All Questions
Tagged with power-supply voltage
58
questions
9
votes
3
answers
3k
views
Is it safe to replace a 11.25V laptop battery with 11.1V or 10.8V?
I need a replacement battery for an older laptop that originally came with an 11.25V Li-ion battery (presumably 3 cells at 3.75V each).
The batteries I found online mostly have a nominal voltage of 11....
- 161
0
votes
1
answer
75
views
Can a loosely connected PSU damage a laptop?
is it a bad thing that the cable connects to the power adapter block in a laptop power supply comes loose and is left alone while the laptop is under use (as shown in the picture)? I am worried it ...
- 21
0
votes
2
answers
1k
views
What could be causing this erratic power/voltage behavior with USB ports on a desktop PC?
In short, I am having issues with what looks like to be power management of USB devices by my computer. I have had the following symptoms pretty much since I bought it in November 2021.
When I connect ...
- 123
1
vote
0
answers
125
views
PC sometimes turns on and sometimes not with different outlets
When the Pc is plugged to an outlet and I press the on button, it will sometimes turn on. when the pc is on and goes into sleep mode, it won’t turn back on again. I tried replugging the cord to same ...
- 11
0
votes
1
answer
630
views
The purpose of PSU & motherboard -12V line
Typically PSUs have -12V line rated about 0.2 - 0.5A. But for what is it used?
Is it used for example with one of the +12V lines to get total 24V?
What component or so needs that -12V or possibly 24V?
- 105
12
votes
3
answers
30k
views
How can I detect the USB-C power delivery voltage?
I have an HP laptop which I charge with a USB-C charger through the USB-C port. I have no idea which power delivery (PD) version it has and if it's PD-compliant at all. However, as the charging works, ...
- 1,345
0
votes
1
answer
574
views
Server power requirements
The computers that I’ve been exposed to only require a typical American 120 volt outlet to the PSU. From what I understand, depending on the homes electrical layout you’re limited to about 15 amps, ...
0
votes
0
answers
94
views
low voltage POST only means battery problems?
No doubt the watch battery on the motherboard long since lost its juice.
However, I'm not quite sure what error I saw on boot, I think it was before POST and I think it mentioned "low voltage&...
- 1,650
1
vote
1
answer
869
views
Can I use a power supply with different input/output voltage for router?
I bought a Verizon g3100 router; it did not come with its external power supply. The needed cord has an input of 105-125v ~ 60Hz 1.5a and output 12v 3.5a.
I can't find exact cord anywhere but I ...
0
votes
1
answer
155
views
How to replace my power supply safely?
If something is powered from a 9 V and 1 A supply, you can replace it with a 9 V and 1 or more amp supply. How would one calculate if it is safe to replace it with a less voltage and less amperage ...
- 101
0
votes
0
answers
1k
views
12v line is showing up to 14v in BIOS (DMM reading are fine)
Purely by chance, upon rebooting, in the BIOS, I saw that 12v line was showing 13.9v, although I used the computer normally all day long.
After resetting all settings in the BIOS and reboot, nothing ...
0
votes
2
answers
5k
views
can i power a device with more output amperage than the device needs? [closed]
I just brought a speaker that runs on 12v power supply. So i want use it on my car.
Can i power a speaker with a car battery 12v directly?
Speaker input: 12V, 1.25A
Car battery output: 12V
3
votes
0
answers
216
views
PSU voltage and microfreezes
A week ago, my PC started exhibiting a problem. When scrolling in a web browser or trying to game, microfreezes happen randomly.
The PSU is five years old, and some of the voltages look out-of-spec, ...
0
votes
0
answers
43
views
What do I need (powerwise) to plug my French gamer PC in Canada
I read on metastack that superuser is the place to ask hardware related stuff, hope it fits.
I recently move from France to Canada and I'm going to get my gamer PC shipped soon.
What will I need to ...
- 101
1
vote
2
answers
11k
views
Okay to supply more amps? Use a 14V 4A 56W power adapter on a 14V 3.21A (45W) monitor?
I have a Samsung 4K monitor, LU28E510DS/ZA (Costco exclusive variant), with a back panel describing DC14V 3.21A.
I cannot find an exact replacement power supply. I found one that is close at 14V 3A ...
- 936
7
votes
1
answer
29k
views
USB-C Chargers: Is it safe to charge a phone with a laptop's power supply?
I have an HP Chromebook and a Nexus 6P smartphone, and both of them use USB-C connections for charging. When I plug the Chromebook into the Nexus's charging cable, it works fine and I just get a ...
- 417
0
votes
0
answers
280
views
Console powers off and powers on in quick succession. Insufficient current? Voltage drop?
I have a question about a specific setup I have.
I have a Nintendo Classic Mini console, this console:
requires 5V/1A through its USB 2.0 micro-B female connector to power the console
outputs ...
0
votes
3
answers
1k
views
Safe to use a 19V 2.15A DC adapter (a laptop charger) for an accessory that uses a 25V 0.75A DC adapter?
I picked up a USB steering wheel at a thrift store and it requires a power supply to 'nudge' the wheel back into place (if you let go of it, for example). It requires 25 Volts, 0.75A, yet the closest ...
- 103
0
votes
1
answer
331
views
checking desktop power supply voltage range.
I have a few computers. I know some of the power supply is 110-220 and some are only 220. I need to figure out which ones are which. How do I do that? I can't seem to find it in the control panel. Is ...
- 31
0
votes
1
answer
3k
views
3.3v rail randomly going low after a period of use
I am having a recent problem with my PC.
After a "random" amount of 100% stable running time (anything between 1 - 12 hours), the 3.3v rail will suddenly start dropping step-by-step from 3.36v to ...
- 111
2
votes
1
answer
4k
views
Motherboard is showing 24v instead of 12v
I have put together a new PC build and when I turn on the machine it's showing me the following error/warning:
"Asus anti-surge was triggered to protect system from unstable power supply"
Besides ...
- 123
1
vote
1
answer
386
views
Laptop Power Supply Modification
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 ...
- 1,613
0
votes
1
answer
4k
views
Need some explanation about PC and AVR (Automatic Voltage Regulator) [closed]
I have an AVR and my PC plugged into. I Live in Europe and the voltage in the mains is +-240V.
The AVR has a LCD display showing the current input (mains) is 237 and the output voltage 210-217V. My ...
- 3
9
votes
2
answers
5k
views
Under what conditions will a group-regulated PSU damage a modern computer?
These days, group-regulated power supply design is considered obsolete and is ideally avoided—primarily due to the poor regulation under crossload. For example, Shilka pulls no punches here, and while ...
- 3,024
0
votes
0
answers
1k
views
Power adaptor seems to be outputting too high a voltage
I'm in a country with an unreliable national electricity supply, where staff in the compound in which I live run a generator at certain hours if there's no national power.
Recently, the generator ...
- 5,396
7
votes
4
answers
10k
views
Can computer power supplies use North American 240V (hot-hot-ground)?
Simple question: Most computer power supplies are auto-sensing between 110V/120V and 220V/240V. This begs the question, can they use 240V in North America i.e. connected to both hots (red and black)?
- 198
1
vote
0
answers
2k
views
5v rails is getting 5.7v even with new PSU
I need help. I'm on my mobile typing this so i'll be word efficient. (English is not my native language and I only have a basic understanding of pc's)
What's the problem?
After the weekend I tried ...
- 11
-2
votes
1
answer
707
views
Will an external battery power bank power an mini-ITX board (~200W)?
I was planning to build a laptop from scratch, and I've found some good DC-DC converters that allow you to use an external power source to power a standard desktop board (in this case a mini-ITX). The ...
- 1
1
vote
2
answers
7k
views
Does a PCIe 8pin power cable use just one 12V rail.
Looking at a diagram below of a PCIe power supply connector it shows it has 3 12V pins. When it's plugged into the PSU how many 12V rails does it use?
I assume it is just one, but how does that work? ...
- 870
2
votes
1
answer
632
views
wireless router power adapter replacement 0.5a vs 0.6a
i have a wireless router with no power adapter, it needs a 9 volts 0.6 amperes adapter but i only have 9 volts 0.5 amperes power adapter.
Will 9 volts 0.5 amperes power adapter damage my wireless ...
- 23
2
votes
2
answers
18k
views
Can low voltage damage laptop or it's battery?
Sometimes I get very low voltage in my house. I am worried if I connect my laptop charger to the socket, will it damage the charger, battery or the laptop itself?
- 139
-2
votes
1
answer
96
views
Power Adaptor Compatibility [duplicate]
my Sony Vaio Power Adaptor broke today and i wondering if i could replace the broken one with the Adaptor from my older Vaio, here are the specs :
Broken Adaptor : VGP-AC19V54
Old Adaptor : VGP-...
0
votes
0
answers
87
views
Computer slow after plugged into wrong voltage
So I set up a desktop computer running ubuntu in a classroom that was running through an AVR at 220 volts. I got a report that it wasn't working, so I came to look at it, and sure enough, fans and ...
- 1,697
0
votes
1
answer
2k
views
connecting two 3.7v battery's to tablet, in parallel for extend the working capa
my tablet have 2500mah battery. it works for four hour. but I want to extend the source power.
so I want to connect another same voltage battery to tablet. battery was 1500mah.
can i make connection ...
Vighnesh
1
vote
0
answers
204
views
Should you worry about high voltage and wattage on a non-overclocked computer?
I've been wondering if I should be worried at all about high wattage or voltage on a non-overclocked computer. I say non-overclocked because when I Google search this question or something similar it ...
- 39
-1
votes
3
answers
4k
views
What do OUTPUT charts of PC Power Supplies mean?
I'm looking at various power supplies and they all come with different output cables.
They also have different OUTPUT charts, for example:
What I'm wondering:
What are these output columns are ...
- 325
0
votes
1
answer
745
views
How can a power supply rated 7A be strong enough for two devices rated 5A? [closed]
I am not understanding something fundamental to amperage:
Consider this adapter which outputs 12V 7A. It claims that several (eight, in this case) devices running at 12V 5A can draw enough power from ...
- 1,144
2
votes
2
answers
4k
views
PSU blue wire reads strange voltage
I was testing my PSU with the paperclip method and checking the voltage of every wire just to be sure it is 100% functioning.
What surprised me was that every wire was working just fine but one, the ...
- 35
2
votes
1
answer
3k
views
Is PSU voltage ripple something to worry about?
I'm currently putting together my first computer and I've had my eye on a Fractal Design Newton R3. From all of the reviews I've read this PSU comes out shining with the exception of voltage ripple on ...
- 222
1
vote
2
answers
2k
views
Computer cables explained [closed]
I've noticed lately that places to learn about both power supply cables and also peripherals and fans aren't that easy to find.
There's very little information available that gives detailed ...
- 222
1
vote
3
answers
2k
views
would I save power using a lower voltage power adapter? (on a modem)
from various experiences modems, access points, and other devices will often run fine even with power adapters of lower voltages (compared to their original power adapter).
I am wondering if using a ...
user253974
0
votes
1
answer
2k
views
Power Supply case measures 75V?
My friend showed me his dead computer. When I powered up, the green LED on the motherboard didn't even come on. He had bought a new $40 500W power supply and he wanted me to install it. I did, and ...
- 11
0
votes
2
answers
885
views
Cable from laptop brick to wall [duplicate]
I've seen plenty of questions asked about the power output of laptop bricks to the laptop - however my question is does the plug and cable that runs from the laptop brick to the wall need to match up?
...
- 1
1
vote
2
answers
8k
views
Power supply bad with good voltage?
I am trying to drive out the reason I am having some hard drive "hard resetting link" error problems on a Linux Debian box.
I am trying to eliminate the power supply as a problem in trouble shooting, ...
- 1,934
2
votes
1
answer
12k
views
Insufficient power from an adapter
Would not having enough power (or voltage or amperage) from an adapter make a laptop no longer charge/boot up (if the battery is out of power)? What about causing shorts? And would using a different ...
- 133
0
votes
1
answer
75
views
Manually starting a PSU lowers the output Voltage
I have a PSU. When I start it using a motherboard, I get a little over 5 and 12 volts on the respective lines. But when I manually start it (by connecting PS_ON to ground), I get only 4.2 Volts on the ...
- 116
2
votes
2
answers
2k
views
Weird voltage issues - intermittent low 5V line
My computer has developed a strange ailment: when I turn it on, the 5V power line from the PSU is very low, hovering at around 4.2V. This is intermittent however, sometimes it jumps back up to 4.98V.
...
- 145
1
vote
1
answer
3k
views
What are the costs and benefits of using 12V-only motherboards? [closed]
According to my research, it sounds as though power efficiency concerns in recent years have driven some hardware manufacturers to create different power supplies and motherboards which are "12V-only"....
- 423
1
vote
2
answers
883
views
HDD is very slow after voltage drop
The HDD is Seagate Barracuda 7200.7 160 Gbytes
Model ST3160023A. Of course it is not SATA.
I once connected it to the USB via special adapter IDE-to-USB, and a separate power unit. The voltage drop ...
- 143
9
votes
4
answers
6k
views
Can I have too high a PSU power rating?
I have just ordered a 650 W PSU for my computer which previously had a 300 W, in order to install a more powerful graphics card. However, I didn't check whether anything would blow up ...
- 315