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Questions tagged [motherboard]

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Locating an NTC on a AFCI receptacle [closed]

This is the mother board of an ARC fault receptacle. Which component is the NTC thermistor on the board.
Michael 's user avatar
7 votes
2 answers
956 views

PCIe implementation

I was reading about the PCIe stadard, it was mentioned about PCIe PHY, Switched, RootComplex and Bridges that make the PCIe fabric. I'm trying to connect the dots between the physical hardware and the ...
Hitab's user avatar
  • 95
1 vote
2 answers
81 views

help to identify the component

I don't understand what component it is (0k=g9w), and it needs to be replaced. I've done various searches, but I can't figure it out. This is a motherboard from an Asus computer.
Jhon M.'s user avatar
  • 11
1 vote
1 answer
64 views

Is it safe to remove this LED from that motherboard? [closed]

So, I've bought this SATA case from internet but it has a really bright light on it and annoys me. I don't haver any kind of tool to manage any electronic component, and neither have electrical tape ...
star1837's user avatar
0 votes
1 answer
98 views

With what can I replace a MLCC capacitor to ground of 6.3V and 4.7uf

I have a mobo and the cap highlighted above in the picture C4 (6,3V 4,7uF) has broken off, I want to know what can I replace it with if I dont have specifically the same voltage and capacitance but ...
theo1996's user avatar
0 votes
0 answers
96 views

How is the address line A20 enabled in modern hardware?

In the olden times, the memory address line 20 (A20) of the 80286 and others was automatically masked by the IBM AT motherboard. It could be enabled using the keyboard controller. Then the 80486 ...
Schilive's user avatar
  • 135
2 votes
1 answer
218 views

Ground terminals on the laptop PCB; laptop PCB troubleshooting/repair

I'm not an electronic expert at all, but I'm keen on various electronics and stuff, and I like to watch videos where the different laptops are fixed. And in nearly every repair there is a multimeter ...
Gog's user avatar
  • 33
1 vote
3 answers
944 views

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 ...
David D.'s user avatar
  • 175
0 votes
1 answer
410 views

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. ...
zabykrinich's user avatar
0 votes
0 answers
247 views

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) ...
Firas Abd El Gani's user avatar
-1 votes
2 answers
83 views

(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 ...
0fnt's user avatar
  • 107
-2 votes
1 answer
72 views

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 ...
user14575138's user avatar
0 votes
1 answer
47 views

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 ...
Simón Flavio Ibañez's user avatar
0 votes
0 answers
62 views

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 ...
VeganEye's user avatar
0 votes
2 answers
616 views

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 ...
sogrady's user avatar
0 votes
1 answer
163 views

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 ...
Mohamed Essam's user avatar
0 votes
1 answer
50 views

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 ...
OuzoPower's user avatar
  • 181
1 vote
0 answers
168 views

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 ...
Daro's user avatar
  • 11
1 vote
0 answers
125 views

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 ...
MikeSchinkel's user avatar
2 votes
2 answers
128 views

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?
Melab's user avatar
  • 443
9 votes
3 answers
2k views

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 ...
Chris Smith's user avatar
15 votes
6 answers
4k views

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 ...
Ali's user avatar
  • 167
0 votes
0 answers
49 views

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 ...
Lotfi Bensassi's user avatar
0 votes
2 answers
201 views

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....
JinSnow's user avatar
  • 185
-1 votes
1 answer
220 views

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 ...
Michael Macha's user avatar
0 votes
2 answers
243 views

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 ...
Basj's user avatar
  • 1,936
2 votes
3 answers
345 views

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 ...
itisyeetimetoday's user avatar
0 votes
2 answers
102 views

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....
itisyeetimetoday's user avatar
0 votes
1 answer
203 views

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.
Ronnie's user avatar
  • 21
-3 votes
1 answer
177 views

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 ...
CPP_is_no_STANDARD's user avatar
0 votes
0 answers
44 views

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 ...
John Anthony's user avatar
7 votes
0 answers
405 views

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 ...
Firas Abd El Gani's user avatar
0 votes
2 answers
2k views

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 ...
Prototype700's user avatar
1 vote
4 answers
2k views

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 ...
Zeno of Elea's user avatar
0 votes
0 answers
253 views

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 ...
andrebienemann's user avatar
2 votes
1 answer
1k views

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 ...
None's user avatar
  • 372
26 votes
1 answer
2k views

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 ...
iconradez's user avatar
  • 455
0 votes
2 answers
453 views

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....
KyleG's user avatar
  • 11
5 votes
5 answers
2k views

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 ...
fftk4323's user avatar
1 vote
0 answers
178 views

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 ...
Aaron Adamski's user avatar
1 vote
2 answers
229 views

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 ...
Criss M.'s user avatar
8 votes
3 answers
2k views

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 ...
dfncrbl's user avatar
  • 89
0 votes
4 answers
518 views

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?
blfinche's user avatar
2 votes
2 answers
792 views

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 ...
inf3rno's user avatar
  • 223
0 votes
1 answer
75 views

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 ...
Hamed's user avatar
  • 19
0 votes
1 answer
57 views

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?
Iridium's user avatar
0 votes
0 answers
264 views

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 ...
j e's user avatar
  • 11
0 votes
2 answers
3k views

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: ...
user13267's user avatar
  • 621
1 vote
1 answer
187 views

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 ...
minto's user avatar
  • 359
0 votes
1 answer
219 views

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 ...
Paul's user avatar
  • 1