Re: What kind of part is this?
- From: "Arfa Daily" <arfa.daily@xxxxxxxxxxxx>
- Date: Fri, 27 Jan 2006 10:48:54 GMT
"Isaac Wingfield" <isw@xxxxxxxxxxx> wrote in message
news:isw-359E52.20221126012006@xxxxxxxxxxxxxxxxxxxxxxxxxxx
> Working on a sony PSOne video display with no documentation.
>
> First problem was a tiny fuse of some sort; it was open. Shorted it with
> a wire. From the way the power supply was behaving (pulsing on and off),
> I decided that some component had shorted, ant that's what took the fuse
> out.
>
> By some judicious cutting of traces, I was able to isolate one component
> that was shorted (it connecetd between the voltage bus and ground), and
> by cutting one of the traces to it, the whole display fired up and
> seemed to work just fine.
>
I would say that it is almost certainly a diode, and if it's right after the
fuse, on the main feedline coming in from the power supply, then its purpose
will be reverse polarity protection - and it's probably done its job. Ask
the owner if they tried a " wrong " power supply in it ...
Assuming that it is a diode, and even being a surface mount type, it should
have some kind of polarity marker on it, either a stripe at one end, or a
chamfer on the case, then any general spec surface mount silicon power diode
will do. It would probably be rated something like 100v, 1 amp. It
should be connected cathode to rail, anode to deck, so that it is not
conducting under normal circumstances.
Arfa
> Now I need to know what that part is so I can replace it.
>
> It looks like a black rectangular tantalum surface-mount cap, except the
> the letters printed on it, and the component designator on the board by
> it, aren't right.
>
> There's one obvious tantalum cap on the board. Its designator is "CP1";
> this thing is "DP1", and on it are some odd symbols followed by "133",
> and below that the letters "ZHU".
>
> If it were a capacitor, then one of the two would be "CP2", but this is
> "DP1".
>
> So I'm thinking "diode", but I have no idea what specs it should have.
>
> Note again that the display is working fine without it, but still, I'd
> like to get it fixed properly.
>
> Any idea what it is?
>
> thanks, Isaac
.
- References:
- What kind of part is this?
- From: Isaac Wingfield
- What kind of part is this?
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