Hey guys! I was repairing this SMPS & came across this component(http://s9.postimage.org/gwv6raaun/find.jpg). I was wondering what is this component. I think its inductor. Not sure.
This catalog is useful. So its a power thermistor. Thanks buddy!Looks like this one:
http://www.datasheetarchive.com/dl/Datasheets-30/DSA-588185.pdf
It's a pdf catalog from Semitec. Open the document and search for "16D-13".
It's on page 23.
Are you measuring this "in-circuit"? If so, is the NC pin connected to anything via a trace?It is showing short between cathode & NC, collector & other NC http://s16.postimage.org/xk6qy3891/TLP.jpg. So I was wondering is it needs to be replaced?
Yes I measured in the ckt. But there are two. One is showing short & another is not. I identified faulty components one resistor(1000MΩ) shorted, FET shorted& one zener shorted. Lets see.Are you measuring this "in-circuit"? If so, is the NC pin connected to anything via a trace?
If you are you trying to troubleshoot this SMPS I would start by looking for obviously blown components, then leaking/bulging electrolytic capacitors.
Then check for obvious short circuits on output voltages/rectifiers/regulators and primary side power switches (FETs) and switching regulators.
If nothing is found then start to draw a schematic, makes further troubleshooting much easier. An isolation transformer and oscilloscope will help.
I don't think the short between NC & one terminal will cause any harm. And it is a optocoupler.More than never with mass-produced power electronics,
if one components fails, and you repair it,
soon the rest will also follow.
Isn't clear from the thread if this is for repair,
but check the age, and carefully examine all parts of sub-circuit.
If appreciate, replace all.
These NC shorts are nothing to rely on, even if the datasheet says not connected explicitely. There might be different revisions, or special edition for mass product. You need to check the function of the part.
Measuring in-circuit will most likely confuse you, especially when the circuit is unknown.Yes I measured in the ckt. But there are two. One is showing short & another is not. I identified faulty components one resistor(1000MΩ) shorted, FET shorted& one zener shorted. Lets see.
Resistor(Brown Black Grey) I De-soldered first & then measured it(4Ω or 20Ω don't remember exactly what it was), same for FET. But I didn't De-solder optocouplers(two are there). But both are symmetrically connected so both should give same readings!Measuring in-circuit will most likely confuse you, especially when the circuit is unknown.
Did you mean you had an resistor of 1GOhm which is shorted? First I don't know what a 1GOhm resistor would do in a SMPS and then resistors usually do not short, when damaged their resistance increases or varies a lot with temperature.
Or did you mean a low resistance which increased up to 1GOhm? That would of course be a faulty component.
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