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Thread: Help! I blew up a resistor!

  1. #1
    Newbie
    Join Date
    Sep 1999
    Location
    Norman, OK, USA
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    48

    Help! I blew up a resistor!

    Hi, I have purchased a Monochrome LCD with Cirrus controler from Allelec. i think many of you guys know what i am talking about. It worked fine, but when I tried to make extensions to the different cables, I did a stupid mistake an blew up a reistor. It still works but it's not as bright as before.
    Anyway, I found wich reistor I blew, It's the resistor R5 at the top left corner of the controller. it has R14 on its right and R6 under it. I need to knoe its resistance, the number writen (or letters) on it.
    Thanks.

    Bakassi

  2. #2
    Variable Bitrate
    Join Date
    Jul 1999
    Location
    Greensboro NC
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    233
    is it a regular resistor or is it surface mount?

  3. #3
    Newbie
    Join Date
    Oct 1999
    Location
    Dayton, OH USA
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    14
    What colors are the rings around the resistor? They will tell you what the value is.

  4. #4
    Newbie
    Join Date
    Sep 1999
    Location
    Norman, OK, USA
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    48
    It's not a regular resistor with bar code on it. It's a smal rectangular thing with numbers written (some have letters) on it. A friend of mine, Electrical Engeneering major told me it's a I think "micro resistor". If somebody else has the same controller... I would wants written on it to start looking for it.
    Thanks for your help.

    Bakassi

  5. #5
    Newbie
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    Sep 1999
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    Norman, OK, USA
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    I know my spelling is terrible,
    I think that getting some sleep would be a good idea too.

    Bakassi

  6. #6
    Low Bitrate
    Join Date
    Sep 1999
    Location
    Kuwait
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    96
    Hey Bakassi,

    I have alreay ordered one of those, When it comes Ill look on the one i will have and see if I can get anything out of it.

    btw how did a reistor blow up while u where making extensions. I dont want to blow up my resistors

  7. #7
    Variable Bitrate
    Join Date
    Jul 1999
    Location
    Greensboro NC
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    233
    Well what you have is a surface mount resistor...and theres really no way to repair it with that proper tools even if you did find out its resistance value....I dont know too much about surface mount componenets but i will ask someone i know (EE degree) about how to get the values from the lettering on it.

  8. #8
    Constant Bitrate
    Join Date
    Oct 1999
    Location
    CA, USA
    Posts
    118
    SMD resistors can be replaced without the proper tools no problem. The easiest way is to use a screwdriver tipped soldering iron to touch both sides of the resistor at the same time and then 'wipe' the resistor off the board. You can do this with a pencil tip too, just not as easily. If all else fails, chip the center section of the resistor off and remove each end separately.

    The real issue though is if the PC traces on the board are still good. If you passed enough current through that resistor, did the traces burn and lift or open up somewhere on the board?

    Finally, this guy doesn't even have the numbers on the part anymore since it burned up.

    About reading SMD resistors, they read like the color coded ones but using numbers instead. read the first two numbers directly, the last number is a power of 10. (example, 472 = 4.7K = 4700, 100 = 10 ohms)

    Precision (1%) SMD resistors have 4 numbers, the last number is still a power of 10.

  9. #9
    Low Bitrate
    Join Date
    Aug 1999
    Location
    San Marcos, Tx, USA
    Posts
    78
    I have that monitor too. I will try to find the resister on my board....

    BTW, what kind of motherboard are you using? The motherboard I got for it won't boot with the video ISA card that comes with the screen.

  10. #10
    Newbie
    Join Date
    Sep 1999
    Location
    Norman, OK, USA
    Posts
    48
    I have a basic Soyo motherboard, 5STM if I remember right, It has audio and video onboad, and supports socket 7 processor up to 300Mhz. I didn't have any problem. But on my motherboeard there is a switch to desactvate the onboard video or audio. You can desactivate them from the SETUP too. Check and try that.
    Let metell you what blew my resistor. You white wires for the backlight; I cut them to make extensions so that I can leave the player in my trunk. I cut them without putting any mark on. I had then two white wires, couldn't distinguish them ----> I guess, I didn't guess right.


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