EEVblog 1486 - What you DIDN'T KNOW About Film Capacitor FAILURES!Vote
You might think you know how film capacitors fail and degrade in capacitance over time - self-healing due to surges, right? WRONG!
Capacitor expert and AVX Fellow Ron Demcko confirms what's really going on after a teardown of some failed and one good polypropylene X class capacitor.
00:00 - Teardown of a some failed film capacitors
00:52 - Self Healing and drop in capacitance
01:44 - Capacitance Measurements
02:15 - Teardown of a new Suntan brand polypropylene X2 film capacitor
03:03 - Different failure modes based on size and winding pressure
05:52 - Unwrapping the film
07:51 - The film inside a NEW film capacitor
09:19 - Teardown of the FAILED uTx brand heater capacitor with half capacitance
10:06 - How Schoopage and the end pin terminations work
12:23 - Teardown continues...
12:45 - WOW! What on earth is this?
14:54 - Elecami Wolf also did a teardown
16:05 - Teardown continues...
17:01 - Separating the film showing both slef-healing and extensive metal film corrosion
18:29 - Another uTx brand failed film capacitor from a Corsair PSU, with 90% loss in capacitance!
Elecami Wolf Youtube Channel: https://www.youtube.com/c/ElecamiWolf
19:55 - Let's call an expert! Ron Demcko from AVX tells us the REAL REASON for the failure!
It's moisture ingress and corona demetallization!
Full discussion with Ron Demcko:
Metallized Film Capacitor Lifetime Evaluation and Failure Mode Analysis report:
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NO SCRIPT, NO FEAR, ALL OPINION. An off-the-cuff Video Blog about Electronics Engineering, for engineers, hobbyists, enthusiasts, hackers and Makers. Hosted by Dave Jones from Sydney Australia.