Electronics > Beginners
a kind of diode?
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perieanuo:
It's a choke, measures almost short-circuit, if not just put a wire instead.
Regards,Pierre


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GeoffreyF:
It is a wire with a ferrite bead on it.  As such it is a choke.  With an ohm meter DC resistance will be the leads + that wire.   At some high frequency, there will be reactive resistance.   The purpose of these in a circuit is usually to prevent spurious high frequencies moving from one part of the circuit to another.

If you ever have seen these mysterious warts around wires going to or from a computer, these are larger chokes and serve the same purpose.

You will likely realize that these beads can move freely around the wire.

There is no concern about heat damaging these devices unless it is literal flame.  If they are hot, it may be that another part of the circuit (or a nearby transmitter) is generating high frequencies that are outside design parameters.
nickeevblog10:
Thank you, i think you have summed the problem up here and I will be removing the transistors about the burned area to test them. I actually want to use the LED panel from this TV, to experiment  the use of an overhead LED light for my workbench. Just for fun at this stage. Thank you.
I think replacing both of the ferrites is a good idea because of the erratic readings when testing.
The blackened one reading more inconsistently than the greyer colored ferrite.
xavier60:
The erratic reading is just because of the surface corrosion on the leads.
nickeevblog10:
oh wow, thank you for that, I will clean them and retest soon,

 *** thank you very much Have a Good Christmas!
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