Questions tagged [motherboard]

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17
votes
6answers
3k views

How do I desolder these specific points?

I'm currently attempting to replace some bloated caps on an old PC motherboard but am currently having problems with some specific points. Here's a pic of the motherboard: . The area outlined in ...
10
votes
4answers
14k views

Is it safe to use a higher value capacitor?

I am trying to replace a bad 820 µF, 6.3 V capacitor on my PC's motherboard. Right now I don't have a 820 µF capacitor in my home and also don't have enough time to buy a new capacitor. I have two 470 ...
8
votes
4answers
4k views

Why motherboards have two pins for LEDs, led+ and led-

Very often you can find that there are two signal pins (+) and (-) for the LED in the motherboard. 1) Why not use one signal (+), and minus replace the ground? 2) What signal can be considered a ...
8
votes
1answer
6k views

7 port powered USB hub backfeeding to my PC

I just bought two 7 port usb hubs: LogiLink UA0124. Just to run into a strange situation. I did some servicing to my PC today and disconnected the main power cord from the PSU. Only to find out that ...
6
votes
2answers
2k views

mATX motherboard JFP1 header: Does not require pull-up or pull-down resistors, right?

As per some of the mATX motherboard specifications, the JFP1 (Front-Panel connector #1 jumper), the purpose of the various pins is as per this graphic: As per the description of the pins, I get the ...
6
votes
1answer
846 views

Why are contacts missing on some of these M.2 modules?

I want to replace a preinstalled Qualcomm Atheros WiFi/Bluetooth M.2 2230 card on my motherboard (ASUS Maximus VIII Impact) with another that has better driver support. This is what the card I want to ...
6
votes
1answer
6k views

LED specs for atx power on status

Most ATX motherboards have those same pins for 'interfacing' with the computer case... depending on the manufacturer they vary on position (hence loose wires at the case end) but never function. So i ...
5
votes
3answers
21k views

Questions about reflowing solder on a motherboard

One of my laptop's DIMMs is dead and working with less than my usual 8GB of RAM is brutal. Multiple sources suggest reflowing the board. I quite frequently tinker with/hack my electronics, but I've ...
5
votes
5answers
10k views

How can I adapt a 3-pin PC fan connector to a 4-pin connector?

My computer's motherboard uses all four pin fan connectors with no support for speed controlling the older three pin fan connector. The problem is, all the PC fans that I have use a three pin ...
4
votes
2answers
3k views

Accidentally knocked a capacitor off a laptop motherboard seemingly related to USB

I accidentally knocked off a capacitor from my laptop motherboard (Lenovo Thinkpad S540, VIUS6 LA-A171P board). According to the circuit diagram, this capacitor (C2434) was something to do with the ...
4
votes
3answers
12k views

Can a 6.3v capacitor be replaced with a 16v capacitor? [closed]

I'm repairing my old 478 socket computer motherboard and two 6.3v 2200uF capacitors near the CPU are bust. The computer still powers on, but it doesn't pass the BIOS screen without the ps/2 mouse ...
4
votes
4answers
165 views

What could be generating this waveform in an EMC Compliance test?

We are having trouble with a CISPR-11 (EN55011) Radiated Emissions Class B compliance test in one of our solutions. The troubling part of it is basically an industrial motherboard (with a commercial ...
4
votes
1answer
465 views

Strange footprint labeled PJ## on laptop's motherboard

Today I came across a picture of a laptop motherboar (below). I noticed three strange looking small footprints, labelled PJ12, PJ36 and PJ37. The J may stand for jumper, and on the top left corner ...
4
votes
1answer
4k views

USB 3.0 Bandwidth Per Individual Port

Folks, Let's say I have a USB 3.0 card with four USB 3.0 ports on it. I just connected the card to my mother board. When we say 640MB/s of bandwidth for USB 3.0, is that bandwidth per port (or 640*4 ...
4
votes
1answer
4k views

How to Hardware Write Protect Flash SPI, Setting WP# pin signal low stage [Asus P5Q Pro + MX25L8005 SPI]

As a pen testing & security experiment and feature I want to enable write protect on my SPI Flash MX25L8005 module on my motherboard to protect the SMM modules, AML, ACPI and other areas of the ...
3
votes
4answers
2k views

Type of Header for Motherboard PWR Switch

I am trying to make my own 2-position connector cable to connect a Rasberry to the PWR_SW's PWR and ...
3
votes
1answer
2k views

Can Computer Motherboards Work Fine Even With A Damaged SMD Capacitor/Resistor?

I'm asking this because when I was replacing my laptop battery, I accidentally hit and broke/disconected one SMD capacitor off the board, then I turned my laptop on, it made some weird electrical ...
3
votes
2answers
486 views

Transparent epoxy covering component on logic board

While performing CPR on a MacBook Pro exposed to water, I accidentally removed a piece of glue/epoxy from the logic board. It is a strip of glue covering two components with blank metal surfaces. It ...
3
votes
1answer
4k views

PCB Reflow in oven, will solder melt before VRM's, caps etc get damaged?

From Wikipedia: Alloys commonly used for electrical soldering are 60/40 Sn-Pb, which melts at 188 °C (370 °F), and 63/37 Sn-Pb used principally in electrical/electronic work. 63/37 is a eutectic ...
3
votes
2answers
2k views

How do devices with different external clock communicate between each other on a motherboard?

I don't have any pratical knowledge about eletronic circuit. Actually I am a high level software programer and I've just begin to learning about computer hardware and eletronics. Basically, I ...
3
votes
2answers
130 views

How can I create one PCB that I can plug-in to two different places in a mother PCB?

I believe there are many answers to this question, but I would like to have one that works best in KiCad allowing me to run the rule check for all the involved schematics. What have I tried: On top of ...
3
votes
2answers
95 views

How can I discharge static electricity from my body?

I am planning to install a PCI Express Wifi-adapter in my PC. In order to do this, I would need to open my PC. I'm worried that if there is static electricity in my hands it could fry the motherboard. ...
3
votes
2answers
6k views

Connecting 21" screen to LVDS connector on motherboard

I'm working in an "All-in-One pc" project. For that, I have an old Dell laptop (which only works with DC adapter) and a 21" LG monitor. My question is: How can I connect the LCD panel directly on the ...
3
votes
0answers
201 views

Can a PC motherboard be used as an uber microcontroller?

I'm aware of the differences between a common microcontroller and a full blown motherboard from a computer server. But consider what happens when the PC memory testing tool memtest86 is run:- Here ...
2
votes
3answers
3k views

What are these gray boxy components with R50 written on them? (Photo attached)

My motherboard came gradually to a complete death and I'm trying to figure out if one can repair it by fixing some capacitors like in the old days. I went through all the arrays of caps as well as ...
2
votes
2answers
763 views

Can i replace 3 (parallel) capacitors 16v 1800uf with 16v 2200uf?

The motherboard model is G31T-M REV:1.0 . The circuit is for the 4-pin 12v power rail coming from the power supply. I'm replacing these because they are very bloated, It's quite a miracle that the ...
2
votes
1answer
188 views

Help identifying a possible connector for these unterminated contacts on my HP Stream 14 motherbard

I'm trying to identify the appropriate connector for this bundle of unterminated contacts, from my HP Stream 14 motherboard. I'm talking about the red circled part of the motherboard: Here's a close ...
2
votes
1answer
3k views

pci express bifurcation - clock fanout buffer needed to split reference clock?

I am designing for a motherboard with a single PCIe x16 slot which can be bifurcated into 2 logical x8 slots with jumper settings. I am designing a board to handle the physical splitting of the port. ...
2
votes
2answers
3k views

Does moisture affect electronics?

So the situation is the following: I'm making half a dozen of my own electrical circuits which I would store in a long wooden box along with my micro ATX motherboard and the rest of my pc. The big ...
2
votes
1answer
72 views

Motherboard power-up issue [closed]

I am not entirely sure this is the place for my question but it is the closes i found. I am not an electrical/electronics engineer and this is my first attempt to what i am trying to do so please be ...
2
votes
3answers
3k views

Soaking phone motherboard in isopropyl to fix potential corrosion

Is it advisable/safe to soak my phone motherboard in an isopropyl alcohol bath? I dismantled it after water damage occurred and it now powers on fine but my cell signal isn't consistent. I was ...
2
votes
2answers
5k views

DIY : Powering a single LED with a motherboard's internal connectors

I'd like to power a bright LED (1W or 3W) connecting it onto a power source of my computer, directly on the motherboard. I think about using either a fan connector or directly the ATX Power supply. ...
2
votes
2answers
218 views

External CPU design

Apologies if this is a dumb question. I don't have any training in electrical engineering, so I can't gauge for myself how ridiculous this sounds. Would it be possible to modify a commercial CPU so ...
2
votes
2answers
459 views

What is this black tape on my laptop's keyboard?

I am trying to replace the keyboard on my 2019 Samsung Notebook 9 Pro. I had to pull off a layer of black tape on the old one to get it out. The tape was glued to the bottom of the keyboard, right ...
2
votes
1answer
834 views

How can I repair a ceramic capacitor? [closed]

This is an all-in-one Dell Inspiron One 2305. I received it for free because it was "having issues with the RAM." However, the power light was a solid amber when plugged in, and I was unable to ...
2
votes
1answer
326 views

Computer won't post / Beep unless Unplugged for a few hours [closed]

I'm experiencing this issue for almost a year now. It is slowly getting worse. My motherboard is Gigabyte GA-Z77X-D3H and my PSU is Corsair CX600. The source of the problem most likely has to do with ...
2
votes
1answer
308 views

Increase USB 2.0 power by adding buck converter to motherboard?

I'm thinking about adding more power to my laptops USB 2.0 ports, by hooking it up to a buck converter witch takes its input directly from the power connector of my laptop. The voltage and current ...
2
votes
0answers
68 views

Can I repair this motherboard damage? [closed]

I accidentally knocked a SMD electrolytic capacitor off the motherboard of an ASUS laptop I was stripping down to clean. It looks like the copper pad came off with one of the legs. So My questions are:...
2
votes
0answers
1k views

Conductive or insulated motherboard-standoffs?

AFAIK it's common practice to mount an ATX motherboard to conductive brass standoffs inside the case. There are even metal traces around the screw holes to provide contact between the screws and the ...
1
vote
2answers
1k views

Shared support chips and tooling between 16 and 32-bit computers

Can a production line for a 16-bit computer save significantly on unit cost by sharing support chips and tooling with another 16-bit computer, to a greater extent than if it went 32-bit? To be ...
1
vote
3answers
791 views

Signal and voltage

What is the difference between voltage and signal? In power sequence of motherboards, there are signals and supplies. Supplies are voltages but how is a signal generated?? Is signal related to both ...
1
vote
2answers
393 views

How to identify a PCB connector type?

Is it possible for someone to identify these backplane (motherboard) connectors, the ones in brown color? The daughter cards which plug-into these connectors are 3U size cards. This is an outdated ...
1
vote
2answers
466 views

How do we name the "spring-mounted spikes" component on MacBook Pro motherboards?

How to we name these components that we see on the motherboards of the MacBook Pro (either silvered or gold) when the bottom cover lid is removed, and that seem mounted on springs? Ancillary, does ...
1
vote
2answers
858 views

I want to attach a heat sink to the inductors on my motherboard, which glue could I use? [closed]

If I wanted to attach a heat sink to the inductors on my motherboard, which glue could I use? I have a Gigabyte A320M-S2H, this motherboard has heating problem when used with the AMD ZRyzen 7 2700X ...
1
vote
2answers
3k views

Fried motherboard resistors, what to do? [closed]

A motherboard failed under load recently, and here is the worry: I am waiting for a new mainboard. What must i do about it? is it a very easy repair? I am mostly confused about identifying the ...
1
vote
1answer
579 views

Can an FPGA connected to a CPU via PCIE access peripheral devices?

Is it possible for an FPGA connected via PCIE to a CPU, to directly access peripherals (USB Ports, data, Ethernet, etc) connected to the same CPU via a chipset? I had an Intel based system in mind, ...
1
vote
2answers
107 views

Is it OK to use the USB 5v pin as power source?

I am doing some stuff in my case and I need a power source for one LED from inside my case. I looked up and there are two +5v pins on a USB header inside my case. Is it OK to use them as power source?...
1
vote
2answers
303 views

What is the role of discrete resistors and capacitors in a motherboard? [closed]

I know the basic function of resistors and capacitors. I know filters, oscillators, one-shot, differentiator/integrator, ADC/DAC, power supplies, etc. But in a motherboard why are there so many ...
1
vote
2answers
5k views

Discharging capacitors on a computer motherboard for safety

A daycare in my city has taken a donation of desktop and laptop computers for the older children to take apart. I am concerned that the various capacitors would present a shock hazard for the ...
1
vote
1answer
683 views

Dysfunctional onboard LAN controller chip getting very hot, is it safe? [closed]

I have had an Intel LGA775-based motherboard (DG33FB) for about 8 years now, but for an year or so the LAN port was unreliable, sometimes working and sometimes not. No software solution was working, ...