Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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42 views

Laptop Died :\ voltage fluctuation [closed]

Yesterday my Laptop died. There was a motherboard shot (a capacitor got burst and leaked, a mosfet was shot ). It was working fine when it was on battery without charger plugged in . Then plugged in ...
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2answers
248 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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77 views

How does a laptop barrel port adapter work and is mine faulty?

This might be a difficult question, so thanks in advance for reading. I've bought a Female 7.4 x 5.0 mm to 4.5 x 3.0 mm Male adapter for my new charging brick. This new brick should work with my ...
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0answers
56 views

Need help identifying the 4 microphone wires in my laptop webcam

I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
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5answers
98 views

what do the colours of the wires on stereo speakers signify from old TVs and laptops? [closed]

I have a few laptop and a TV stereo speakers salvaged from old electronics in my possession and I have noticed a pattern that I cannot understand. Both the left and right of these speakers have two ...
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2answers
934 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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161 views

How can i reset the laptop battery BMS?

I have my laptop Acer Nitro 5 AN515-51. But suddenly the laptop didn't turn on and only turns on when the power adapter is attached, so i checked the bms output voltage with my multimeter and it was 0 ...
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1answer
68k views

LVDS 30 pin cable confusion [closed]

I'm trying to save a LG LM270WQ1 from a imac 2010(?) I want to order an MT6820-B rev.3 universal LVDS driver, or kinda (because the one that is suggested for this screen is very expensive driver ...
6
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3answers
4k views

Do phone chargers communicate with the phone?

I have come across multiple YT videos (about the new higher USB power delivery and battery degradation) mentioning that chargers communicate with the phone or laptop when charging to avoid battery ...
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1answer
39 views

Charge Threshold on a Laptop

I have a feature called charge threshold in my laptop (It's pretty common for laptops to have them these days), it's like you set a limit to how much your battery gets charged once that limit is ...
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91 views

Can somebody give me a technique to power a laptop with AC to DC supply with connection to laptop battery pins

It's my first question here please bare my language and long paragraphs. I have this lenovo R400 it was running without battery for 7 years. All of a sudden it turned off and didn't show any activity. ...
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1answer
237 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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2answers
379 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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68 views

Should the ground prong in an AC power cord carry current?

When I use a test light on my laptop charger's head, it turns on. That means it is shorted somewhere, right? I used a 3 prong to 2 prong connector and inside it I connected the prong in the image ...
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0answers
40 views

How to detect pinout of trackpoint (probably ps/2) module?

I have following trackpoint module of recent thinkpad x390. There are some info about older modules, most useful(combined) one is: https://deskthority.net/wiki/TrackPoint_Hardware However, i found no ...
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1answer
178 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
53 views

Is there a way to utilize a old screen using electronics that can be handheld?

So, I guess this is a follow-up question to my previous one: Is there a way to output high quality pictures to a monitor with VGA using an Arduino?. Obviously, the answer did help me to get rid of the ...
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1answer
42 views

ASUS Laptop A/C Power Supply Output Doubled

My laptop power supply is rated for output to 19.5v, 7.7A. However, it's kicking out 41.5v. Strange thing is that before I measured this voltage, I have been using it to power on my laptop and it ...
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1answer
98 views

Is it normal to have around 40 V in your body, when touching your plugged, ungrounded laptop?

I have had bilateral shoulder pain and then both arms and hands pain for around 7 mounts, which got much worse when I started working from home, with my laptop. The ultrasound of shoulder muscles ...
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82 views

BTA16 (snubless version) triac was killed with 02 laptop adapter, please advice on how to overcome!

I found some threads asking on inductive load for triac can kill the triac with over clamping voltage, however, the thread is no longer open so let's me make a question here with a hope that the ...
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1answer
43 views

Using a plug-in timer to extend the lifespan of a laptop battery

My 3.5 year old laptop is suffering from a swollen battery despite having completed only 100 cycles. It's been plugged in for at least 18 months, which I read likely contributed to its degradation. I'...
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3answers
52 views

Danger to laptop due to fan malfunction even with cooling pad? [closed]

My laptop fan makes noises that indicate to me that it is failing -- if I accident nudge it abruptly, it can become very noisy and even make a loud buzzing noise before it seems to shut off although ...
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0answers
34 views

Laptop's removable battery has 4 18650 3.7v cells in series, can I attach 8 more as external battery pack as 4s2p?

I have 4 years old HP gaming laptop with removable battery. I never kept the battery in the laptop. Right since the purchase, I stored the battery in a sealed pack in cold place, and charged it to 45% ...
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63 views

HP Pavilion connector identification

It is from an HP Pavilion x2 Detachable 12-b010nr 12" Laptop and I need to replace the connector, because one of the pins broke.
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0answers
91 views

No voltage at battery terminals

I replaced the cells on my Laptop unfortunately disconnected BMS while doing so. HP battery check says each cell voltage and Temp correctly and calibration warning but can't calibrate as no terminal ...
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4answers
5k 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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55 views

Controlling multiple switches using voltage

I want to use my laptop with the lid closed and be able to press its function buttons (including power on/off), i.e. shorting their pins, using a wired "remote control" with the same amount ...
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0answers
40 views

Using a li-ion battery instead of an AC adapter

I have a board that uses a 19v 3.42A AC adapter as a power supply and I want to replace that with a Li-ion battery. What should the voltage of the battery be? I ask this because my laptop for example ...
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2answers
517 views

Recommendations for building a dedicated external speaker from an older computer

I'm super excited to jump in and learn more about building an external stereo speaker from an older salvaged macbook laptop. I loved using the laptop to reference how my music sounded to get a better ...
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1answer
119 views

AC 50 Hz noise from an unplugged laptop?

I am now wondering how a laptop is powered when it is on battery. Let me give you some context: I am using a Mac Book Pro (with an aluminium case) for measurements with a very low signal to noise ...
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0answers
76 views

Winbond v/s ITE chip

My ASUS motherboard has both a winbond 25q64fvsig and a it8995e-128 chip. In a repair shop in a country I was at the time, they flashed the wrong ASUS BIOS version. I tried flashing the right version ...
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2answers
403 views

What is this black tape on my laptop's keyboard?

I am trying to replace the keyboard on my 2019 Samsung Notebook 9 Pro. I had to pull off a layer of black tape on the old one to get it out. The tape was glued to the bottom of the keyboard, right ...
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2answers
1k views

Can I clip an antistatic wrist band to an extension cord ground pin plugged into my wall outlet for laptop work? [duplicate]

I've done some small laptop stuff without the wrist strap, but I might replace a logic board of a MacBook and will be working on it for a long time. I have wrist straps and might as well use one. I'm ...
2
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1answer
107 views

What models and brands can I find for logic fuses?

I'm trying to find logic fuses like the ones found here. As I'm new user, I couldn't comment there, so I created this new question. That fuse, in my case, is on a Clevo P170EM battery. This battery ...
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1answer
72 views

Which insulating tape and when?

There are quite a few tapes out there, from the plain black electrical tape to different color variations to Scotch 33+, 77, 88 to Kaptons (polyamide), I have also seen some velcro type wraps which ...
2
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1answer
1k views

Hacking Dell charger to run directly from an external 19.5V power source [closed]

I needed to power my Dell laptop without having 220V (because my inverter is burnt in the middle of nowhere) in my van. By using a boost converter that can deliver the required power, I simply set the ...
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0answers
31 views

help verifying battery schematic

The diagram below is for wiring up a 6 cell laptop battery. Visually, there are four batteries in one row, and two batteries in a second row. The cells are the usual 3.7v 18650 cells. I am pretty sure ...
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0answers
51 views

Inside of Razer USB-C Charging Cable Layout

maybe you can try and help , i got Razer Blade Stealth 13.3" QHD+ Touchscreen Ultrabook, my charger that is 65W with 20v with 3.25a for 20v,was broken at the end of the conector at the end of the ...
2
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2answers
4k views

18650 Li-ion cells for the laptop battery: with protection circuit or not?

My laptop battery died and I've took it apart to replace the cells inside. Do I have to buy new cells with protection circuit or without it? Googling the existing cells part number LGABC11865, I've ...
2
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4answers
575 views

Using different 18650 to repair laptop battery

Background: I have a laptop with a bad battery. Upon opening it up and testing the six 18650 cells that make up the battery, I found one to be completely discharged while the other five were still at ...
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0answers
47 views

Using 2 laptop power supplies to make plus and minus supply

I have set of M audio AV30 speakers that had a failed power supply (the transformer). I replaced the transformer with the closest thing I could find. The original transformer had a metal shroud ...
2
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1answer
173 views

Can I replace the original laptop battery with an OEM battery with higher voltage / power?

My original laptop battery is 11.1V and 74 Wh. It was starting to swell and needed replacement, but I bought accidentally bought a wrong OEM battery that is 11.4v and 71 Wh. Is it safe to proceed and ...
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3answers
199 views

FPC Connector - Matebook X Pro

Please excuse me if this is not the right place to ask this question. I have been looking for a specific ribbon cable (motherboard to LCD board) for my Huawei Matebook X Pro for more than a year now ...
3
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1answer
99 views

Will this DC UPS with off the shelf components for home network and laptop work?

I am trying to build a DC UPS to power modem, router which have power requirements of 12V 2A and a laptop which has power requirement of a 20V 3.5A. I am planning to use a AC to DC SMPS which is ...
1
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1answer
82 views

Which parts of this U.FL laptop wifi antenna need to be exposed?

I got these wifi antennas for use in a small metal computer case. I'm cutting some holes in the case to give the antennas exposure, but I'm not sure what parts of the antenna need to be exposed. As ...
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2answers
45 views

What voltage should DIY laptop external battery have?

I want to make an external powerbank for my laptop, since its battery cannot be removed (MSI GP62M 7RDX). What voltage should my battery have? 18650 elements have nominal voltage of 3.7. My laptop ...
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2answers
255 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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2answers
610 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
75 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 ...
1
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1answer
114 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 ...