Is this a fuse? If so, what kind? if not, what is it?

Submitted ⁨⁨11⁩ ⁨months⁩ ago⁩ by ⁨reric88@beehaw.org⁩ to ⁨askelectronics@discuss.tchncs.de⁩

https://beehaw.org/pictrs/image/3501be96-2425-4b5b-a82f-4a6fc341082f.webp

I’m learning about electronic components. I believe this is the part which has broken and made this heating pad unsafe to use. Well, unusable, not just unsafe lol.

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cmnybo@discuss.tchncs.de ⁨11⁩ ⁨months⁩ ago
No, there’s no fuse here. From top to bottom, there is an electrolytic capacitor, zener diode, and a 4MHz resonator.

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- SpikesOtherDog@ani.social ⁨11⁩ ⁨months⁩ ago
  Ding ding ding
  
  For op, ZD means zener diode.
  
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- reric88@beehaw.org ⁨11⁩ ⁨months⁩ ago
  Thank you for your answer. I will continue looking for the fault
  
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ezekielmudd@reddthat.com ⁨11⁩ ⁨months⁩ ago
If anyone is wondering, that glass diode package is called a MELF. I don’t know why.

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- cmnybo@discuss.tchncs.de ⁨11⁩ ⁨months⁩ ago
  MELF stands for Metal Electrode Leadless Face although anyone who has had the pleasure of working with them will tell you it stands for Most End up Lying on the Floor.
  
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  - ezekielmudd@reddthat.com ⁨11⁩ ⁨months⁩ ago
    Hahaha!!! You are soooo very right!!!
    
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Besen@feddit.de ⁨11⁩ ⁨months⁩ ago
If you’re looking for a fault and can’t see it, it’s sometimes possible to sniff it out. Components can be burned out, but the damage is barely visible, if at all. It could be a tiny crack in the packaging. It will often smell like burnt plastic for a long time. Locate the rough area and concentrate on these parts.

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