Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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Laptop battery "extension" / external connect?

I have rebuilt an old laptop of mine that wasn't working and its chassis broken. In a nutshell after replacing the damaged components; I mounted the board and system on two acrylic sheets as shown in ...
ccot's user avatar
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Charging USB-C PD supported laptop from battery bank

Is there a way that I can change my USB-C PD supported laptop with battery bank? I have 3.7V 25000 mAH batteries bank. 5X (3.7V, 5000 mAH) batteries are connected in parallel. What sort of circuit ...
Zunuran Nasrullah's user avatar
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What might cause this strange pattern on an LCD monitor?

Recently my laptop has been showing a strange effect on its monitor: This is supposed to be a black screen, but the bottom fifth or so is affected by some kind of interference pattern. The pattern is ...
Rocketmagnet's user avatar
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Hacking laptop power button: Turn on laptop when AC's back (Asus F533 laptop)

My question is closely connected to this question: Hacking laptop power button: Turn on laptop when AC's back I was in doubt to reopen the discussion there, or start a new one. I choose the latter....
Eef Weenink's user avatar
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1 answer
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Can I charge laptop with wire 20awg

My laptop has a maximum power is 170W, 20V, and I often use it with max power. My adapter has a broken power jack and I must change the wire that supplies power for the charge. I use wire 20awg, the ...
Trà Nguyễn's user avatar
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0 answers
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How to make a recent laptop touchpad work on PC with an external PS/2 USB adapter

I want to make a laptop touchpad work individually with a USB adapter, but failed, on a recent Thinkpad E14 touchpad part. Some articles on the internet said they succeeded connecting the touchpad ...
sdrkyj's user avatar
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1 vote
2 answers
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Will this work if I'm using an anti-static wrist strap when repairing a laptop?

I was thinking that I would connect it to the ground terminal of the outlet (I live in India so it's the top one) but I'm scared of getting shocked because of a faulty ground point etc. So I was ...
Siraj's user avatar
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2 answers
166 views

Universal laptop charger on USB-C computer

I recently bought a new laptop that came with a USB-C charger, leaving me with a few universal chargers from my old laptop that do not have a USB-C tip, but have the power capacity to supply the 20V/...
Lowraxe's user avatar
1 vote
2 answers
363 views

Laptop connectors and universal chargers (tips M3, M4, etc.)

I am interested in having more information about connectors and identifiers (M3,M4,...M31) used by laptop universal chargers. Is there any "official" list or convention for laptop ...
Daniel Perez's user avatar
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HDMI > eDP 1.2 converter

I have a spare 15.6 laptop screen and want to turn it into a small portable monitor. By portable I mean that it should not require to be plugged into an electric socket. The screen itself only needs 3....
Ivan Schemm's user avatar
4 votes
1 answer
368 views

Why use two MOSFETs to switch the main power rail in a laptop?

I've been dabbling in laptop repair for a bit and at least for non-USB-PD laptops it always seems to be the same setup. Some inrush limiter coils, maybe a diode, smoothing capacitors and two MOSFETs ...
Peter Panda's user avatar
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Changed the battery cell, still not charging MSI GL63 8RC

Recently my laptop (MSI GL63 8RC) battery was dead, so opened the battery (6 cells) and checked the voltage of each pair of cells, it was 3.9 V, 3.9 V, 0 V, so I replaced the 0 V cells with working ...
kumaran subramanian's user avatar
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1 answer
71 views

Inject DC into output side of laptop power supply? [closed]

I have a HP omen laptop that operates on a 200 W 19.5 V power supply. I am currently lucky enough to live a nomadic life in a solar-powered travel trailer and try to run all my devices on DC rather ...
tpar0tro30's user avatar
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0 answers
35 views

what is this component ?5A_Z120_25M_0805_2P [duplicate]

hi what i should to write on google to find out this component 5A_Z120_25M_0805_2P is in my laptop. i try to find out on google but no info there is
sing Eminem's user avatar
1 vote
1 answer
99 views

Laptop charger (USB-C) kaputt, repair, substitute or buy new? [closed]

My laptop charging cable has a presumablyl slack joint and doesn't charge anymore. (It previously charged when you maneuvered the cable into a certain direction). I'm now contemplating these three ...
infinitezero's user avatar
0 votes
1 answer
47 views

How can the voltage of the original battery differ so much from the voltage of the original adapter?

It's about Xiaomi Mi Notebook Pro 15.6" 2019 JYU4148CN. The original battery has a voltage of 7.6V and a current of 7.9Ah, the total Capacity is 60,040 mWh. The original adapter has a voltage of ...
Anton Belsky's user avatar
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Calculation method used by MS Windows' powercfg/batteryreport

I'm working on the efficiency of laptops chargers, and I want to estimate it without damaging cables if possible. Therefore, I had the idea to use MS Windows powercfg tool, that provides us the energy ...
Benoit Bouckaert's user avatar
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1 answer
994 views

Dell laptop charger - is the data pin necessary?

In a P-12 dell charger there are 3 wires - blue, white and black. From searching Google I found out that the blue is probably for communication. Now, is it necessary to use the blue wire in order to ...
Aviad's user avatar
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1 answer
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What to set on Android/Windows laptop if I want to make them as slave?

I would like to control my Android smartphone/tablet or my Windows laptop using another Android/laptop or Arduino with HC-05 module. I want to control, such as, their volume, camera, microphone, and ...
AirCraft Lover's user avatar
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1 answer
113 views

What is the risk of splicing power from a charging wall adapter for a laptop?

I have a laptop that uses a 5V 3A wall charger. I have spliced some of that power to run an ESP-01/3V single channel relay... I'm estimating that takes about 300mA away from the 3A. I tested ...
Jacob David C. Cunningham's user avatar
0 votes
3 answers
572 views

Charging laptop with the DIY powerbank

I want to charge my laptop with DIY power-bank which has variable voltage output. Laptop peak consumption is 65 W and the power-bank has plenty of power to deliver it as it was previously used as ...
Markonioninioni's user avatar
0 votes
3 answers
163 views

Why isn't it easy to put an ampere-meter into any battery driven electronics?

I can buy a cheap multimeter which has an ampere-meter function. Great. Battery driven computer equipment like laptops and cellphones are complex, and for power / battery management I suppose an ...
Gunther Schadow's user avatar
2 votes
2 answers
657 views

Utility of shielding a laptop SSD with conductive foil -?

I recently replaced the factory SSD in my Thinkpad X260. The factory SSD came with one side covered in conductive aluminum foil which is grounded to the chassis via the caddy-screw attachment. The ...
Russ Bain's user avatar
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1 vote
2 answers
669 views

Reusing a HP laptop charger of 3 wires (logic inside)

I have an HP laptop charger 18.5v 3.5A (1X2057... WBGST0A...) In the past the charger was working fine and I removed the tip for an experiment, so I can't check wires measuring the original tip. Wires ...
Daniel Perez's user avatar
0 votes
2 answers
73 views

Can I use a power bank to power my laptop during a blackout? [closed]

I am wondering if it's possible to use my ThinkPad L430 laptop with a power bank as a power source during a blackout. The laptop's power consumption is between ~35 to ~42 watts. Its battery is always ...
Kira's user avatar
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3 votes
2 answers
601 views

I don't understand the directions of the arrows

In theory, in the image the current comes from page 41 through cable 51 on#, but if we go to page 41 the arrow indicates that the current is coming in and not going out as indicated in the second ...
marcos cespedes's user avatar
1 vote
2 answers
93 views

Which glue isn't detrimental to laptop electronics

Over time, I lost all four rubber feet that were under my laptop (Asus UX530U) and I want to replace them. The original ones used to stick to the laptop by having a little rubber pin plugged into the ...
runningwild's user avatar
1 vote
0 answers
159 views

Trying to replace laptop's dGPU with eGPU. Is it possible?

I try to replace GT 840 dPGU with eGPU on V3-572PG mainboard for which I have circuit and boardview. I'd desoldered dGPU. Then after study of boardview I could easy match pins from dGPU socket to pins ...
Daro's user avatar
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4 votes
2 answers
404 views

How can I safely replace laptop battery pack cells before removing the old cells?

Replacing lithium ion cells in an old laptop battery pack, I want to connect the new cells in parallel before removing the old ones to avoid the BMS locking (if it even would do that). The pack uses ...
Peter Buxton's user avatar
1 vote
2 answers
72 views

What is the connector on CR1220 laptop batteries?

I have an Asus Zenbook UX301L with a dead BIOS battery. I pulled the battery out and see that it's a CR1220 with spot welded wires and a white plastic connector. I am trying to find the specs of the ...
DanielSank's user avatar
0 votes
2 answers
264 views

Safety around old laptop batteries

I found an old laptop with a removable battery that hasn't been used it (probably) years, maybe decades. I want to plug it in to see if it still works, but I'm not sure if it's safe to do so. I either ...
Alex O'Connor's user avatar
-1 votes
2 answers
411 views

Could a faulty household electrical system be mildly damaging my two (same model) laptops' batteries? Mysterious laptop charging problems [closed]

I've got two laptops of the same brand and model. I got their two original chargers, which are the same model as well, with same specs. I've been living in my current apartment for 2 years now and ...
raquelhortab's user avatar
0 votes
1 answer
83 views

Is it dangerous to charge laptop from car batterry? [closed]

Can we use a laptop charging adapter without a car? Is it dangerous? Example: 12v car battery -> automobile auxiliary power outlet(car cigarette lighter) -> car adapter DC-DC with PD 12v to 20v -...
Ruslan Korolev's user avatar
0 votes
1 answer
56 views

I want to replace battery on my Acer Aspire ES1-111 and I'm having hard time choosing batteries online [closed]

-My original battery is AC14B13J---TYP3220mAh/36Wh---MIN3090mAh/34.5Wh---11.4V 3140mAh -The one I found online has the same description as my original battery, but it has an 11.55V 3180mAh. Is it okay ...
Ajova Memes collector's user avatar
0 votes
1 answer
104 views

Inverter output to power laptop

I would like to gather info on power requirements for an electric system for a caravan, but I struggle with basic understanding. My laptop needs to run off the 12 V battery, but the laptop charger has ...
Petr Kováč's user avatar
2 votes
1 answer
172 views

Laptop battery voltage exceeds label - what is going on?

I have a notebook main battery labelled HP (Hewlett Packard) CM03XL 716724-422 and 11.25 V and lithium-ion. This battery is a few years old. The measured output voltage is 13.0 V. Seems to be quite a ...
H2ONaCl's user avatar
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1 vote
0 answers
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What is the function of the PQ307 in this schematic?

I think it's some kind of feedback to the gates of PQ301 and PQ302 but, even so, the voltage at the gates would be equal to the sources and thus, the MOSFETs would be not saturated, right? I can't ...
Lázaro Guajardo's user avatar
1 vote
2 answers
2k views

What household objects can be used to connect anti-static wrist straps to while repairing a laptop

I need to open up my laptop for some cleaning and repasting. I watched some tutorials online on how to use an anti-static wrist strap and they all tell me to Have an extra desktop computer. Turn the ...
HullBreaker's user avatar
0 votes
1 answer
478 views

Can I replace a P labeled SMD fuse with a K labeled one?

I am fixing an "old" laptop and I needed to replace a broken screen. While disconecting and reconnecting the ribbon cable, I probably shorted something. Now the back light on both the ...
jst kiko's user avatar
  • 115
-1 votes
1 answer
360 views

Is it safe to use a laptop in an ESD safe environment? [closed]

I work in a highly sensitive ESD environment. I have equipment worth tens of thousands of dollars that can be damaged with a single zap. For testing purpose, I need to get my laptop inside this ESD ...
abunickabhi's user avatar
2 votes
1 answer
175 views

How smart are laptop power bricks for Lenovo Thinkpads? [closed]

I am wondering if there is something "smart" going on inside a standard Lenovo laptop power supply brick (often called “charger”) (X220 and X230 in my case). In other words, is there some ...
leggewie's user avatar
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0 votes
1 answer
851 views

AC adapter makes high pitched noise when a notebook is turned off or asleep

When I put my notebook into sleep mode or turn it off the notebook's AC adapter starts making a high pitched noise. When the notebook is on the adapter doesn't make any noises. Could anybody explain ...
Daniel's user avatar
  • 103
2 votes
2 answers
237 views

What is a subtle way to disrupt or cause interference to a typical laptop touchpad?

I know touchpads operate based on capacitance and using your finger to sort of complete a capacitor and track movements, etc. Is it possible to confuse or disrupt a touchpad using some other material(...
user avatar
0 votes
1 answer
74 views

What is the explanation for a haptic effect when tracing one's finger along a powered device's chassis? [duplicate]

I have a mid-2012 Macbook Pro Retina, and over the years I notice that when I wipe my finger along the surface of the chassis (like when wiping off dust), I sometimes feel a vibrating effect, a more ...
andyras's user avatar
  • 101
2 votes
3 answers
773 views

How fast does a 65 watt charger actually charge the battery cells?

My laptop (A thinkpad t440s) has a 6-cell battery: three pairs of 18650 cells in series, for a total of about 11 V. My charger is 65 watts at 20 volts, which works out to 3.25 amps. My question is, do ...
markasoftware's user avatar
2 votes
3 answers
325 views

Identification of a Lenovo W530 fan connector type

I have been trying to identify the black connector in the picture. It is from an older Lenovo W530 laptop fan made by Delta. Unfortunately it appears Delta doesn't have a data sheet (I asked them) and ...
Richard Baird's user avatar
2 votes
1 answer
126 views

150 Ah flat plate battery only lasts 1.5 hours

I have a 150 Ah battery with a 1000 W square wave inverter. I'm only using the inverter for a 4 ft LED tube light, a router, and a gaming laptop (Dell g5 15 5590). I was expecting the battery to last ...
Trax's user avatar
  • 129
-3 votes
1 answer
147 views

Can I charge my laptop with powerbank? [closed]

I have a Lenovo laptop with a L16L2PB3 lithium-ion battery. It has 4610mAh capacity which is enough for 3-4 hours of power. I want to have an ability to charge it when no sockets are around and for ...
Timur Zhukov's user avatar
1 vote
1 answer
75 views

What kind of laptop connector is this?

I accidentally yanked this cable while working on the LCD, and couldn't identify its function via google lens. It runs next to the LCD cable out of where the lid connects. It's on a hp probook 6450b. ...
slackexchange's user avatar
0 votes
1 answer
197 views

How is the power distributed in laptops when simultaneously charging and using? [closed]

How does my laptop charge as well as discharge at the same time? As far as I know, the battery cannot be charged and discharged at the same time. Please explain how the power is distributed when ...
Nerusu Viswanadh's user avatar

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