Questions tagged [damage]

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Higher PWM frequency than rated for device

I've an electronic speed controller (ESC) rated for a maximum PWM frequency of 48kHz. As I was working on a project I was generating PWM. This PWM signal was connected to the ESC. After I noticed that ...
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3 votes
2 answers
241 views

BJT collector power limit in pulsed usage?

Assuming that my circuit respects the voltage, current, and thermal limits of a BJT, can the device be electrically damaged by exceeding an instantaneous collector power limit? In other words, are BJT ...
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Component identification in DW01 supporting circuit

I have a nice bike light, a Ravemen PR1200 After a couple years of excellent service, the battery life dropped off and it started failing on really cold commutes. So I attempted to replace the ...
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1 answer
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Is a damaged charging cable safe to use? [closed]

I have a M1 Macbook Pro 2021, 14". The charger that comes with this device is the 67W adapter and a USB-C to MagSafe3 adapter. Unfortunately, today I didn't see the charger on the ground and hit ...
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1 vote
1 answer
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LED Dimmer circuit accidentally damaged

I am currently working on a prototype system that uses these 3w LED drivers (I am using the one with the picture at the right). It uses the XL4001E1 CC DC-DC converter capable of outputting 700mA to ...
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1 answer
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AMD 5600x microprocessor substrate damage

I hope this question lies within the guidelines. I have acquired this AMD 5600x microprocessor for a very low price. It was dropped on the corner (see picture) where we can see some delamination. The ...
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2 votes
0 answers
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I2C communication pin and/or device getting damaged

I have a Raspberry Pi communicating with some I2C client devices. Occasionally either the I2C client device fails or a Raspberry Pi pin (one of the I2C pins) is damaged. The only thing I can conceive ...
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What kind of component is this, and is it damaged?

My central heating controller stopped working. It's essentially an AA battery powered device with a thermistor, some buttons, and an LCD screen, which lets me program desired temperatures for various ...
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2 votes
3 answers
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I have some salvaged PNP transistors, should they conduct forwards past a particular voltage or are they damaged?

I have salvaged two A1490 transistors from an old amplifier. Both of them, if presented with a potential difference across the collector and emitter above about 13.5 V start conducting, even if there ...
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1 vote
1 answer
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Why does broken monitor have vertical lines [closed]

I unfortunately dropped a pointy object and it pierced a tiny area of my monitor (AOC U32E2N). I was surprised to see that the whole area of the impact (where physical damage can be seen) is ...
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1 vote
1 answer
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What’s the likely cause of ‘buzzing’ from this hi-fi speaker? [closed]

Something has happened to one of the drivers in my speaker and it’s now ‘buzzing’. (Our cleaners could have knocked the speaker over). There’s no obvious (to me) signs of damage having examined the ...
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-1 votes
1 answer
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Is there a chance that a DC/DC controller was damaged when a bad feedback network caused its output to exceed its absolute max limit?

I'm currently debugging an issue with a DC/DC controller. The part is a LTC3833. It turns out that the engineer who was working on this accidentally pointed to incorrect part numbers for the passive ...
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151 views

Is it possible to damage a PCB by plugging an USB 5-pin header the wrong way?

I am using a Cliff CP30100 dual USB socket to easily switch between two PCBs (see wiring diagrams). On the inside, there is an USB-C to 5-pin cable for one PCB, and a Mini USB to 5-pin for the other. ...
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1 vote
2 answers
73 views

Which components tend to damage first of a power supply for high voltage?

Which components tend to damage first of a power supply for a voltage spike or surge?
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1 answer
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What is the name and function of these components?

Following are two pictures of a smartphone's main board (Moto G8 Plus). The first one is for reference; the second one is the one I got to repair a phone. Questions What are the golden sheet (...
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Implications and cause for static discharge

For months, I've had a potential buildup culminating in static discharge when touching the chassis of my macbook pro at ONE location. No source could be identified (no ground leakage – I checked with ...
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Can I use an Apple charge Cube (5W power) through a Ripcord 9V to USB to feed a Roland SP 404 (2.7 W draw) Safely?

I am asking this as I want to be extra sure this setup does not damage my 404 Sampler as its an expensive item of mine and it's very dear to me so I want to be careful. Here is the scenario: I have ...
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2 votes
2 answers
139 views

Expected behavior for damaged transistor

The generic question I have is what's the "expected" behavior for a damaged BJT. Let me add more color.. I was trying to fix my kid's toy where a motor would run even when it wasn't supposed ...
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0 answers
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What check can Ι perform to verify that a load cell is operating properly?

About five years ago I was tasked to develop the software for a small custom made testing machine (everything is custom-made from frame, to the measuring system). Last year, I was volunteered to &...
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1 vote
0 answers
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PCBA failure - white "fluff"

I have a PCBA that seems to have failed due to poor wiring (no water damage). The screw terminals are for 230V AC input and electrical load relay. What isn't clear to me is what exactly is the "...
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Identify and source replacement common-mode noise choke

I have a circuit where the marked inductor common-mode noise choke in the image below is damaged. I am having massive trouble sourcing this inductor common-mode noise choke anywhere. No results on ...
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Substitution for 0.1Ω 2W metal film resistor?

I'm attempting to repair a Pure Sine Wave Inverter. I need to replace a damaged 0.1Ω 2W metal film resistor. I found the part that should work on digitkey: https://www.digikey.com/en/products/detail/...
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2 votes
1 answer
167 views

SMD SOT-25 identify component

Can I ask for help in identifying the following SMD component? Package is SOT-25. Marking is bPCGD . Probably is voltage detector but I dont know his parameters. It is a component of mainboard IP ...
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Repair pads on PCB

I've accidentally used too much force on the board while trying to remove a flex connector and so I've removed a lot of PCB pads as well (see image). I have a new flex connector, but I do not have ...
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1 vote
0 answers
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Water damage repair on solders

So this is the cicuit for a 1h0257j VolksWagen polo vacum pump for central lock. I got it for practice since it was replaced. The question the problematic part seems to be a burned soldering, it is ...
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1 vote
0 answers
115 views

Can I bypass a trace from the diode to the solder point with wire?

I'm working on the button/power motherboard of an X-Box one's controller - the menu (start) button doesn't work. I think there might be damage to the trace when I followed the trace to the solder ...
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0 votes
1 answer
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Repair MRAM that's been exposed to a magnetic field

Is there any way to repair MRAM that has been exposed to a magnetic field? I've got a bit stuck (3rd bit) on my MRAM. Probably due to exposure to a magnetic field. Is there any way to fix this short ...
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Requesting help identifying potential damaged resistor on PCB

The picture is a motor control board which recently failed. The digital console indicates some problem communicating with the motor. Inconsistent power supply and moisture MAY have played a factor. ...
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1 answer
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Over voltage protection IC keeps burning

I am currently working on a project where over voltage protection is necessary. I made a test circuit using an LP5300 (SOT23-6 type.) https://datasheet.lcsc.com/szlcsc/1912111437_LOWPOWER-...
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-1 votes
2 answers
99 views

What kind of camera could work inside a microwave?

I want to record video inside a microwave, is it possible? What if it was hid behind a shield or the same galvanized material as the door? The detailed structure may completely ruin visibility tho
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7 votes
2 answers
2k views

Can continuity test cause component damage?

In order to test some tracks on a mounted PCB, I would like to use a multimeter for continuity test. However, then I measured the open-circuit voltage of two multimeters at hand, and the results were:...
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1 answer
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Can anyone help to identify this blown MOSFET? Top markings seem to include F50, "ON" in a circle, 3N and "RE4T" in a circle

I am trying to repair a PCB out of the welder. One of the problems I have found is a blown MOSFET. I have tried searching for a replacement with no luck, as I don't have a complete code. I have posted ...
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129 views

Scratched capacitors at the top. Should I care?

I've ordered a couple of big capacitors and one of them (the one on the right) seems to have been repeatedly hammered by the other's leads during transportation. So much so that it has some ...
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1 answer
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Do I have to protect the CD4013 outputs from short circuits?

I'm trying to determine whether a CD4013BE ("CMOS Dual D-Type Flip Flop") can take damange if one of the outputs (Q or Q-bar) is set to high, but shortened to ground (or vice versa) with no resistor ...
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1 answer
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Does water damage explain this issue?

I posted previously that the hot water button (PA in red) no longer causes the hot water solenoid (Eac in red) to dispense water. It now causes the left coffee group solenoid (G1 in green) to dispense ...
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0 votes
0 answers
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How did an LED go from being a point source of light to an extended source?

A night light with an LED under a dome screen projected a sharp image initially, but a blurry image after the first night. The screen appeared to be undamaged, this led me to believe that the LED ...
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2 votes
1 answer
241 views

Accidentally connected a GPS antenna to a cellular connector and a cellular antenna to a GPS port. What can go wrong? [closed]

I have two ultra small/sub-miniature coaxial connectors on my circuit board - one for a cellular (4G) antenna and one for a GPS antenna. I accidentally connected the cellular antenna to the GPS ...
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9 votes
3 answers
1k views

"recommended that CLK begin toggling within 150 ms ... to ensure long-term reliability of the device" -- why?

In Intel's Pentium Processor Family Developer Manual, regarding the CPU clock, it says that "it is recommended that CLK begin toggling within 150 ms after VCC reaches its proper operating level. This ...
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4 votes
1 answer
363 views

Can capacitors be damaged by a DMM in continuity mode?

Some multimeters have a pretty high open circuit voltage in continuity test mode and resistance mode (possibly to improve SNR?), but they are current limited. For example, the Fluke 87V behave like an ...
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0 votes
0 answers
64 views

Does this (seemingly) corrosion create problems for the operating of the chip?

We have a PCB of a VME machine of ours and it has some kind of white corrosion on it. Does this impact the functionality of the machine and what could it exactly be?
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1 vote
0 answers
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How could this capacitor have been damaged?

During testing, a capacitor was found to cause an intermittent failure - going short circuit when heated. The capacitor style is a through hole, radial lead, CECC rated 68nF MLCC. Our supplier makes ...
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2 votes
1 answer
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Can WD40 be used to mitigate water damage on electronics?

I've heard the advice that WD40 is designed to repel water, and hence, it can supposedly be used to mitigate water damage in electronics. Such as for a device that was submerged, instead of simply ...
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2 votes
2 answers
442 views

How can you damage DMM if you haven't discharged a capacitor?

Hi, I measured capacitance on some capacitors using my UNI-T 139S True RMS Multimeter without discharging them first. To be clear, I don't even know if they were charged because they are mounted on ...
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0 votes
2 answers
636 views

Is this Bad Capacitor repairable on this power supply?

A capacitor blew on my B-Tron 16-8-1 power supply. When I removed the cover and unseated and reseated the fuse. The power supply began to function again. BUT the power it was giving to each channel ...
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1 vote
1 answer
158 views

LM2776 gets damaged after some time

It is almost the reference design from the DS. The only differences are those quite large inductances I had to add to remove the noise. The neg voltage is used to power RR OPamps feeding the ADC the ...
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0 votes
2 answers
1k views

Mains AC Reverse Polarity - Has this damaged my fridge/freezer PCB? [closed]

In the UK, I had a smart meter installed a few weeks ago. My 4 year old Panasonic fridge/freezer (NR-B53VW2-WB) was working fine before the electric meter switch. After the install, after the engineer ...
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5 votes
1 answer
153 views

Can a solar inverter be damaged if installed capacity is much larger than demand?

I had a dispute with my fellow. In his opinion, a power inverter can be damaged if the load is much lower (e.g 100W) than installed capacity (e.g. 10kW) of the solar system. I am of the opinion that ...
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1 vote
1 answer
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How to generate heat using a battery and a wire

If i connect the positive and the negative terminal of the battery with a wire, the wire will turn red and generate heat.This creates a short circuit.This can damage or explode the battery?Is there ...
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1 vote
1 answer
165 views

Arduino died when grounds got disconnected

Alright bear with me since English is not my first language and it's my first time posting here. So I was using my Arduino Nano (not genuine) to drive a single phase full bridge rectifier. The ...
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0 votes
1 answer
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Why are there air(?) bubbles within my LCD? [closed]

Photos: https://photos.app.goo.gl/BvqLVYkMBB7RjaMU7 (Nexus 9 Android tablet) My daughter's tablet is enclosed in a full-body case, so it's fairly well protected. Still, somehow, at some point I ...
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