All Questions
Tagged with power-supply voltage
58
questions
9
votes
2
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
76
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
632
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
578
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
876
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
156
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
708
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