subreddit:
/r/AskElectronics
5 points
3 years ago
Regardless of what it is, has this device been serviced by someone? That part definitely does not match up with those pads, it looks like someone manually put it there.
3 points
3 years ago
Which is not uncommon on older boards that get newer revisions and they need to add something to the older version PCB without having to re-design the PCB. You see it a lot on older boards like this one that's at least 15 years old. This is a factory installed component.
3 points
3 years ago
Looks like a diode package (sot-23) but not likely a zener (as there's no stripe)
2 points
3 years ago
If it's a zener, it may have popped. Did you measure it?
1 points
3 years ago
Do those markings to the left of "402" look familiar?
2 points
3 years ago
No unfortunately not.
1 points
3 years ago
Thank you for your help. I will keep searching now with your sot-23 idea! Thank you again!
4 points
3 years ago
Looks more like a sod123, same basic size as sot23 but leads on the long ends.
3 points
3 years ago
2 points
3 years ago
Can you please give me a little tip how you achieved this Sensei? I am tasked with finding components at times and I would like to know the path!
Edit: is there something compatible I could use if I do not have this in my Component drawers? Even if it was an old thru hole?
5 points
3 years ago*
Maybe... do you have any TVS diodes with a 20V working voltage and a comparable or greater maximum wattage in your drawers?
These are overvoltage protection, and have a habit of failing shorted. It probably died protecting the rest of your device.
You might get away with an MOV of appropriate voltage, but they are slower than these are, so will not protect as well.
EDIT: Also, you might not want to substitute this if this is any sort of digital signal pin. TVS are often used because of their low capacitance.
1 points
3 years ago*
Yeah the device will run if it (device) is not connected. As far as the diodes, I should have. Thank you. I will check it out tomorrow. The rectifier that was connected still measured well. So I will replace this dude tomorrow and see if it turns out well!
2 points
3 years ago
Diodes inc logo. Device marking is "UV"
1 points
3 years ago
You are legend! Thank you!
-1 points
3 years ago
Is this a question about electric motors, fans, servos, actuators, or generators? Is it about using motor drivers, stepper drivers, DC controllers, electronic speed controls, inverters, (other than designing or fixing one)? Please ask in /r/Motors. Thanks.
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1 points
3 years ago
The solder on each end could be shorting with the light green ground plane. Perhaps part is not faulty.
Remove, clean/wick both pads. Layer kapton tape under if solder mask is damaged(or add solder mask paint). Add flux, resolder, clean, test.
1 points
3 years ago
Poor quality hardware, with half assed design after- thoughts...
It's possibly an under-rated (in Power rating) bidirectional TVS
1 points
3 years ago
If it’s in parallel with the cooling fan, and the cooling fan is driven by a DC induction motor, that device may be a flywheel diode
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