Questions tagged [laptop]
Portable personal computer, normally with a foldable chassis
223
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Real-world requirements of a laptop power supply [closed]
I've got a gaming laptop which comes with an enormous 330w power brick. I'd like to buy one of the GaN power supplies which started shipping with a newer version of the same machine to make my ...
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What type of mosfet is on the laptop's BMS? [closed]
I have an Acer aspire a515-41g laptop. Recently I open it and found out that the battery does give any voltage, so i tried to found the problem on the BMS. However i discovered that one mosfet had ...
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2
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60
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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 ...
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3
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2
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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 ...
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2
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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 ...
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108
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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 ...
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4
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2
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139
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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 ...
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2
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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 ...
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2
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64
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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 ...
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2
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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 ...
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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 -...
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1
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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 ...
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1
answer
50
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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 ...
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1
answer
117
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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 ...
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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 ...
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2
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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 ...
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119
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Battery connector name 8 pin pcb
I hope you can help me. I was cleaning my laptop, it's an asus rog gl703 (I'm a programmer) changing thermal paste, etc. and I had a big problem, the battery connector broke without realizing it. ...
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1
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196
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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 ...
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1
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210
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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 ...
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1
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134
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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 ...
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help identifying laptop connector (For Repair)
I was trying to repair my laptop's keyboard because some of the keys don't work anymore.
but in the proces of removing the boards i broke the male end of the power connector on the pcb. (the plastic ...
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1
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254
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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 ...
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2
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131
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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(...
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60
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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 ...
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1
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283
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How fast does a 65 watt charger actually charge the batteries?
My laptop (A thinkpad t440s) has a 6-cell battery: three pairs of 18650 batteries in series, for a total of about 11V. My charger is 65 watts at 20 volts, which works out to 3.25 amps. My question is, ...
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3
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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 ...
2
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1
answer
117
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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 ...
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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 ...
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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.
...
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1
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106
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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 ...
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4
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If I make a power supply with the correct voltage, will the device automatically draw the correct current?
I lost my laptop power supply, and was wondering how it would be possible to make one. It needs 19.5V (Alternating current) and 3.9A so 75 Watts or so. My question is once the 110 or 230 V wall power ...
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275
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'Tingling' feeling when using ungrounded Macbook Pro - Safe thresholds [duplicate]
I've noticed an oft reported 'tingling' sensation when using my Macbook Pro and was curious to measure how much electricity was running through my body while using the laptop plugged in like so:
...
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2
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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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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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160
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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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2
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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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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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0
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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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2
answers
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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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2
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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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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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345
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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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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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3
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202
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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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1
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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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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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5
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201
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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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How can I reset the laptop battery BMS?
My laptop is an Acer Nitro 5 AN515-51.
The laptop won't turn on - it only turns on when the power adapter is attached. I checked the BMS output voltage with my multimeter and it was 0 V, but each ...
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1
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80
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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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3
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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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