Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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1answer
48 views

Laptop using 3 times more power after restart/update [closed]

Voltage of my laptop battery ranges from 10-12 V. Current used to be arround 500mA. I hadn't shut my PC down for two months and one day after restarting it after an update I noticed battery draining ...
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1answer
69 views

Laptop won't power up, no sign of life. I suspected X-ray [closed]

I know it's very unlikely that x-ray device harm electronics. But I have a laptop lenovo z5070 , 7 years old it's still nice to use some basic purposes, I upgraded it with a SSD drive one year ago. 4 ...
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2answers
133 views

Can anyone identify this SMD?

I can't get any readings with my multimeter (it's probably blown up), and the board doesn't have any schematics. I've been searching the net for hours and can't find anything about it. It's the white ...
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0answers
56 views

I was really disappointed. Does anyone know this? datasheet for 3574A005 ? (with photo) [closed]

,,,naneun jeongmal silmanghaessda. igeoleul aneunsalam-
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2answers
79 views

How does USB-C powerbank know if I want it to charge or be charged? [closed]

A while back, I tried to use a USB-C powerbank (I think it was a Ravpower "PD Pioneer 20000 mAh, 60 W Portable Charger") to charge a laptop that was powered by USB-C (a new Lenovo). The ...
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1answer
47 views

Leakage current 2-pin usb-c charger [closed]

since I began using a 2-prong usb-c charger, i have noticed a vibrating sensation when moving my hand over the metal body of my laptop. If i ground myself, the vibration gets stronger. If I use the ...
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2answers
52 views

new arrived 7.5V tablet battery only measured 7.05V, is it a bad battery? [closed]

I am replacing my Surface Pro 4 battery. I bought a new replacement battery on eBay. Its spec is 38.2Wh 7.5V = 5087mAh. I measured with my multimeter today. It shows 7.05V. I noticed that one of the ...
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1answer
75 views

Could anybody help identify this connector?

Would any of you recognize the following connector ? It's on a old Dell laptop motherboard (M3800). It's to connect the led circuit from the lit keyboard. The flat brown cable from the lit keyboard ...
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0answers
83 views

Can I fix my fried notebook? [closed]

so I'm feeling sad today, as I fried my notebook. I took apart a SATA to USB device and soldered a connector to the 12v line, so I could use full sized HDDs with my USB adapter. I have already tested ...
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2answers
106 views

Calculating the required voltage supply [closed]

There is a Single Board computer that gives a range of input supply as xvolts - yvolts. Let's say we add a few more additional components like webcam or additional storage drive. Taking these into ...
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2answers
62 views

Laptop battery - Appliance class - Is it safe for ungrounded outlet? [closed]

I have some ungrounded receptacles in my house that are GFCI/AFCI protected. I wanted to check if my laptop (power brick) can be safely used on these receptacles. On the power brick I see this ...
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0answers
68 views

How to control a laptop CPU fan? [duplicate]

I have a spare laptop fan but I have no idea how to control (or even power) it. It has Red, Yellow, Blue and Black wires. I assumed red is +5V and black is your normal ground, but after applying 5v it ...
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2answers
76 views

Is it OK to power a laptop using a voltage regulator? [closed]

I am trying to build a power module to power my laptop using a 12V lead acid car battery. The output specs on the laptop charger read 19.0.V and 3.6 amperes. I have tuned a voltage regulator with ...
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2answers
41 views

Hardware switch toggles for laptop modules

I intend to take the camera, microphone, wifi and bluetooth modules inside a laptop, determine which pin provides them with power and then reflow the solder and bend that pin up so it is not in ...
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3answers
65 views

Is it safe to use a battery, which voltage is slightly different?

I'm going to replace the battery on my HP ProBook 4730s laptop. As far I know, it should be 14.4 Volt. However, when connected to the voltage tester, the replacement battery shows 15.58 Volts. Is that ...
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0answers
83 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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2answers
110 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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5answers
107 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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0answers
1k 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
48 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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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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0answers
95 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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0answers
72 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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1answer
117 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
59 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
49 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
100 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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1answer
106 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
86 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
50 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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0answers
123 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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0answers
66 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
186 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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0answers
56 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
44 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
525 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
137 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
87 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
528 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
2k 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 ...
0
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1answer
93 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 ...
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1answer
2k 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 ...
2
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1answer
119 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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0answers
35 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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1answer
96 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 ...
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4answers
654 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
58 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
343 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 ...
1
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1answer
93 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 ...
3
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1answer
132 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 ...