Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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1answer
64 views

Did I Kill My Laptop? [closed]

My laptop takes a 19V adapter but I accidentally plugged in a 12V adapter and the laptop started smoking. I unplugged it after about a second. I read that if the polarity is correct and the voltage is ...
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1answer
74 views

Laptop HDD (100565308 Rev A) BIOS chip swap - chip won't come off?

I'm attempting to remove a BIOS chip from a Seagate Momentus 7200.4 HDD with a 100565308 Rev A chip number. I've followed videos ...
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1answer
61 views

Can someone help me establishing the polarity of this dc jack on my laptop motherboard?

So my laptop charger port is fried and I wanted to establish the polarity of the points on the board so I can solder a off the shelf jack instead of the original one which is not available anymore. I ...
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47 views

What does this chip do? And I want to get a datasheet - Top markings include: Analogix ANX6212

What does this chip do? Top markings include: Analogix ANX6212 And I would like to get a datasheet, if possible.
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1answer
31 views

How would you connect a LVDS display to a laptop motherboard supporting natively a different display?

I'm planning a project of building a 4:3 laptop based on existing (modern) components. As 4:3 displays are not manufactured anymore the idea is to take one from a old laptop, like a thinkpad T60. Then ...
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1answer
27 views

Turn on led backlight without a laptop

I'd like to turn on a broken laptop LED backlight without laptop and use it as light panel. How can I do it? Thanks
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0answers
27 views

Laptop charger voltage decreases gradually when plugged in, laptop won't charge

Recently, I tried to charge a laptop I had not used in a long time, but it didn't work. I took out a multimeter and measured the voltage coming out of the laptop charger, a Delta Electronics charger ...
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36 views

Is it normal to feel shocks on corner of laptop

When working on my laptop connected to power and lightly touching the right corner with my forearm, I can feel small shocks which are uncomfortable, almost painful. Is this normal? It happens under ...
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1answer
59 views

Without the use of any software, what would be the cheapest way to connect my broken laptop's keyboard to my desktop?

I am trying to use an old keyboard from a laptop as a new set of keybindable keys for my desktop. I will worry about software side later what I need here is this: How can I use the keyboard from my ...
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1answer
47 views

Safely powering Dell laptop from external Li-ion battery with a 11.1V/19.5V step-up converter

I need to build a power-bank type device for my Dell Latitude 6530 laptop (19.5V, 90W nominal power input). I have 12 Li-ion 3.7V, 3.35Ah (18650-type) cells, 3S4P configuration (11.1V total output). ...
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1answer
68 views

Do new laptop batteries require charge cycles before reaching full capacity? [closed]

I have purchased a new battery for my hp pavilion dv6500 laptop. The description in the shop read that it should be a new battery. Using Fedora OS, I did ...
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1answer
63 views

LCD screen: can this problem be caused by the inverter?

I'm repairing a HP 530 laptop with bad screen image. The image does not flicker, the corruption pattern is static. If I connect an external monitor through the VGA port the image is fine, therefore I ...
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2answers
103 views

Charging a USB C device with fixed voltage / No Power Delivery/ Fixed dedicated Source

I have a lenovo yoga 730 13-ikb without a charger, it uses TYPE C usb charger with PD specifications for the charger in online stores are: AC Input: 100-240V ~ 1.5A 50-60Hz DC Output: 20V 3.25A (65 ...
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1answer
105 views

I took a old webcam from a laptop and connected it over usb, it does not work [closed]

The camera has 5 pins: 5v, D-, D+, GND and powerC. I dont know where to plug power c in. Can someone help me please, the camera is CNF9138_A1 By Chicony
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3answers
78 views

Using laptop charger with slightly higher voltage

I am wondering if it is safe to use a MacBook charger on my Lenovo laptop. Both devices charge via USB C PD. When looking at the voltages I can see that the Lenovo adapter is 20V - 3.25A The MacBook ...
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1answer
52 views

How to identify notebook motherboard parts that don't have meaningful description? [closed]

Recently I was trying to fix flooded laptop - Dell Inspiron 5370. After disassembling the motherboard (named ARMANI13) I noticed rust on one of the chips. Its location and surrounding elements suggest ...
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1answer
51 views

Why does (my) NUC/Laptop use odd (19V) power supply voltages?

Nothing comes to mind that really needs exactly 19V, with USB-C on board which can provide 20V it seems even a bit of a drawback to step up the voltage rather than increasing the PSU voltage.
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1answer
53 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
653 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
122 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
53 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
180 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
47 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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0answers
45 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
121 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
65 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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26 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
62 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
62 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
146 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
119 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
304 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
54 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
315 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
116 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
159 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
88 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
2k 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
624 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
224 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
385 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
109 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
690 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
895 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
490 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 ...