Questions tagged [damage]
The damage tag has no usage guidance.
140
questions
-1
votes
2answers
92 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
7
votes
2answers
341 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:...
0
votes
1answer
59 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 ...
0
votes
0answers
56 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 ...
0
votes
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 ...
0
votes
1answer
57 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 ...
0
votes
0answers
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 ...
2
votes
1answer
119 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 ...
9
votes
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 ...
4
votes
1answer
216 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 ...
0
votes
0answers
55 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?
1
vote
0answers
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 ...
2
votes
1answer
326 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 ...
2
votes
2answers
136 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 ...
0
votes
2answers
130 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 ...
1
vote
1answer
98 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 ...
0
votes
2answers
335 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 ...
5
votes
1answer
107 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 ...
1
vote
1answer
183 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 ...
1
vote
1answer
126 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 ...
0
votes
1answer
63 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 ...
16
votes
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 ...
0
votes
0answers
246 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 ...
4
votes
2answers
399 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 ...
0
votes
0answers
45 views
Ignition coil testing
Will ignition coil internal carbon tracking/damage be evident through conventional ignition coil tests?
eg multimeter, 12v battery arcing
0
votes
0answers
114 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 ...
0
votes
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. ...
5
votes
3answers
12k 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) ...
0
votes
1answer
71 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 ...
0
votes
2answers
197 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 ...
3
votes
0answers
234 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 ...
5
votes
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 ...
0
votes
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'...
0
votes
1answer
127 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. ...
14
votes
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 ...
0
votes
2answers
105 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 ...
0
votes
1answer
113 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 ...
0
votes
1answer
154 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
votes
1answer
233 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 ...
0
votes
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
votes
1answer
71 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 ...
2
votes
0answers
56 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 ...
6
votes
2answers
927 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: ...
0
votes
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,...
1
vote
0answers
100 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,...
0
votes
2answers
4k views
Is it dangerous to continue to remove a slightly punctured phone battery?
I have been trying to replace the phone screen on a Galaxy S7, and therefore had to remove the battery in the process. While doing so, I saw a tiny spark and felt a weird smell. I can't see any damage ...
0
votes
1answer
80 views
(How) can I save my components after ESD accident? [closed]
In winter time I am often charged with electricity and frequently encounter esd during the days. I know I should have esd protection when working with electric components, but now it is too late:
I ...
1
vote
1answer
987 views
Covering electronic device with plastic film wrap
I hope someone can help here with an electronics issue I have.
I am currently shipping an electronics device, an audio reel to reel to be exact. It was suggested that I wrap it in plastic film wrap, ...
2
votes
1answer
130 views
Why a damaged LED was acting like a weird memory cell?
I remember playing with signal LEDs and observing what happens when I misuse them, and one particular LED behaved very strangely, as if it were stateful.
Using a drained 9V battery (that can only ...
0
votes
2answers
165 views
A situation regarding AVR and bad power grid voltage [closed]
I have a question regarding the following situation:
Some poultry farm has taken some serious losses when their diesel generator died, only being able to provide backup for 45 minutes and killing ...
