This board was pulled from my sisters mini cooper and i am having trouble figuring out what these burnt components are. Its the little ones that have the "ON" symbol and "146 MK" written on them. Thanks in advance.

http://imageshack.us/photo/my-images/109/bbkw.jpg/
http://imageshack.us/photo/my-images/27/6ae7.jpg/

 

Just a guess, but they look like these, 600Watt power zeners - http://www.google.com/url?sa=t&rct=...C1LMTlcEno4cI_GOF0fBjpA&bvm=bv.50768961,d.b2I

Check page #3 of the PDF in the chart under "MK" for the values. If you attempt replacement, make sure you keep the correct orientation (the white bar on one end) when doing it.

 

It appears that only one component is burnt and the others are just discolored from the burned one outgassing (or burning). My best guess is that its a tantalum capacitor, and using a DVM on the diode test setting, you can test the ones on either side and see if they are diodes.

Maybe somebody else can decode the value and voltage rating of the capacitor.

 

Thanks for your input. I guess some of the components will need to be removed before they can be tested. I'll get onto it asap and post what I find. Also if anyone can decode the markings it'd be much appreciated.

 

It appears that only one component is burnt and the others are just discolored from the burned one outgassing (or burning).

http://imageshack.us/photo/my-images/27/6ae7.jpg/

 

Just a guess, but they look like these, 600Watt power zeners - http://www.google.com/url?sa=t&rct=...C1LMTlcEno4cI_GOF0fBjpA&bvm=bv.50768961,d.b2I

Check page #3 of the PDF in the chart under "MK" for the values. If you attempt replacement, make sure you keep the correct orientation (the white bar on one end) when doing it.

Had a look and couldn't match up any form of zener diode code to the numbers "146" written on the case??

 

You could send the image to ON Semiconductors and ask what they are.

 

You could send the image to ON Semiconductors and ask what they are.

That's where I was thinking. ON semi is still in business and they might answer. Meanwhile, you have half a dozen samples that are the same marking and not burnt. Do what tests you can for 2 legged devices, like, "diode? capacitor? zener?".

 

You could send the image to ON Semiconductors and ask what they are.

Just emailed them and am currently waiting for reply.

 

That's where I was thinking. ON semi is still in business and they might answer. Meanwhile, you have half a dozen samples that are the same marking and not burnt. Do what tests you can for 2 legged devices, like, "diode? capacitor? zener?".

I'm gonna need to learn how to test them and i'll need to pull the board out again before i can test the components but if i don't get a response from ON semiconductors then thats what i'll have to do.

 

I thought shortbus gave you a precise identification with specifications in his link.

 

It appears that only one component is burnt and the others are just discolored from the burned one outgassing (or burning). My best guess is that its a tantalum capacitor, and using a DVM on the diode test setting, you can test the ones on either side and see if they are diodes.

Maybe somebody else can decode the value and voltage rating of the capacitor.

I use SMD tants a lot in size B/C/D and they look a bit different to that, also I have never seen an ON Semi brand tantalum, I though ON Semi only make semis?

A SMD cap marked 106 is very common (10uF) but I have never seen the cap value or marked code "146"! These seem to be all over the PCB which seems unusual to have 14uF tant caps everywhere...

Like you said a meter set to diode test would help a lot, but if we are guessing my vote goes for diode.

 

I thought shortbus gave you a precise identification with specifications in his link.

The datasheet he provided stated what MK represents for the power zeners, but the other designation (146) has no corresponding representation. For power zeners, the other designation is a 4 place alphanumeric code for location and the date of manufacture.

 

The 146 is probably a date or factory code. The link shows a component that looks identical. They use a letter code to give the identification, page #3 of the link breaks it down for you.

 

The 146 is probably a date or factory code. The link shows a component that looks identical. They use a letter code to give the identification, page #3 of the link breaks it down for you.

So how do I determine its size. Would the dimensions of the component help?

 

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