Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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2 answers
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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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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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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 answer
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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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2 votes
1 answer
72 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 ...
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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 answer
41 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 ...
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2 votes
2 answers
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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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1 answer
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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 answer
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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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2 votes
3 answers
84 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 ...
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2 votes
1 answer
105 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 ...
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-4 votes
1 answer
99 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 ...
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1 vote
1 answer
70 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. ...
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1 answer
62 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 ...
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4 answers
75 views

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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2 answers
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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 answers
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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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1 vote
2 answers
92 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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1 answer
75 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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-1 votes
2 answers
54 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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1 answer
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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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-3 votes
0 answers
85 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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2 votes
2 answers
114 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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1 vote
2 answers
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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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2 answers
137 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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-1 votes
2 answers
45 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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0 votes
3 answers
78 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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3 votes
0 answers
123 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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2 answers
172 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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0 votes
5 answers
130 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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0 answers
3k views

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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0 votes
1 answer
56 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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6 votes
3 answers
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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0 answers
122 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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0 answers
73 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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1 vote
1 answer
152 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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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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0 votes
1 answer
55 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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0 votes
1 answer
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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0 votes
1 answer
157 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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0 votes
3 answers
103 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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0 answers
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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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0 votes
0 answers
177 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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0 votes
0 answers
67 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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0 answers
257 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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0 votes
0 answers
58 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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0 votes
0 answers
46 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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1 vote
2 answers
529 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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