerbank and this is how i did it. The power bank i ...
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2answers
1k views

Is it possible to convert 19.5V 3.33A to 12V 5.5A?

I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
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0answers
239 views

Replacing 18650 Cells in a laptop Battery

Is it possible to reconstruct a battery of a laptop with better quality 18650 Cells than that are used by the OEM Manufacturers. eg i have a MSI ge62 6qf with rubbed off LG cells so i cant tell what ...
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2answers
479 views

Why does my laptop emit electromagnetic radiation when charging (only)? [closed]

I have an electromagnetic radiation detector that I've been playing with recently, going around the house and testing various appliances, and I noticed something weird. When I charge my laptop (or ...
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1answer
129 views

Identifying 6 pin SMD 23ALB7

I need some help identifying these SMD . 23ALB7 with 6 pins. They are found on a laptop TOSHIBA SATELITE L650.
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1answer
886 views

Why are input MOSFETs in Laptop power supply always in pairs?

For example, on https://youtu.be/CW87dyYIimE?t=340 (and related work on motherboard), it says the managment chip uses two MOSFETs as a switch (as overheat protection, emergency poweroff on 10-second ...
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1answer
1k views

Function of the Third Pin Inside Laptop Barrel Connector

So I've been doing research on barrel pin connectors, and have been trying to apply this knowledge to understand laptop barrel connectors, specifically. My confusion relates to the function of the ...
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3answers
2k views

Is the voltage supplied by an LCD backlight inverter in a laptop dangerous in any way?

It is my understanding that in a laptop, voltage from a low voltage (say 10V) battery can be converted into higher much higher voltages by way of inverter for an LCD display module. Is this voltage ...
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3answers
526 views

Why aren't laptops with transparent displays a thing? [closed]

I just realized that the display on my 2012 Macbook Air is transparent. I had the screen brightness of the built in display on the lowest (off) while using an external monitor, and the sun came ...
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2answers
456 views

“Creating” a ground pin for my laptop

I am building a sensor using an Arduino connected to a laptop; I noticed that the readout is much more noisy when I use a non-grounded laptop (either running on battery or connected to a power socket ...
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2answers
764 views

My multimeter probes are too big to measure a laptop battery

I'm having laptop battery problems, and the hardware manual gave diagnostic instructions involving measuring the voltage in the battery. So I bought a multimeter (never used one before in my life) and ...
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2answers
47 views

Powering 3 identical laptops using a solar panel

I have 3 identical laptops rated at 45W and 20V. The combined wattage of all 3 is 135W. I want to charge these laptops via a solar cell. Do I go for a solar cell rated 135W 20V or one rated 45W 20V?
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1answer
128 views

Should I continue experimenting or not? [closed]

Good day to you all. I just accidentally stripped off the thin lining of metal that is found on the eDP cable of a Lenovo laptop (Lenovo IdeaPad 320-14IAP). The thing happened when I removed it from ...
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2answers
1k views

Laptop keyboard backlight ribbon cable broken [closed]

I've accidentally broke my laptop keyboard backlight ribbon cable when disassembling my laptop. I want to solder it back by patching with copper wires or maybe copper plates. My question is, it is a ...
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2answers
95 views

Voltage drop if power draw is too quick: Does it happen naturally or regulated?

If a laptop forced to drag out more current than the power supply can provide at the given voltage (i.e. 20 volts), the voltage does decrease, usually approximately anti-proportionally if I am correct....
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0answers
74 views

Why are 65W and 90W common amongst laptop power supplies?

I have seen Dell 130W, Lenovo 120W, some 230W or 210W gaming laptops, etc. . These are different numbers. But I have seen both 65W and 90W power supplies from Lenovo (65W 20V 3,25A with rounded DC ...
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4answers
85 views

Which capacity measurement is the correct way to measure?

So I've seen batteries showing their capacity in mAh and I've seen others showing in Wh. Phone batteries are always measured in mAh, while for some reason BatteryInfoViewer on my computer only shows ...
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3answers
1k views

Change laptop 5.5mm barrel connector [closed]

I'm looking to replace the female 5.5mm barrel jack connector on my laptop with a female USB C connector. The replacement USB C port need only provide power and nothing further. I'm not sure how to go ...
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1answer
56 views

Is it normal to detect voltage inside a disassembled laptop?

In this video I used a non-contact voltage detector and placed it in various points on the surface of the disassembled laptop chassis, behind the keyboard and touchpad. Overall there is not much ...
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2answers
88 views

What would be the safest method to power a laptop (IdeaPad 510 15isk) from a 14.8v battery pack?

Looking at my existing power jack and measuring it crudely with a cm ruler it looks like 3mm diameter x 1 cm length. The laptop bottom and charging adapter both say 20v @ 3.25 A max. What would be ...
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1answer
4k views

Is it safe to rebuild my laptop battery pack? [closed]

this is my first question on this website, so please excuse me if I did not follow the guidelines correctly. I have an Alienware 17 R1 (2014) and have been looking into rebuilding its laptop battery ...
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2answers
2k views

Calculating laptop power consumption [closed]

I'm trying to decide on a portable AC power station to power four laptops for at least five hours. I have the charger units for the laptops, and I'm confused on how to figure out the power consumption ...
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1answer
337 views

How can I properly read the voltage and amperage labels on consumer electronics? [closed]

I have a laptop with a short battery life that has a proprietary high amperage plug that I need to use in a car while that car is in motion, being driven by someone else. The proprietary plug rules ...
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2answers
513 views

When is using non-standard laptop chargers safe? and why? [closed]

Looking at using the charger for laptop A to charge laptop B results in a lot of different recommendations, so I am not sure what to believe in. Especially I find that many websites give ...
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0answers
28 views

Restore or replace an old NiCad battery

I was finally able to buy a used Toshiba T4700CT to play my DOS games. I cleaned it, disassembled it and replaced both the backup battery and CMOS battery, but I have a question regarding the main ...
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3answers
484 views

Replace MOSFET AO4433 With FDS6679 [closed]

Good day guys. This is my first time posting, hope you can help me a bit with this. My Sony Vaio laptop from 2009 has two damaged AO4433 MOSFETS near the power supply connector. I want to replace ...
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2answers
78 views

Safest way to store a laptop that's rarely used? Plugged in or not? [closed]

I have a laptop (mid-2009 MacBook Pro: aluminum, non-user-serviceable battery) that I almost never use, but might need in the future. The original battery was replaced by Apple a few years ago (The ...
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3answers
859 views

Disconnected laptop's internal mic, but sound-card is still picking up sound, why?

I have a HP Mini 5103. A security minded friend wanted me to physically disconnect the internal webcam and stereo mic, no problem as both are individually connected to the motherboard via a wire ...
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0answers
31 views

Software definable battery controller to be able to re-use various laptop batteries

I'm looking to retro-fit an older small netbook Toshiba NB100, by replacing the logic board with the single core Atom 1.6Ghz with an up-board core. A hardware/software solution for re-using the ...
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1answer
269 views

Can I program a Breadboard with a laptop? [closed]

I want to be able to program a breadboard with a laptop, male to male usb cord, powersupply circuit board (which has a usb in port) and breadbord. My question is, Will this setup work?? Basically ...
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1answer
12k views

Identify the pins of the circuitry that resides within a laptop battery [closed]

My ASUS laptop battery stopped working all of a sudden, when it had no reason to (new). Windows says "Plugged in, charging" , but the battery always stuck at 0%. Before getting a replacement battery,...
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4answers
73 views

Is it better to get a laptop from your country? [closed]

My knowledge about the inner workings of electronics is very limited, but I'm planning to move country that uses a different voltage system and I was wondering if it would matter if I bought a new ...
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1answer
48 views

laptop battery longevity / fear of burn out [closed]

i have asus t100ha, that i use it 24h a day, or better said i wish that icould, since my partner unplugs it due to extreme energy consumption fear. now the laptop has 2 lipo batteries, each being 3....
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1answer
215 views

May I replace ICR 18650 22F with 26H in Laptop battery?

As in the title, I have a worn laptop battery, made out of 6x SAMSUNG ICR 18650 22F. Now I can't find any 22F near me, nor slightly farther for a sane price. But SAMSUNG ICR 18650 26H are practically ...
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1answer
106 views

How to build EMF radiation protection [closed]

I've recently started to use my laptop more and more on my lap and I'm worried about exposire to radiation emmited by the laptop. I keep it at a distance of about 10cm but still... I was wondering if ...
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1answer
10k views

Using a usb-c laptop charger to charge a phone [closed]

I don't really know anything about electronics and I'm not sure if it's the right place to ask, but still. Is it OK to charge my phone with my laptop's charger? Here's info on the laptop charger: ...
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1answer
546 views

4A XL6009 DC-DC For Laptop Charging [closed]

I live in a place that suffers from electricity shortages, I have a 12V 20AH battery and I want to charge my laptop using it, rather than buying an inverter I thought it would be more efficient if I ...
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2answers
522 views

Lenovo Y580 battery - Panasonic NCR18650b MH12210

I am new to the group, so thank you for this great community. I am a student and "DIYer" and like to repair simple electronics. Anyway, so here is my situation: Want to repair my laptop battery as ...
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1answer
105 views

laptop battery care [closed]

Many people keep their laptops plugged in and charging when using them at home, and rarely if ever take them out of the home. This keeps the Lithium battery at 100% State Of Charge (SOC), which I ...
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2answers
161 views

Trouble finding how I can plug in this Molex connector from a Laptop Fan [duplicate]

I recently bought this fan, I am trying to power it for an external project that doesn't revolve around laptops; however, I don't know how to get power to the fan without cutting off the molex ...
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2answers
131 views

why my laptop can't use wireless charging technology? [closed]

we start to deal with wireless charging technology in recent years with the booming of smart phones why wasn't it possible with laptops? does the smart phone's battery differ from laptop's?
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1answer
139 views

Replace laptop's usb surge protection chip [closed]

I am fixing an old laptop from 2008 (eMachine e525) on which everything works fine expect the 2 usb ports that are not powered. I found this video¹ from Ingmar M. on youtube (very helpful video, ...