Author Topic: SMD cap ID help  (Read 718 times)

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Offline warrjonTopic starter

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SMD cap ID help
« on: May 31, 2019, 11:20:08 pm »
Hi Folks, My name is Warren I was a bench and metrology tech most of my life, retired now. I have done very little SMD work as most of the gear I worked on was Military and/or Aviation where we had to use OEM parts so my SMD experience is limited.

Anyway my TDS2024 scope decided to turn its toes up. I have identified 3 faulty components 1 cap and 2 transistors. I have IDed the transistors but the cap is eluding me. The ID id J685L  (I make out the 685 is 6.8uF) and polar so either Tantalum or Electro.


 

Offline JustMeHere

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Re: SMD cap ID help
« Reply #1 on: June 01, 2019, 01:11:34 am »
See if you can figure out what it is connected to.  Then see what the datasheet says that component needs.
 

Offline radiolistener

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Re: SMD cap ID help
« Reply #2 on: June 01, 2019, 05:55:52 am »
tantalum smd capacitors usually has yellow color.
 

Offline Nerull

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Re: SMD cap ID help
« Reply #3 on: June 01, 2019, 07:13:00 am »
Plenty of tantalums are black.
 

Offline gamalot

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Re: SMD cap ID help
« Reply #4 on: June 01, 2019, 07:38:23 am »
They are 6.8uF/6.3V tantalum capacitors.
I'm a poet, I didn't even know it. |  https://youtube.com/@gamalot | https://github.com/gamalot
 

Offline warrjonTopic starter

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Re: SMD cap ID help
« Reply #5 on: June 01, 2019, 07:49:26 am »
I thought they were yellow until I dug around RS

https://au.rs-online.com/web/p/tantalum-capacitors/8603815/

I have come up with a plan.

The USB driver has the same cap to ground. I am going to steal it and plug it in where the bad one was and replace the USB cap with one of those from RS.
 


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