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I need to find out what surface mount this is its black with a Y on it enter image description here

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  • \$\begingroup\$ what was the voltage across it when powered? what is the resistance across it when board is off? what does the silk screen in white font legend say? \$\endgroup\$
    – User323693
    Jan 25, 2017 at 4:12
  • \$\begingroup\$ one side reads 19v other side reads 0v i was thinking it was a fuse but seen there is a cap beside it soldered to same traces \$\endgroup\$ Jan 25, 2017 at 4:40
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    \$\begingroup\$ what does the silk mark say? like C22 and F20. what is the package? can you open it from the PCB and measure resistance across it? \$\endgroup\$
    – User323693
    Jan 25, 2017 at 5:27
  • \$\begingroup\$ What package size is it? \$\endgroup\$
    – winny
    Jan 25, 2017 at 9:01

1 Answer 1

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Going by look and reference designator (F20, mirrored in the OP’s image), it seems to be fuse. One of the fuse from Bourns can match it. Further confirmation can be made by inspecting the resistance of it. looking at the copper trace width, it looks like power plane. See the image below:

enter image description here

Datasheet: http://www.bourns.com/docs/Product-Datasheets/sf0603f.pdf

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    \$\begingroup\$ Why would you put a fuse in parallel with a capacitor? \$\endgroup\$
    – winny
    Jan 25, 2017 at 9:00
  • \$\begingroup\$ @winny not 100% sure whether it is Fuse and the component next to it is a capacitor too.. only OP have to confirm at least the resistance of component of interest. Even, resistors come now without marking. \$\endgroup\$
    – User323693
    Jan 25, 2017 at 11:21
  • \$\begingroup\$ I find a resitor far far more plauisble than a resistor due to said capacitor and the resonable asumption that this is not the "start"/input of the circuit, more and RC in the middle of the schematic. \$\endgroup\$
    – winny
    Jan 25, 2017 at 11:35
  • \$\begingroup\$ @winny if it was indeed a resistor it could be for some fuse blown indication through a LED down the line. \$\endgroup\$
    – User323693
    Jan 25, 2017 at 11:45

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