Questions tagged [motherboard]
The motherboard tag has no usage guidance.
181
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How does a PC switch turn on a PC?
Here is my current level of understanding: virtually every PC case has a switch near the top to power on the PC. When the PC is off, pressing the switch once will power it on and the PC will begin ...
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15 ohm resistance between 5V and ground is it short circuit?
My Macintosh 7100 has 15 Ω resistance between 5V and ground so power supply goes to shutdown. Unfortunately I can't find any schematics for those machines, so I have no idea how to trace the fault.
...
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Display Port 1.4 Hot Plug Detect (HPD) Behaviour on AMD 7040 Motherboard
For some reason I can't get my DP port working on the AMD 7040 motherboard that I have designed, where on the same board, I have also Mini-DP that has an identical electrical circuit (in schematic) ...
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(Tiny, very few, raindrops of) Water got into computer [closed]
my CPU was placed next to a window and due to rain a tiny amount of raindrops entered into it. This happened around 3 hours back.
Water on the top of the case was a tiny bit and inside I could only ...
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My computer force closes games while I’m playing them [closed]
I have done everything I can think of to solve this problem. My computer sat in my car for months while I was in boot camp and I found a spot on there that might be causing it but I don’t know enough ...
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What is it needed to repair the pressure pads of an electric piano keyboard? [closed]
I don’t know if this is the right place to ask, but this is important to me, so i hope you understand. I have an electric piano keyboard (Korg Kross I). It is supposed to detect automatically the ...
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how to determine what chip wire allows BIOS flashing?
how to determine what chip wire/leg allows BIOS flashing?
I want to modify my MOBO to deny BIOS flashing.
I only want it allowed when I really need to write on it.
So, I need to know:
if it is ...
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What is the least amount of time for visible corrosion build up on a motherboard
I am wondering how long it takes for visible corrosion to build up on a laptop's motherboard ?
I have bought a new sealed laptop from a reseller of a well-known manufacturer.
After very short time of ...
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Can I separate a LCD screen from the board?
I am using this 2x16 LCD
https://www.amazon.com/GeeekPi-Interface-Adapter-Backlight-Raspberry/dp/B086VVT4NH/
I am trying to make the LCD ultra slim to fit in my project. Can I dismantle 2x16 LCD and ...
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Role and capacitance of small capacitor near USB 3 socket of HP EliteBook x360 1030 G3 (mainboard model YOP)?
During rework for replacement of the USB 3 socket on an HP EliteBook x360 1030 G3, I lost the small orange circled capacitor. I looked everywhere and cannot find it.
The motherboard model is YOP (or ...
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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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What are these PCIe connectors that are slightly larger than SFF-8653 8i?
I have some computer motherboards that ware evidently a special-order for the ASRock Rack because the vendor does not have the model listed on their website, and when I contacted them they said they ...
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Trusted Platform Module (TPM) connection type
What connector is a discrete, pluggable Trusted Platform Module (TPM) supposed to use? I've seen LPC (Low Pin Count) mentioned, but I am not sure. Or do TPMs support multiple types of connectors?
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What is this Lenovo 4-pin fan header?
I have a Lenovo p620 machine and I'm trying to swap out the terribly loud fans with Noctua PWM fans. The problem is the 2 chassis fans are using a weird 4-pin connector where the ridges are on the far ...
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Why are there separated power circuits for CPU, GPU, and RAM on a motherboard?
Even though there is a power supply unit in a computer case, why are there separated power circuits for CPU, GPU, and RAM on the motherboard?
I mean, why can not the CPU, RAM and GPU just take their ...
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Power switch touch button
I am building a touch industrial panel PC with an embedded motherboard, an LCD panel and a touch sensor.
I need a touch button to switch power on/off.
I have three questions:
How can I switch the ...
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Motherboard powered by a charger converting AC to DC while using internal switching power supplies which uses AC as input?
I'm confused: from what I understand, switching power supplies (like this one) output DC from AC input.
But if it's true, why do (most?) motherboards use several internal switching powers supplies (e....
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What is the actual trigger of motherboard debug LEDs?
I am aware that when one remains lit, it is indicative of the part of my system that can't be initialized; it's helped me with several builds. However, I can't help but notice that even in a perfectly ...
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Get on/off state of a PC (with 12V or 5V)
On a classical ATX mother board, how to get the ON/OFF "state" of the PC with a voltage?
0V if the PC is off
5V if the PC is on
(or 12V or any other voltage)
I thought about just taking ...
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Why do inductors in motherboard VRMs have high-voltage build-up without diodes?
I just watched Bullzoid/Actually Hardcore Overclocking's video on how VRMs actually work, and I have a question.
First, in my understanding, the diodes in the VRMs are included to stop the inductor ...
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How are the transistors in motherboard controlled and timed?
I just watched Bullzoid/Actually Hardcore Overclocking's video on how VRMs actually work, and I have a couple questions.
In the video, the Bullzoid mentions how the transistors are switched on and off....
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Identify this chip is on a Dell OptiPlex 745 motherboard
I have a Dell OptiPlex 745 motherboard. I am unable to identify the below chip.
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Why do most computer components get power through the motherboard? [closed]
I understand that most of the components of the computer needs power to operate, and they get power from the motherboard.
Why must the computer components indirectly get power from the motherboard but ...
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Measuring if LED power is active
Apologies for ignorance. I have a computer motherboard with a broken connector to its LED power indicator. Everything else works fine but I would like to get the LED connection up and running. Where ...
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x86 Motherboard Bring Up - Intel Tiger Lake UP3 CPU
For those who has experience with Intel x86 motherboard design and bring up.
I'm in the middle of motherboard bring-up that has Intel Tiger Lake UP3 CPU.
Seems like I had a good run so far at power-up ...
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What are these white/grey stains on the back of a motherboard?
I've recently bought a used motherboard and while cleaning it, I noticed these white stains on the back side of the PCB:
I've managed to perfectly clean the front side with pure isopropyl alcohol and ...
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Can I substitute a capacitor with the same rated capacity and voltage but a lower inductance and higher rated ripple current for a mobo repair?
I have an early to mid 2000's motherboard that I am trying to restore. It looks to be mostly in good condition but a blown radial electrolytic capacitor might be causing trouble. From the placement of ...
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What is the pictured component?
Does anyone know which SMD is shown in the picture below? It's labelled with 20J on its body and PU5004 on the PCB. Online research didn't bring me anywhere. I tried to look up motherboard schematics ...
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CMOS coin battery drained out in 5min even without the BIOS IC
I have a high-end motherboard (Asus WS Z390 Pro) out of warranty. My bios looses its settings everytime cut-off the power. I found out something is draining the battery way too fast.
I decided to ...
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Laptop motherboard not working, quiet clicking noise
Intro how it happened:
I had cleaned my laptop from dust and reapplied the thermal paste. After this i have reassembled the device than it did not turned on. Then i took it apart connected the fan and ...
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Knocked off a diode during a display motherboard repair, not sure what it does or what it is or does. Please help
I have an LG ultrafine 5K 27MD5KA-B. The USB-C port became loose inside so I went to repair it. Long story short, that repair requires hot air and I accidentally blew a diode off the board. See images....
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Is forcing power through a faulting board a good diagnostic tool?
I was researching how to diagnose what SMD was shorting on a laptops motherboard when I found an unusual diagnostic test. The video I came across
showed a tech using a variable power supply to force a ...
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Identify 8-pin surface mount component on motherboard
I'm trying to identify a surface mount component on an Asus ROG Maximus X Hero motherboard that I'm trying to repair for a friend. The board does not boot up after a power supply failed. I have found ...
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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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Why did a spark occur between my HDMI cable and metal lamp base?
Edit:
Update 1/2/22 @ 2:27 UTC: outlet tester shows that all outlets and power strip outlets being used were normal.
Update 1/2/22 @ 21:07 UTC: performed various continuity tests which suggest to me ...
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What kind of sata connector is this?
I have an HP motherboard that has some SATA connectors that I'm not familiar with. What kind of connector is it?
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How important is a PCIE_PEG_TXN pin on a motherboard?
I managed to break the PCIE_PEG_TXN 2 pin on my motherboard according to this pin layout: https://sector.biz.ua/docs/lga-775-1150-1151-1156-1155-1366-2011-pinouts/s1200_1.png I am curious if it is ...
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Old computer socket disconnection, cleaning, and repair [closed]
I have very old computers; from time to time the RAM disconnects. I remove the DIMMs, clean the sockets using Isopropyl alcohol many times until it works again.
It will be fine for few weeks, but I ...
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Problem with identifying a component [closed]
What is this little part called?
It seems to be burnt, does this require the replacement of the whole motherboard?
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M2 (key B) connector with supported USB interface
At many motherboards there is M2 (key B) connector. This connector support several interfaces: PCIe ×2, SATA, USB 2.0 and 3.0, audio, UIM, HSIC, SSIC, I2C and SMBus.
But as I understood, all of these ...
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What is the pictured component on a computer motherboard?
Could someone please help me identify what this component is? This is from an HP laptop motherboard (FPP55 LA-G07JP)
marking on the component are:
...
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FTDI cable (TTL-232R-3V3) mixed up wires [closed]
At the beginning of the measuring task, I mixed up wires connecting my FTDI USB to UART cable (TTL-232R-3V3) with serial connector header pins (TX/RX/VCC/Gnd) on device (data modem). I didn't ...
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PC motherboard 2-pin bi-color LED driving
I'd like to use a single bi-color 2-pin LED (red/green in my case) to display both Power and HDD activity of my PC. The case has no provision for an HDD light so I'd be replacing the single color ...
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Can a static shock to a motherboard damage a hard drive that is connected? [closed]
Hypothetically, could the shock spread through the board and follow the wires and damage a hard drive?
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ESD damage to old system [closed]
I was doing a capacitor check on an old xbox motherboard. I always knew that you could damage a motherboard by touch but at the time either my mindset was off or overconfident in its supposed rarity.
...
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Can a pin to DDR4 be as thin as household tinfoil? (0.016 mm)
Edit: I think using the term "bus" might be wrong here. A "bus" needs to be large enough to facilitate an entire DDR4 stick's bandwidth to the Northbridge. The connection to each ...
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How to take this board off the undercover without breaking it?
I have this ECU on the below picture, I tried to pry it apart from the undercover with a screwdriver, but I dont want to put too much pressure so I don't break it. Any idea how to separate it? Also, ...
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MOD PCB with pads on bottom only - Danger of short circuit while reflowing?
I want to design a MOD PCB (daughter board,) to transform from QNF package to QFP package to use it on a existing/mother-board (just a reminder of the packages):
Picture taken from here.
My MOD PCB ...
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Does the JTAG port have enough bandwidth to monitor the state changes of all cores on an x86 machine, or even one at a time?
Based on my related question on Info Sec SE I want to know if I could track all changes to register state (and perhaps memory too) on multiple cores of an x86-64 CPU.
Some of my research so far ...
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Motherboard of my printer that burns out
I'm asking for your help because I have some problems with electronics!
I am designing a 3D printer with LCD technology. For this printer I use a NanoDLP motherboard and a 24V 250W Tiger Power supply (...
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