Questions tagged [failure-analysis]
The failure-analysis tag has no summary.
33 questions
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How to use the military handbook for reliability prediction of electronic equipment
I want to predict the reliability of the components for which I am using the Military Handbook — Reliability Prediction of Electronic Equipment (MIL-HDBK-217F, 1991, Department of Defense). Is there ...
- 425
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2
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Components failure sensitive to temperature?
Some hardware of mine fails and then works, in a strange way.
I have to switch it on several times, (number of times looks like depending on room temperature).
Question is: what components (or (cold) ...
- 149
4
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3
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538
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Relay seeming to weld/unweld randomly (and continuing to click when "welded")
Main question :
I'm observing some very strange behavior on some relays (NO) on our PCBs:
the relay sometimes stays closed when I turn it off from software (as if it was welded closed)
but I still ...
- 9,643
9
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1
answer
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Toasted PCB region of power amplifier
I was going to replace a relay on an Alesis RA-150 stereo amplifier (a common failure mode) when I noticed some scorched 2W resistors (R401 and R402) and what appears to be an almost burned area of ...
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1
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What is the most common CMOS failure mode in the wild?
When repairing electronic devices, I tend to see a significant bias toward modern CMOS ICs failing shorted to ground. In fact, I don't think I have ever seen a digital CMOS device that failed shorted ...
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2
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147
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After lightning and thunderstorm my STM32 chip got damaged [closed]
My STM32 breakout board was connected to a 15 V power supply which was then stepped down to 3.3 V by a buck converter.
After lightning and thunderstorm, the STM32 MCU got damaged but the buck ...
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1
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488 nm 30 mW 3.7 V laser: Is the driver or the diode fried at 9 V?
For a hobby project I'm doing, I accidentally gave my 488 nm 30 mW 3.7 V laser 9 V from a battery.
It appears to have died immediately.
Picture of similar laser (with housing) added for clarity. The ...
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1
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1
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Can an Hall effect sensor fail in a way that causes drift in the final measurement? [closed]
I am investigating the different failure modes of an Hall-effect sensor. The failure modes such as short or open circuit are easy to diagnose but I am not sure if the Hall-effect sensor can have a ...
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5
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What might cause these striations in this solder joint?
This is a 47 µF 1210 ceramic capacitor which failed. There is excessive leakage current through it and in the process of investigating, I found this unusual-looking solder joint:
We use a no-clean ...
- 35.8k
7
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3
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N-MOS failing short on my PCB
I'm currently testing a PCB I designed. One of the MOSFETs, Q5, failed yesterday for the 3rd time, and I haven't managed yet to find out why.
Main facts:
N-channel MOSFET: CSD19538Q2T
Rated (never ...
- 9,643
7
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1
answer
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How can I verify or measure faulty (suspected cracked) capacitors?
I have some devices which operate at very low average currents of about 6 µA at 3 V DC. This is to ensure multiple years of battery life. However every now and then I encounter units which have ...
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2
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How to open hermetic TO packages?
I would like to open a TO-18 can to look at die-bonding/heatsinking and do some electrical experiments with increased airflow. Is there a non-destructive way to do this?
My only thought is to drill a ...
- 916
2
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1
answer
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SMPS Regulator keeps blowing
First Time for me posting here.
Recently I decided to perform a recap on an 20 y/o old SMPS, which is used in a digital mixer. The recap went without any complications. I followed the guide I found ...
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Burned motor controllers: possible root causes analysis
On a submarine robot we built, during an operation, we recently had 3 defect thruster motors (the internal power PCBs have many burnt components, 2 of the motors cracked open due to internal pressure)....
- 9,643
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Why did my LED drivers blow up?
I recently designed my first PCB, which houses LED driver circuitry for some custom lighting. I fastidiously followed the driver's datasheet (Diodes Inc AL8862QSP-13) in designing the circuit: making ...
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