Diode identificatiion.

[Henriquez]

Hello,
Can somebody identify the diode D3 on the picture?
After googling for weeks now, with my limited knowledge of diodes, trying to go just by the color coding (white-green), I still cannot find something that looks similar.

It is on a VFD display and so far:
- I have verified that it is broken, since it reads 0,058v both ways with multimeter in diode mode.
- I also measured the D3 on a functioning VFD module and that one does read 0.488v one way.

So, if anyone could identify the diode or enlighten me about what else I could be measuring (with a DMM) to find the correct replacement, I'd truly appreciate it.

Many thanks in advance.

[petehall347]

have you removed it to test ?

[Henriquez]

have you removed it to test ?

Thanks for your reaction.
No, I tested it in circuit; I didn't realize that that would make a difference, but I'll remove and measure it tomorrow.

[Henriquez]

have you removed it to test ?

Thanks for your reaction.
No, I tested it in circuit; I didn't realize that that would make a difference, but I'll remove and measure it tomorrow.

I just removed the diode as advised and now it does indeed measure 0.550v correctly.🙂
I also removed the capacitor that this diode is connected to, which was measuring "low capitamce/leaky" while in circuit, and now this one also is reading the right capitance outside the circuit, though with fairly high ESR.

With no schematic of this module to be found and me only having basic experience with mainly audio circuitries, I'm a little at a loss. 😞

[petehall347]

try cleaning that mess on the board and any other messy bits .then look for anything that appears shorted

[Henriquez]

try cleaning that mess on the board and any other messy bits .then look for anything that appears shorted

Will do, thanks again.