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Hello,

 

Does anyone know what the following part is? I have been troubleshooting a defect Sonos Sub and it is not working. 
 

I suspect it to be a kind of diode as it’s marked as D6. However, there is no marking on the part itself. When I check the voltage drop with diode measurement with a multimeter, it’s 0V and it is short circuited when checking the continuity, regardless of polarity. The part is right behind the transformer. 
 

I am trying to find a suitable replacement but I am stuck unfortunately. 
 

Please see attached image. Thank you. 

Odd that there are not markings. Does it seem as if the markings were deliberately masked? If so, you may be able to remove the mask with a solvent. Of course this assumes that the solvent will not also remove the underlying markings if any exist. You could test potential solvents along the edges.

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