(Topic ID: 305996)

Smoked UDN184 on williams system 6

By southofi-10

1 year ago

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    #1 1 year ago

    I'm having a segment missing problem on my Laser Ball Williams system 6. I checked all the resistors which were all in vlue,so I changed the udn184 display digit driver.
    Turned it on and it smoked.Not sure if this happened before that created this problem and I just didn't notice.
    Going to change IC5 next.Hoping that is the issue.
    Anybody know why the chip would smoke.
    I did put in a socket.Work looks Ok

    #2 1 year ago

    Some possibilities:
    Are you certain the IC was oriented correctly?
    It could have been a defective IC
    "The work looks ok" doesn't mean much - use a meter to check all connections.

    #3 1 year ago

    Ill revisit the board. Looks Ok I meant I have changed several chips without any problem and I inspected the board closely after smoke and it "looked ok"
    So I have 2 extra chips I'll try and replace this one soon.
    Thank you

    #4 1 year ago

    Ok. I figured it out.
    I installed the wrong chip. Not only that,I had ordered the wrong chip in haste.
    So I installed the chip I got without double checking.
    This is what I got for being in a hurry to get machine back you.
    Lesson learned....


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