Can someone name the mystery component?

[Down with Umbrella]

This is a 24VDC control board to an industrial dryer. It accidentally saw 120 VAC.. Oops! Not me.
Either way I volunteered to look at it for a friend. She is very knowledgeable but over worked. Plus she's hot and I like her *cough* I replaced the 220 ohm resistor but I'm not sure what the yellow buoy shaped component is?? Hmm I'm pretty sure the whole thing is toast but they are 400 plus new. The new one is already installed but I have this to play around with.
It actually powers up but doesn't send correct commands (before the fix) the scorched Mark near the chip tells me that could be an issue too.
These boards are handmade by a small town manufacturer somewhere but they will not sell individual parts they gotta make money somehow. My guess that rectangular chip to the left contains proprietary information.
Also I DONT know the full story. I was just brought the board.



Thoughts?
Jefferson

 

[Down with Umbrella]

Google tells me it's a some type solid electrolytic capacitor.
The problem is the values are different per each cap and I can't read the value on that one. It's not popped up so it might have survived.

 

[Cyparagon]

That's an axial-lead tantalum capacitor (not electrolytic). Desolder one end from the circuit, and measure the resistance. If the resistance is infinite, the cap is likely fine and can be re-soldered into the circuit.

You said there is a replacement board installed. Why not look at the value in the replacement?

 

[Down with Umbrella]

Thanks Cyparagon, I'll give that a try.
Quick question while you're weighing in, is there an advantage to using this specific capacitor vs another polarized style cap?

 

[Cyparagon]

Tantalum caps are lower ESR than electrolytics. They also have a superior frequency response, can operate over a wider temperature range, and have an almost unlimited life. Electrolytics are only rated for a few 10,000 hours at most. The main disadvantages would be lower capacitance availability, the voltage ratings available are lower, and they are more expensive.

 

[lazeristasUVISIR]

The shape of the burnt one looks very similar to yellow ones on left. 85% chances that they all have the same value

 

[ped]

To me it looks like a thermal fuse..but it's discoloured due to the adjacent bonfire :crackup:

But it has no place there, they are normally clamped to heatsinks or other heat producing components that require protection.

Iv'e never actually seen an Axial lead tant, didn't even know they existed , follow Cyp's advice, that should tell you what it is.

 

[Down with Umbrella]

When I googled the part number it spit me out this data sheet.
http://www.vishay.com/docs/40019/173d.pdf

Unfortunately, as of this morning I dont have the board right in front of me.
I need to verify the numbers are correct and correspond to all three which I can do by desoldering.

According to the data sheet if I can read part of the numbers I should be able to ascertain capacitance values and surely the 50v rating must be the same.

 

[Benm]

I'm guessing it's a capacitor, though there are fuses in very similar casings - probably best to draw part of the circuit schematic to make sure which one makes most sense.

If it is a capacitor you can at least put in a normal electrolytic to see if the board works with that. It might be a bodge to do so, but it could work for some time (or even forever) so there is little to lose.

In case you cannot read the value on it at all just go for something like 1 uF / 50V and see what happens if you are sure it is a capacitor.

Also run the board from a lab supply with current limiting in case you screwed up and figured it was a fuse after all and just bridged it to see if the board is salvagable at all