Questions tagged [motherboard]

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1answer
64 views

Resistor causing problems when in series with LED

I am wanting to dim the light on my computers power light, its just a 5mm LED what i am guessing gets 5v from the motherboard to power it The problem I am having is that when adding a 100R resistor ...
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3answers
47 views

Can I somehow control a PSU-powered fan using a 4-pin fan output on the motherboard? [duplicate]

I have a 12V 29.4W 3-wire Delta Electronics fan that I want to power using an EVGA 750 G3 PSU and control via one of the 4-pin fan terminals on an MSI MSI Z390-A PRO ATX LGA1151 motherboard. Not ...
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1answer
57 views

Beginner questions on some SMD components in phone motherboard

I'm trying to understand smartphone motherboard components and have a few questions that might be easy for some of you to answer. Please refer to the attached image for the question numbers: Are ...
6
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2answers
998 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 ...
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3answers
142 views

Identify components on computer motherboard - cylindrical and cube shapes

I'd like to know what components are the ones with blue numbers and the big ones behind them: The latter components I'm talking about:
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2answers
171 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 This is an outdated ...
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1answer
37 views

Where does a wire labeled “3G” must be connected in turbo x notebook? [closed]

I got angry and punched my Turbo x notebook and it shutted down. When I opened it again I got the famous error 0xc00000e9. So I thought that possibly a cable is disconnected or the hard drive is ...
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1answer
77 views

Using 5V motherboard pin

I want to create an electrical circuit that powers up the computer when a sensor is activated. This sensor is in parallel with the power switch button. As far as I understood from reading on ...
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3answers
63 views

ESD mats & motherboard safety

Let’s assume bog standard two layer ESD mat with static dissipative top and conductive bottom layer, with resistance to ground somewhere between one mega-ohm to one giga-ohm and with both a mat and ...
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0answers
79 views

What do these capacitor markings mean?

Aluminum Organic Polymer Capacitor So to be really honest, I did blow an capacitor a while back by applying the wrong voltage to it, and had ever since then trying to decode this info to track down an ...
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0answers
527 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 ...
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1answer
438 views

Testing 8 pin P-Channel MOSFETS on Laptop Motherboard

My laptop died recently and I’m testing the motherboard. I’m led to believe these two MOFSETs on the board may be part of the issue PQ301 and PQ302. Using a multimeter continuity and diode mode; ...
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1answer
38 views

USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
1
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2answers
137 views

Linux (OS) on Custom Hardware (Custom Motherboard) [closed]

We are designing and producing our custom high-speed boards consisting of FPGA and gigabit ethernet signals. Hence, we are not professional for high-speed motherboard design but know some issues like ...
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1answer
438 views

Source of 5v power on a typical motherboard

Forgive me for asking an interdisciplinary question. I need to get more 5v power out of a desktop power supply to power a bunch of peripherals. These supplies can go as high as 1600w but the power ...
2
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1answer
869 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 ...
2
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3answers
357 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 ...
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2answers
212 views

Looking for a motherboard CPU Power MOSFET replacement - is this OK to put not exact the same?

I have a motherboard with broken PDC3094X (Potens Semiconductor) in VRM circuit. I cannot find the replacement with exact same parameters and the original part is impossible to get. I don't have a lot ...
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0answers
40 views

Changing flex connector on LCD motherboard

The flex connector from a Philips 236v4lhab motherboard has some of its pins broken. They are touching each other (8,9,10). Can't show it on the photo but have tested with the voltmeter. I'm wondering ...
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1answer
434 views

How to determine IBM USB 6 pin header pinout?

I have two IBM Power 7 machines - Power720 and Power740 (8202-E4B and 8205-E6B) and both have an internal USB 6 pin header (labelled J3_TAPEUSB_SIGNAL). These are for connection to a single device (...
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1answer
141 views

What is the difference between a BIOS chip and a PCH

From what I can gather, the BIOS chip is a loadable memory space that handles initial I/O, system checks and CAN configure certain things like power states and clock rates, before handing operation ...
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2answers
158 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 ...
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2answers
321 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 ...
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3answers
75 views

Connecting a single LED to Motherboard CHA Fan Header

I've been reading that it is possible to connect a LED to the motherboards CHA fan controller. The LED I had in mind was this Online people have been saying you would need a resistor as the voltage ...
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1answer
229 views

Mainboards ATX “PWR_OK” signal fried [closed]

I've been struggling here trying to find out what exactly went wrong, but I just can't. I messed around with a power supply and decided to wire up my own with 3.3V, 5V, 12V and all other connections ...
1
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1answer
56 views

How does integrated displays controlled by the computer?

Consider a run off the mill pc: lcd displays connected, you have brightness control in the menu of the lcd. And some other stuff like color temp and modes. Now consider a laptop, AIOs and kiosk PCs. ...
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2answers
270 views

How do we find the bandwidth of a bus?

The data width and cycle rate are used to determine the bandwidth, or the total amount of data that the bus can transmit. An 8-bit bus (1-byte data width) that operates at a cycle rate of 1,000 MHz (1,...
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2answers
106 views

DIP (dual inline package) [closed]

searching on the net, but couldnt understand for what is used DIP? Is it RAM? Will be glad for your answers.
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1answer
71 views

Motherboard's 4 pin DC input polarity

I have a motherboard, that requires a DC input. The manual has this: I'm trying to find a power brick, but all bricks I can find usually have +12V/-12V on pins or shell and no ground. Can I use them?...
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3answers
763 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 ...
2
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0answers
117 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 ...
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1answer
141 views

transistor replacement dp35dp

Hello I have an old Intel Motherboard DP35DP, I was using this board as a file server using RAID (Its crucial to get that RAID array working again). It seems like the culprit is a transistor, its ...
4
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1answer
316 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 ...
2
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1answer
459 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
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2answers
245 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 ...
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3answers
1k views

What edge connector for prototype board?

For personal hobby projects I'm using prototype boards like this (2.54 mm pitch): I connect them using wires, which is a mess. I want to use a backplane with female edge connectors, for a solution ...
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2answers
182 views

TPM 3VSB power capabilities

I have a question about Trusted Platform Module header on PC motherboards. I want to install ESP8266 (standalone) inside of my PC, I know of 5VSB the the PSU supplies, but after looking at my mobo ...
1
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1answer
101 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 ...
0
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1answer
193 views

Replacement for three terminal capacitor

One of capacitors on my IBM 5150 motherboard burned out, so, I'm looking the way to replace it. I tried to google to identify this capacitor: It looks like it's a 10 μF 16V three terminal capacitor, ...
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1answer
63 views

Will a laptop works with missing GPU Power rail? [closed]

I have a skylake laptop with a dedicated graphics, the Mosfets on the buck converter are shorted (at least one of them) so if i cut the 1v gpu power rail will the laptop works again? Thanks in advance....
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2answers
120 views

Board to Board connection for RF and high-speed digital signals

(I hope this is not regarded a "shopping or buying recommendation" question - in my opinion it is not). In order to split a larger project into more tractable and flexible sub-blocks I create two ...
3
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3answers
581 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 ...
2
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1answer
188 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 ...
1
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0answers
125 views

Is it safe to plug a computer into itself? [closed]

I have a USB dongle (with microphone and headphone 3.5mm jacks). Is it safe to plug the headphone out into my motherboard microphone/line in? Would there be any grounding, feedback, impedance ...
8
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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 ...
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1answer
96 views

Skewed capactior on a motherboard [closed]

I've bought a new motherboard, and after unpacking I realized that one of the capacitors is a bit skewed: Can it cause any problems? Should I request RMA?
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2answers
528 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
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1answer
156 views

Pico-itx motherboard Powered With Battery

I want to built a portable pc system. I am interested in the Pico511 pico-itx motherboard. My concern is how to run a system like this on battery. It's using 12V and for the top configuration it ...
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2answers
396 views

Can I use a tactile switch as computer power switch? [closed]

I was thinking of replacing my broken power button in my CPU with a tactile switch connected to the power cord on the motherboard, but I was wondering if that would work without any harmful ...
17
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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 ...