Questions tagged [damage]

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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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43 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
61 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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47 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
83 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
93 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
429 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
61 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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70 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
46 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
58 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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43 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
127 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
232 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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57 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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80 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
472 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
168 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
158 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
109 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
493 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
111 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
313 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
130 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
64 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
4k 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
305 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
401 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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0answers
46 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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0answers
130 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
88 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
14k 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
72 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
214 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
244 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
74 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
146 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
6k 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 ...
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2answers
115 views

Can Micro-controller bear the voltage at its pins more than its rated voltage?

I have a micro-controller, for which i have a datasheet specifying the ac/dc characteristics of that mcu. But in this datasheet there are no absolute maximum ratings only the operating conditions are ...
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1answer
120 views

Drawing power from only one phase of a 3 phase alternator

Note: I am busy learning about 3 phase alternators. A lot of my understanding is theory so I'm running through scenario's for better understanding. Scenario: Lets say we have a 2KW-220V-50Hz 3 phase ...
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1answer
155 views

Can you identify these two SMD components? [closed]

A couple of components get knocked off by some loose elements during the shipping of some equipment. I'd like to identify the elements and solder in some replacement. My guesses: left one is a 270uF ...
3
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1answer
253 views

MOSFET mechanism of failure: was it the heat?

I am debugging a failed MOSFET (IRF6662), and in the process of doing so, am having difficulty understanding fully the thermal behaviour of the FETs. Two FETs used for DC switching both failed short ...
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1answer
58 views

Are there disadvantages to this method of testing building wiring after a lightning strike?

A lightning strike can damage wiring in a building. Specifically it can damage the insulation on the conductors, resulting in arcing and fire, either immediately or some time after the strike. I've ...
3
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1answer
72 views

Shipping & Handling Electronics & Electro-mechanical parts

What are common packaging(Shipping & Handling) guidelines (specs/stds) for Electronics & Electro-mechanical parts? Currently, working on adding onto our current generic guidelines for ...
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0answers
57 views

Which one is more damaging? overvoltage or undervoltage? [duplicate]

It is not easy to get the exact supply voltage required by loads. The supply is usually either a little bit higher or lower than desired. It is known that both over & under voltage can ...
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2answers
1k views

How exactly is an LCD damaged by DC current?

LCD displays are driven by AC waveforms. I've seen many references referring to permanently damaging them with DC current. When exposed to DC, LCD's fail and conduct excessive current. My question is: ...
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0answers
77 views

What happened to my Ni-MH battery?

I made a little custom data logger. It's powered by a rechargeable AA Ni-MH battery. Typically, it lasts about 2 weeks on one battery. Then it uses a low voltage cutoff to sound a low battery alert,...
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0answers
104 views

Help identifying IC damaged by wrong voltage

I accidentally fried an IC when switching out a power supply; sent 12V instead of 5V. I've been trying to find some information on this drive, a Corsair M500 240GB, (CT240M500SSD1) - maybe a datasheet,...