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Questions tagged [motherboard]

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Design an intel x86 motherboard for NAS [on hold]

I'm interested in hiring for designing a motherboard for NAS. the primary requirements for such a motherboard are as follows: Intel J3455 or J4x05 CPU at least 4 Sata ports or higher Two * Gigabit ...
0
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1answer
43 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; ...
0
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1answer
33 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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1answer
61 views

Linux (OS) on Custom Hardware (Custom Motherboard)

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 ...
0
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1answer
68 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
118 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
89 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 ...
0
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2answers
75 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
37 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 ...
1
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1answer
150 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 (...
0
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1answer
43 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
103 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
156 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 ...
0
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3answers
56 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
122 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
52 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
104 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
93 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.
0
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1answer
42 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
731 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
103 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 ...
0
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1answer
74 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
282 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
309 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
165 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
630 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 ...
0
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2answers
119 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
90 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
144 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, ...
-1
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1answer
59 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....
1
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2answers
107 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
433 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
173 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
120 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 ...
-1
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1answer
90 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?
1
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2answers
524 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
118 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 ...
0
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2answers
327 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 ...
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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 ...
0
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1answer
291 views

How much current the PS-on pin on the motherboard's power connector can sink?

How much current the PS-on pin on the motherboard's power connector can sink? can it sink 100-200mA? (to activate a relay/solid-state-relay when the motherboard wants to turn/keep on the computer) (...
0
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3answers
2k views

connecting a LED to a PC case fan header

On my motherboard (ASRock B150M Pro4S/D3) i have an unused 3-pin case fan header. Can i use it to drive a single LED with only a resistor in series? The fan can be configured in the BIOS to change ...
0
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1answer
89 views

Using “Video 90” spray to clean up a cell phone motherboard

Can I use Video 90 Spray with electronic motherboards, like smartphones? My cell phone was dropped in water while the battery was out, now I have dried it out using rice and instant oat! Before, ...
0
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1answer
68 views

Cost of expandable memory [closed]

Given two computers: Has X gigabytes of RAM, that's the amount it ships with and that's all it will ever have, it can be designed around that number in whatever way is most efficient, solder chips ...
0
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1answer
152 views

Switched 5V Power Source XBox 360

I am looking for a 5V power source for some LEDs that I want to put in my XBox 360 slim. I have soldered them to 5V on the USB ports, but they have constant power, and I only want power when the ...
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2answers
2k 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 ...
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3answers
903 views

ESD damage after touching metal PC case?

When i'm tribocharged and then discharge to a graphics card, i can kill that device. Let's say i'm at -2000V, compared to my motherboard, and i touch the metal traces around the board's screw holes. ...
2
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1answer
2k 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
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1answer
2k 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 ...
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2answers
989 views

MOSFETs and Chokes on Computer Motherboards

There is a lot of conflicting information on the internet about what role these play in CPU power delivery. A lot of people online say that having more MOSFETs and chokes results in cleaner power ...