Questions tagged [damage]

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69 views

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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24 views

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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38 views

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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2answers
81 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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43 views

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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49 views

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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74 views

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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43 views

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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1answer
86 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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0answers
58 views

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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0answers
38 views

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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0answers
63 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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1answer
78 views

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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53 views

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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1answer
88 views

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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2answers
96 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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2answers
886 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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1answer
79 views

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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97 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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1answer
52 views

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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1answer
60 views

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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45 views

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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1answer
161 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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3answers
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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1answer
283 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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59 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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81 views

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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1answer
1k views

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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2answers
289 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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2answers
350 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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1answer
144 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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2answers
800 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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1answer
127 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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1answer
952 views

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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1answer
141 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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1answer
69 views

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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3answers
5k views

Is this resistor leaking? If so, is it a concern?

I found this resistor on the control board of an old Whirpool washing machine: Is that fluid leaking from the resistor? (Why would that happen?) Could it be something like stray epoxy or a chemical ...
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0answers
428 views

How to clean circuit damaged by bleach?

I was trying to remove stains on a fiber optic party tie using bleach, however it seems a small quantity has leaked inside the controller overnight, causing some corrosion and preventing it from ...
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2answers
424 views

How long can equipment go unused before powering up runs the risk of damage?

I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming ...
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49 views

Ignition coil testing

Will ignition coil internal carbon tracking/damage be evident through conventional ignition coil tests? eg multimeter, 12v battery arcing
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180 views

Current transformer damage

Can a current transformer be damaged with an open secondary coil even if it is powered with an extremely low current? e.g a small spark gap is made, though no plasma stream is created due to the ...
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1answer
90 views

Increased current consumption of micro-power devices

I've been working with microwatt and nanowatt power consumption devices for a while and I've mentioned that sometimes, due to unknown reason, current consumption increases in order of magnitude. ...
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3answers
20k views

Bad effects of coiling electrical cables [duplicate]

I have a desktop computer and a lot of external hard disk cases. I coiled all cables to make them organized and easy to clean. But an electrician told me; if you are using a cable, coiling (wrapping) ...
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1answer
73 views

Correlation EMF / DNA

What is the current state of independent (of producers) studies about the correlation between EMF (with particular reference to mobile devices) and interruption of human DNA? Are the declared SAR by ...
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2answers
250 views

Negative gate SCR

I've accidentally supplied the gate of an high power phase control thyristor (Vdrm=5200V and It(rms)=6500A) with a negative current (about two times the trigger current and four times the trigger ...
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0answers
270 views

Gate of a transistor and mosfet damaged

In my schematic, I found that the base of transistor Q7 (2n2222) was damaged. I tried to replace it with a BS170 MOSFET, and the same thing happened where the gate was damaged. The microcontroller ...
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4answers
5k views

Is a capacitor bad when it looks like this?

Hello I am new to the electronics field. I am looking inside of one of my synthesizers and I see some capacitors (I think they are Mylar, correct me if I'm wrong) that look like this. I know it is a ...
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1answer
77 views

Can parallel addition of a bigger capacitor damage the smaller one?

I have connected big capacitors to the speakers to increase the bass. Now, after months of using, I notice that one of the speakers sounds 2x low. I ejected those big capacitors, still the same. I don'...
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1answer
232 views

Identifying damaged, burnt out, or missing components [closed]

Is it possible to deduce the identity of damaged, burnt out, or otherwise missing components (or suitable substitutes)? For example, below is the PCB of a 2 speed electric razor I've disassembled. ...
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5answers
7k views

How to solder this pin

A customer that has bought this device years ago somehow managed to fry this IC and he tried to replace it himself. That did not work out though and he messed up the track for good. He sent it to us ...