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Questions tagged [component-failure]

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4
votes
1answer
67 views

What's causing my buck converter's switching node to oscillate only some of the time?

We got an order of 24 PCBs recently, and one of them doesn't work. I'm trying to track down the point of failure, and it seems to be our 3V regulator circuit: At ~180ms intervals, the 3V output rail ...
0
votes
1answer
46 views

Will a start capacitor be damaged by an overloaded motor?

Background: A few days ago, the air conditioning unit at work began failing to start. Fans would turn, lights would be on, but no compressor start. I called a technician and he said the start ...
9
votes
2answers
188 views

Failure of LEDs in the wet — what's going on at the semiconductor level?

Recently I've come across two very different LEDs that have failed due to a soaking, but with interesting and almost identical failure behaviour. I'd like to understand what's going on inside. Once ...
0
votes
0answers
75 views

What damage occurs in an ESP32 when you power it with 5V

A colleague flashed the PIC MCUs on a batch of boards. However he didn't pay attention to set the Vdd when programming to 3.3V and used the default (5V). This caused the ESP32 on board to experience ...
0
votes
1answer
45 views

Redundant system question

so in short. I am building a redundant system of multiple atmega micro controllers. The way it works is that they are all connected to a single bar, when the system is booted, the first micro ...
0
votes
1answer
37 views

Protecting 0..10 Vdc PLC input from voltage divider failures

I'm working on an off-grid PLC based battery bank monitor and dump load controller to replace commercial units that don't work really well with our lithium ion battery bank. In addition, I plan to ...
1
vote
0answers
41 views

FMEDA failure mode distribution data

We are developing an automotive product according to ISO 26262 standard. For FMEDA calculations failure mode and failure mode distribution is required. Some sources to find these are IEC 61709 ...
1
vote
2answers
98 views

RF Attenuator Failure

I am attenuating an audio frequency (50 KHz) signal that is pulsed at 666 W for 300us with a period of 300ms. I estimated the power dissipated averaged over a period to be approximately: \$\frac{300 \...
1
vote
1answer
117 views

Short circuit between Vdd and Vss after high current through microcontroller clamping diode

When hotplugging a connector on my PCB, my microcontroller gets hot and a short circuit is formed between Vss and Vdd. One pin of the connector is the power supply ground, another is connected to an ...
3
votes
4answers
302 views

Can a surface-mount ceramic capacitor fail partially and intermittently?

My focus is on surface-mount ceramic capacitors. The obvious failure extremes are open and short. Other than these extremes, can the failure be that the effective value of the capacitor is either ...
0
votes
1answer
83 views

Sizing Transistors for 2.2hp universal motor controller

my background is mechanical and as you can see I have just enough electrical knowledge to be dangerous. I have an application where I'm trying to use 2xFDP51N25 in parallel to drive a (2.2hp) ...
1
vote
0answers
83 views

Failures on underside layers of a chip in IGBT power modules

Does somebody know how I can detect a layer of IGBT modules in which a thermal failure, e.g., voids, cracks, delaminations of solder joints, has taken place? We know there is fatigue in both solder ...
2
votes
2answers
387 views

relay contact fails (suspect sparking)

I have a relay which is rated for 30 VDC @ 10 A or 28 VDC @ 10 A (which appears on this relay module) and I am running 12 V @ 6 A through the relay and this solenoid. After a short amount of time (...
0
votes
1answer
58 views

Why is this IDT6116 SRAM chip overheating?

I am building a memory module for an 8-bit computer, and am running into an issue. (Following this schematic, but using an IDT6116 instead of the AS6C6264 shown) The chip is receiving 5V, which is ...
1
vote
0answers
97 views

Mystery component

I have this SMD component that popped. I cant seem to identify it properly. Could you please help? I tried to look it up, but had no luck. It is a led driver board.
3
votes
1answer
205 views

What's the physics behind LEDs wearing out?

Short version: I'm thinking about running LEDs in a potential over-current setup, but with a PWM-based supply. Will the LEDs suffer an early death? Said otherwise, do LED die of overheating, or really ...
2
votes
1answer
789 views

2N7000 Mosfet destroyed during soldering?

I have been having problems with 2N7000 mosfets that perform perfectly on the breadboard, but when moved to a perfboard start failing. I'm on my third iteration now, replacing all mosfets, between ...
0
votes
0answers
111 views

High value resistors go higher in value; high voltage resistors go higher in value

During repairs of vintage hifi I occasionally observe two failure modes with resistors: High-value resistors, say hundreds of K-ohms, go 30-100% higher in value. Resistors connected to relatively ...
1
vote
1answer
761 views

NTC Thermistor Failure Over Time

I am using 0402 nominally 10k\$\Omega\$ NTC thermistors that are soldered onto a flex PCB which is then adhered to the point of interest in an Alumina based thermal adhesive. The thermistors have ...
0
votes
0answers
322 views

Safe MOSFET fail open mode

I am working with a circuit that is supposed to act like an incandescent light bulb (ilb). I will use a power resistor to eat the power the ilb normally would. The circuit will have the possibility to ...
0
votes
3answers
224 views

Failing to understand and to fix a PWM spindle controller circuit

My CNC controller worked for many hours without trouble. But recently the resistor R5 (red circle) started to melt each time I switch my CNC spindle on, and even at low RPMs. It is 100 ohms, compared ...
0
votes
4answers
233 views

Failure mode of TTL device

A question came up about common failure mode of a transistor. Searching past posts I actually found varying answers, either open or short. Maybe it depends on the application, and I'm missing ...
5
votes
2answers
591 views

Electronic wearing of a printed circuit board?

I was told that electronic components and printed circuit boards have a limited lifetime. This is backed by several questions and answers: https://www.quora.com/Do-circuit-boards-have-a-useful-life ...
1
vote
1answer
56 views

Capacitor between boost and sw pin

I want to use THis buck regulator and i was wondring what is the function of the capacitor between the Boost and the SW pin ? And What happen if i choose to not add this capacitor ?
0
votes
1answer
45 views

Identify S447 T0220 component

One component on this board has eluded me. It is marked S447 horizontally at top, the letters MEX down the right an J6 at the bottom. The T logo is stylized with a swooping top. Searching for the ...
2
votes
2answers
182 views

LED lighting that lasts longer than me [closed]

My research has indicated that failure in LED lighting (incandescent replacements) results from failure in the support components rather than the actual LEDS themselves. How can I build and/or modify ...
1
vote
2answers
566 views

LM317 explosion

I was trying to make 1A dummy load using lm317 (didn't intend to use it,just trying!). So, I connected the circuit as shown : I put 1 ohm resistor as a load and another 1 ohm resistor instead of R1, ...