How to test UDN6118 IC's?

(Topic ID: 230993)

How to test UDN6118 IC's?


By joemagiera

12 days ago



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  • 4 posts
  • 4 Pinsiders participating
  • Latest reply 12 days ago by barakandl
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    #1 12 days ago

    I picked up a small stash of UDN6118 ICs. They are all pulls. They seem to be fairly expensive ICs. Is there any way to test these IC's other than populating them on a board of one of the pinball games that use them? If so, how? Thanks,

    Action Pinball lists the games that use them:
    http://www.actionpinball.com/parts.php?item=UDN6118A

    Does anyone know if the UDN6118's are socketed on any of those games? I certainly don't want to mess with desoldering an IC just for testing. Hopefully there's another way to test them.

    Joe (joemagiera at ameritech dot net)
    joemagiera@ameritech.net

    #2 12 days ago

    Something like this maybe?

    amazon.com link »

    #3 12 days ago

    There is a testing procedure in the pinwiki system 9/11 troubleshooting guide.

    #4 12 days ago

    These are high voltage interfacing chips. Logic level voltage goes in. High voltage level comes out.

    you can, with extreme care probing around high voltage, check that the input matches the output. Even with a DMM on avg voltage you can get a good idea if one is blown by comparing others in display test. It might be safer to probe at an unplugged connectors than on the chip itself.

    If you pull the high voltage fuse you can see what comes out the outputs. It might spit out 5v logic level out in that case and you can use a logic probe to check input vs output activity.... never tried that.

    Rudimentary testing with power off is not going to fool proof but that could find for sure dead chips. There is probably many transistors cascaded in a row. Diode test could probably detect if the last transistor before output or the first one on input is bad, but be isolated from testing the middle transistors in the cascade.

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