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Help identifying component on a laptop motherboard

Discussion in 'Troubleshooting and Repair' started by MLBZ521, Oct 27, 2012.

  1. MLBZ521

    MLBZ521

    8
    0
    Oct 27, 2012
    Hello all! Obviously my first post here, I just came across this forum during my search today. Probably could have used this place before for other things.

    So what I'm looking at:

    Dell Studio XPS 1555 Laptop - My uncle bought this at a yard sale for cheap, but it had a issue, so he brought it to me to see if I could fix it.

    Symptom: The laptop would power on and work, but randomly make some buzzing and other quirky noises, but after 20 - 30 seconds the display would go static. I only went into the BIOS personally.

    I've had tons of experience repairing desktops, laptops, and other electronics. And so, had a hunch it had liquid damage.

    Took it apart and found the liquid damage I expected. I cleaned it up and tried to power up again, but it will not. However, it will change the battery, so it's not completely toast.

    After checking over the area where the water damage was, I found the culprit. I guess I got a little careless and rough while cleaning.

    Picture can be viewed here. Sorry it's so big...

    On the board it's labeled: PD11
    The component is labeled: KL4 W9
    One of the leads is missing...


    I'm not 100% sure, but thought it may be a diode, which searching, brought me here: http://www.scribd.com/doc/58568740/Diodes-Inc-Marking
    Searched for "KL4" found part number BAT54S.
    And that on Digi-key and Mouser:
    http://www.digikey.com/scripts/dksearch/dksus.dll?vendor=0&keywords=BAT54S
    http://www.mouser.com/ProductDetail...r/BAT54S/?qs=sGAEpiMZZMudZehw8RjeZTifoK6Js1Mn


    So, am I right, wrong, close, no where near?

    I have plenty of board level soldering experience so if I can get a replacement, I should be good. Oh and I do have another circuit board from a TV that has the same looking components on it, but not sure if they'll work or not.


    I appreciate any help offered, thanks!
     
  2. CocaCola

    CocaCola

    3,635
    4
    Apr 7, 2012
    Yes, the KL44 marking is Diodes Inc. marking for the BAT54S, the K indicates the Shangbai Assembly plant with the L44 indicating a part number BAT54S, W9 indicates a manufacture date of September 2009

    http://www.diodes.com/datasheets/ds11005.pdf
     
    Last edited: Oct 27, 2012
  3. MLBZ521

    MLBZ521

    8
    0
    Oct 27, 2012
    Ok thanks!

    So, I'm assuming since the ones on this parts board do not have the same markings, I probably shouldn't use them?

    The markings are:
    W1A 58
    12W 53
    12W 55
    t1A 57
    L43


    Thanks for verifying though!
     
  4. CocaCola

    CocaCola

    3,635
    4
    Apr 7, 2012
    Unless you can cross reference those other parts to BAT54S no they will not work, ignore the package shape and size it's used for MANY different parts, it's what's inside that matters...

    Also note the 'S' in the part number as that is important as it designates the arrangement of the diodes inside the chip...
     
  5. MLBZ521

    MLBZ521

    8
    0
    Oct 27, 2012
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