Questions tagged [laptop]

Portable personal computer, normally with a foldable chassis

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votes
1answer
2k views

Power a laptop from 12V Battery using DC-DC Step Up Circuit

I have following items 1) DC - DC Step Up Boost (150W) http://www.ebay.in/itm/131625051992 2) 12V 12Ah Battery (Sealed Lead Acid Battery) 3) LCD Lead-acid Battery Capacity Tester I charge my ...
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2answers
28k views

connecting a hp laptop charger adapter three wire output to a two wire cable [closed]

My laptop charger adapter broke and I a have this other old adaptor in the house. They both have the same voltage(19V) and 1.58A. The first adapter(The one that broke) has three wires (black, white, ...
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0answers
6k views

Identifying shorted capacitor on laptop motherboard

Background: My Asus U47A laptop stopped charging or running off the AC adapter. With the help of diagnostic tips on the internet, I found the culprit to be a faulty ceramic cap near the input jack ...
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1answer
684 views

Laptop to “Desktop” Conversion [closed]

I have an old laptop which I no longer have the charger for. I ordered a new charger for the same laptop series, but the plug is too large, and it is unlikely that I will find the same adapter (Acer ...
1
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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 ...
0
votes
1answer
104 views

Is it wrong to charge a laptop/cellphone battery when the device is on? [closed]

I always try to charge my laptop or my smartphone after turning them off. I feel that leaving these devices charging when they are on could be detrimental to them. But... is it? And whether the ...
1
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1answer
2k views

What protection circuits do laptop batteries come with?

I am currently using an old lithium-ion laptop battery pack for my portable sound system. The battery seems to work pretty well for its age. I simply hooked up a cable to the positive and negative ...
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4answers
183 views

Why aren't there electric cars with solar cells built on top of them? [closed]

I think it would be nice if leaving the car outside on a sunny day would charge up the batteries. It would make possible long-range weekend trips to the countryside because during the 2-3 days of ...
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1answer
1k views

Wire laptop power switch to another switch

A little background to my question: I got a laptop some time ago from my grandparents because the screen was broken and they didn't want to fix it. Being your typical tech geek, I already have a ...
12
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6answers
4k views

Desoldering a tricky DC jack

I'm trying to replace a faulty DC power jack on a laptop, and having quite a difficult time with it. At this point, I'm not sure if the problem is with my equipment, or my technique. Equipment: ...
3
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1answer
407 views

Convert SLA laptop battery to NIMH

I have an old laptop that uses a SLA Battery and I'm wondering what sort of circuit would be need to convert the charging circuit for NiMH Cells. Many manufacturers were able to do some time ago but ...
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2answers
2k views

Can I produce a square wave(basically a clock) from a USB port on my Laptop? If yes how?

Can I produce a square wave(basically a clock) from a USB port on my Laptop? If yes how ? Briefly explaining, I am using ad9834 in a project and this chip needs a clock of any frequency ranging ...
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2answers
2k views

How to feed custom RGB Led keyboard backlight

I have found a lot of topics but none of them describe what I want to use it for. Basically I want to put 104 RGB Leds under my laptop's keyboard and be able to control them individually. The ...
2
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2answers
2k views

Does a sound card low pass filter input?

I ask this question just because I'm curious to find out. As far as I understand, the Nyquist theorem says that the sampling frequency must be at least twice the bandwidth of the signal to be sampled....
2
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1answer
4k views

Alternative to lead-acid battery on power wheel toy

This might be a silly question, but here I go. My son’s power wheels car battery (12v 9.5Ah lead acid) is gone and, here in Venezuela, they are pretty difficult to find, not to mention the high prices....
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1answer
665 views

Charge LiPo 5S with 18.5V laptop power supply

Is it possible to charge 5000mah 5s lipo pack with cheap $10 HP laptop power supply without special LiPo charger? Just by connecting the leads. The charge rate would be less than 1C. Power supply is ...
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1answer
1k views

How can I drive this laptop screen?

How can I drive this screen? It's a 1920x1200 display from an old Dell Inspiron 6000 which is now dead, but the screen is great and I want to use it in a project. Is that a standard (either physical ...
-7
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1answer
178 views

Is It Safe To Turn On a Dropped Laptop [closed]

My mother threw my Macbook out the windows and it landed on a flower pot. It has stayed intact however I'm reluctant to turn it on at risk of the hard drive getting damaged. Is it safe to power it up,...
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1answer
9k views

Laptop battery not working after replacing cells [closed]

I have a Sony VGP-BPS21A battery that I use to power my laptop. It is really old, like 5-6 years now and its cells have lost more than 50% of their capacity. As a new OEM is very expensive, hard to ...
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1answer
1k views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
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2answers
4k views

Estimate minimum discharge voltage in a laptop battery

The objective is to determine the best 18650 cells to replace the ones in my laptop battery. To do that, I need to know the minimum voltage the battery controller accepts before ordering the OS to ...
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2answers
725 views

Replace 5-pin push button in my laptop [closed]

I have a 5 pin push button in my laptop, that doesn't work. I have to replace that button, but in my town I don't have any in stock and I can't wait for the delivery from China. How can I replace ...
-1
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1answer
1k views

What's the purpose of this bulky cylindrical part near the plug end of a laptop charger cord? [duplicate]

I want to fix my laptop charger cord, I used a multimeter to check the voltage and it gives me less than one volt. It feels very flexible near the plug, but I don't know if I can cut before or after ...
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3answers
687 views

Can I safely substitute a DC converter for the Macbook's AC adapter?

I want to go from this: to this: The converter would be this: http://smile.amazon.com/dp/B00HVCWGNE or something like it. Does this sound safe? The step up converter would be set to a specific ...
33
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2answers
58k views

How does a USB C port provide the power to charge laptops?

I've heard about laptops such as the new Chromebooks that are charged via a wall charger that connects to a USB-C port. I'm quite happy that this will supposedly standardize laptop chargers but I'm a ...
0
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1answer
136 views

Laptop shows battery is 4% charged, but it is charged to maximum [closed]

I got old acer computer and i noticed that when I plug in charger, it says it is charging, but after 5 hours it still was 4% only, so i decided to get out battery and check it with manualy using ...
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3answers
7k views

Hacking laptop power button: Turn on laptop when AC's back

I'm using one of my old laptops as a server. I'm running the laptop without battery in case of a need for a hard reset. When I need a hard reset, I want to be able make this happen with a toggle of AC ...
3
votes
2answers
239 views

How does a laptop maintain battery at full?

I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum. I am unsure whether the laptop would switch ...
22
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5answers
9k views

Can FPGA out perform a multi-core PC?

I don't understand how FPGA can be used to accelerate an algorithm. Currently I'm running a time consuming real time algorithm on a quadcore laptop so that four computations can be done in parallel. ...
0
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1answer
4k views

Turn Laptop Battery to a Power Bank

Is it possible to turn a laptop battery into a power bank? I have seen video tutorials and articles on how to turn AA Batteries into power banks, however, no one has created a power bank using a ...
-3
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1answer
3k views

Headphone has no sound if fully inserted in jack [closed]

When I connect my headphone to headphone jack in my laptop, I don't hear any sound. Unless I do not fully plug it in and instead just plug it in around 50%. Sometimes I hear sound but it is all ...
-1
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1answer
188 views

19.5V, 5.13A power supply to replace 19.5V, 7A power supply? [duplicate]

I have this laptop: http://www.newegg.com/Product/Product.aspx?Item=N82E16834233058 It came with a pretty large and heavy power supply, so I am trying to replace it with a smaller one. The reason why ...
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 ...

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