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Broken SMD - need suggestion for replacement

Discussion in 'General Electronics Discussion' started by fbel, Aug 8, 2014.

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  1. fbel

    fbel

    2
    1
    Aug 8, 2014
    Hello,

    I have a car stereo (Delco model #15766343) that I was trying to trace when I broke a SMD ceramic capacitor. I need a suggestion for possible replacement. The picture shows the capacitor (circled) before it broke off: http://uploads.im/Y5aEb.png.

    Thanks in advance for any help.
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Hello there and welcome to Electronics Point :)

    As you've discovered, capacitance values are not marked on MLCCs (multi-layer ceramic capacitors). You may be able to fix it though...
    • Is it possible to measure the capacitance of the old one?
    • Have you searched the Internet for a service manual or schematic for that unit?
    • Can you read the part number of the quad flatpack IC next to the capacitor, find a data sheet for it on the Internet, and find which pin number it is connected to?
    • You could try a good old 0.1 µF 50V X7R capacitor and hope it works properly.
     
    (*steve*) likes this.
  3. fbel

    fbel

    2
    1
    Aug 8, 2014
    The IC is from Philips and I have not been able to find any data sheets for it, nor any schematics or service manuals for the stereo.

    09375033
    181340
    DPD002902

    Based on the size of a similar capacitor on the board, you are most likely right about it being a 0.1 µF capacitor. Although the stereo works without the capacitor on my workbench, it was there for some reason so I want to replace it.

    I've only been studying electronics for a few months, so thank you for your help.
     
    KrisBlueNZ likes this.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,397
    2,777
    Jan 21, 2010
    If it works without the capacitor it lends weight to the argument that the cap is not there for any critical purpose.

    I would measure the resistance from both ends to the power supply for the IC, it is possible that it is connected across the power supply and thus the cap suggested by Kris would most likely be a suitable replacement.

    Other than that, it may be hard to find out. If a 0.1uF cap doesn't negatively affect operation, it's probably the best you can do as a replacement.

    Oh, if you can find another of these stereos you could measure the cap. I'm not sure how hard that would be though.
     
    KrisBlueNZ likes this.
  5. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    1uf max.... I'd try 0.1uf or 1uf whatever fits, probably just a decoupling cap.
     
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