Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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0answers
14 views

DC Jack working (pavilion g7 )

I have restored a hp pavilion g7. Establish that the laptop is not receiving power at any time, the dc jack LED is not lit. Is there security here? Have already searched a lot on google. Why do the ...
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1answer
35 views

Charge a laptop without explicit USB PD capability using USB PD

I bought a new laptop, the Xidu Tour Pro. It came with a quite bulky 19V 2.1A power supply that I'd like to replace. One review at a respectable site claims that the computer charges just fine through ...
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1answer
49 views

Bypassing the charging circuit on a laptop motherboard [closed]

My girlfriend has an Asus X540N latptop, an horrible machine, she spent a lot for a computer less powerful than a decent ten years old computer (she bought it before she met me :D)... Unfortunately ...
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39 views

Fix burnt USB port [closed]

I accidentally connected the 5V output of my arduino UNO with a 12V power adapter (I wanted to use a transistor as a switch for turning on some fans and touched the breadboard line). Unfortunately, ...
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1answer
505 views

Can Computer Motherboards Work Fine Even With A Damaged SMD Capacitor/Resistor?

I'm asking this because when I was replacing my laptop battery, I accidentally hit and broke/disconected one SMD capacitor off the board, then I turned my laptop on, it made some weird electrical ...
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1answer
42 views

How to determine the model/type of SMD Capacitor and EMI Suppression Filters on a laptop PCB?

I am a newbie to PCB electronic components and I have the following questions on SMD on a laptop PCB. The picture below shows the SMDs around a m.2 connector for SATA SSDs. 1) The SMD in the red ...
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1answer
43 views

Does my laptop need powerbank with output voltage the same like my charger's or my battery's? [closed]

I have laptop (Acer Aspire 7745G) which has charger 19V-4.74A and battery 11.1V - 6,6Ah (73Wh). I'm planning to buy powerbank for it but I don't know what voltage would be okay. I'm looking to this ...
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2answers
177 views

How much electromagnetic/electric radiation does laptop/computer emit? [closed]

How much electromagnetic or electric radiation does laptop emit? I don't know in what measurement system you have to answer, but at least, I want to get the answer which should be enough "research" ...
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1answer
43 views

is it safe or not to replace my old laptop battery's cells which can increase its Ampere hours from 6600 mah to 13200 mah? [closed]

My old laptop battery's total designed power is 6600 mah and if i replace its cells from Samsung rechargeable cells 3.7V and 2200mah per cell.it will increase battery's power from 6600mAh to 13200 mAh....
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42 views

Why would a battery BMS refuse to function after cutting off the wires and reconnecting them?

I tried to rebuild my laptop (Dell Inspiron 5537) battery pack with new Li-Ion cells so I removed the case, disconnected the cell wires and connected those wires to the new cells. After this point, ...
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1answer
1k views

Why do laptop batteries have so many terminals?

Why do laptop batteries require so many terminals (upwards of 10 or more!)? Why not just a positive, negative, and a data pin? All the phones I've used only have three terminals, and I would think ...
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1answer
92 views

Effect of submerging a laptop in isopropyl alcohol without removing batteries

It's common knowledge that water damage on many electronic devices can be mitigated using isopropyl alcohol at a high concentration. Many guides have mentioned disconnecting the battery before using ...
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2answers
46 views

How does an “auto voltage setting” laptop charger work? [closed]

I recently came across a very interesting device for me, a laptop adapter that claims it adjusts its output voltage automatically: https://www.trust.com/en/product/20194-plug-go-universal-90w-laptop-...
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25 views

Present information in coulomb counter in Windows/Linux

I'm making my own mini laptop using the innards of a compute stick clone. One thing that has me confused is how I should interface the battery monitoring to Windows in order to show it in the standard ...
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1answer
48 views

Powering high-power laptop from DC without inverter

Context: We live full-time in an RV (a travel trailer) while traveling around the US. We have 300Ah of 12V Lithium batteries, a 3,000W inverter and 600W of solar. Although we have an inverter, it has ...
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5answers
1k views

Laptop failure due to constant fluctuation of AC frequency and voltage [closed]

I spend most of time on a boat (not on holiday :/ ) where a huge generator provides electricity. The potential problem is that the output is very dependent of the "mood" of the engine. Sometimes the ...
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1answer
47 views

Using 12V to power a laptop which PSU is rated at 19V [closed]

I have laptop with a (dead)battery rated at 11.1V and a Power supply rated at 19V. I also have a 3s battery pack made with 18650 Li-ion batteries, meaning 11.1V nominal. Can I power my laptop ...
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1answer
139 views

Why are laptop computers usually powered around 20V DC? [duplicate]

Most electronic devices use 3.3V, 5V (all USB devices), 9V or 12V (very often for electronic music gear), and we usually all have dozains of such wall adapters at home. Even desktop computers have ...
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1answer
38 views

Where does a wire labeled “3G” must be connected in turbo x notebook? [closed]

I got angry and punched my Turbo x notebook and it shutted down. When I opened it again I got the famous error 0xc00000e9. So I thought that possibly a cable is disconnected or the hard drive is ...
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2answers
112 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
148 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
44 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
94 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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1answer
96 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
145 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
64 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
947 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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272 views

ENE KB9012 SPI protocol reflashing with parallel port

The story in short: I have a laptop which got bricked with a failed BIOS update, and it's ENE KB9012QF A3 KBC's embedded flash contents needs to be reflashed. Solutions I tried, but didn't work: ...
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1answer
504 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
958 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
197 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
259 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
93 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
511 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
562 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
1k 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
386 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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1answer
171 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
346 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
44 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
110 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
611 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
93 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
65 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
69 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
927 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
55 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
81 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
3k 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
969 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 ...