Questions tagged [motherboard]

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1 answer
95 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.
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-3 votes
1 answer
108 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 ...
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0 answers
43 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 ...
5 votes
0 answers
78 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 ...
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2 answers
249 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 ...
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4 answers
112 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 ...
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0 answers
37 views

Can I delay a screen repair after it’s been opened?

I’ve begun replacing an IPad Air Gen 1 screen, have done it many times before however this time I realised I was out of Kapton tape (so that I can hold the home button connector in place) and so now I ...
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0 answers
198 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 ...
2 votes
1 answer
194 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 ...
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26 votes
1 answer
1k 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 ...
-1 votes
1 answer
137 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....
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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 ...
1 vote
0 answers
88 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 ...
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2 answers
161 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 ...
8 votes
3 answers
983 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 ...
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0 votes
4 answers
142 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?
2 votes
2 answers
188 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 ...
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0 votes
1 answer
73 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 ...
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0 votes
1 answer
56 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?
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0 answers
59 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 ...
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0 votes
2 answers
447 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: ...
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1 vote
1 answer
97 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 ...
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0 votes
1 answer
124 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 ...
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0 votes
1 answer
134 views

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?
-2 votes
1 answer
76 views

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. ...
0 votes
1 answer
108 views

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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0 votes
1 answer
70 views

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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1 vote
0 answers
71 views

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 ...
0 votes
2 answers
185 views

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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0 answers
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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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2 votes
1 answer
663 views

What is the power voltage pin outs for a Playstation 5 PS5 power drive connector on the motherboard?

I ripped off the drive power connector from the motherboard on a PS5 and looking to get this repaired, but I need to find the power pin outs in order to fix it. Where can I find the voltage pinouts ...
4 votes
4 answers
180 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 ...
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0 answers
248 views

PWR ON motherboard with Touch sensor TTP223 and Transistor

I have a TTP223 touch sensor, a BC347 Npn transistor and 10Kohm resistor. I want to make a touch button as substitution for my pwr physical button on the case of my pc. On the motherboard I have 2 pin,...
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1 vote
2 answers
98 views

Can I replace a board fuse like the one in the picture with a radial one?

The fuse on one of my commercial printers blew. See picture below. I am planning on replacing it but cannot find an exact fit. The closest I can find is another 400mA / 72v fuse that is labelled as &...
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0 votes
1 answer
109 views

What's the component name/part number of a motherboard audio jack?

I've de-soldered a triple 3.5mm audio connector thing from a dead motherboard and would like to use it for a small project. However, I have no idea what it's called, there's no part number on it, and ...
2 votes
1 answer
186 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 ...
0 votes
2 answers
55 views

Quick Question - What is the TPM Connector Size?

Anyone know the connector size for the TPM port? I wanna take the 5vSB power from it. If it helps its a MSI B450+ Tomohawk. Thanks! P.S. I have searched but TPM means too many things! Edit: WHOOOOOPS! ...
1 vote
1 answer
134 views

using citric acid alcohol solution to clean rusted terminals

I used to clean old computer sockets and terminals with citric acid solution in alcohol. It worked fine for long time, but for the tiny connectors of DIMM Ram sockets it works for a very short time ...
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-1 votes
1 answer
55 views

How does a motherboard convert the input voltage to the 12V of the PCI? [closed]

Has it a DC/DC converter inside? Are the 12V guaranteed to be 12.0V sharp?
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0 answers
302 views

Help identifying components on Sony PS Vita 2000 motherboard

I need help identifying 2 components from a Sony PS Vita 2000 motherboard. One is a chip with code AG8 only (has 5 pins each side). The other one is like a 4 pin resistor. No resistance between 2 pins ...
0 votes
1 answer
89 views

Can anyone help to id the component from la-d933p motherboard?

The component is placed on dell laptop la-d933p motherboard And is connected to AON6992 mosfet
0 votes
0 answers
57 views

Generic tablets and single board computers

I've been pondering the idea for a while now in regards to a project I've had in mind. Essentially, I was wondering how I would go about obtaining generic tablet/phone motherboard designs? Would I be ...
1 vote
0 answers
118 views

Winbond v/s ITE chip

My ASUS motherboard has both a winbond 25q64fvsig and a it8995e-128 chip. In a repair shop in a country I was at the time, they flashed the wrong ASUS BIOS version. I tried flashing the right version ...
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2 votes
2 answers
815 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 ...
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0 votes
0 answers
56 views

Simple question about flow of electricity

I wanted to modify my power-on switch on my PC and decided to add few switches and LEDs before it powers up. Its more of an aesthetic modification but I have encounter one problem which is, shown in ...
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0 votes
2 answers
95 views

Is unplugging computer power cable from PSU the same as electricity outage?

I am not sure if they are the same, but something puzzling just happened. My dell precision workstation 2007 has been fine ever since, with many, many power outages over the years. But there is a time ...
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0 votes
1 answer
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Which insulating tape and when?

There are quite a few tapes out there, from the plain black electrical tape to different color variations to Scotch 33+, 77, 88 to Kaptons (polyamide), I have also seen some velcro type wraps which ...
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1 vote
1 answer
290 views

Idea for a PC bios beep buzzer

Hi I want to make a buzzer for my PC motherboard. Similar things like this: https://boip.in/home/rajiekart-pc-motherboard-internal-speaker-bios-alarm-buzzer-1-pcs-pack?gclid=...
2 votes
0 answers
86 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:...
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2 answers
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What motherboard components can I safely conformally coat and will this prevent condensation damage?

I plan on building and installing a small computer in my car for multimedia purposes. Since the only space I have for it is under the passenger seat and since the temperatures vary between -20 to 35+ ...