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Thread: ISA-486SV2 Keyboard interface error

  1. #1

    Question ISA-486SV2 Keyboard interface error

    Hi there!

    Whenever i start the computer, the BIOS loads and i always get a Keyboard error message. I tried out different keyboards, different keyboard settings (on the keyboard), different BIOS chips and different Keyboard BIOS chips, but i still always get the Keyboard interface error or just a keyboard error.

    What can i do?

    Thank you in advance,

    ZapdoZ

  2. #2

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    Check for battery leakage and board damage from it.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  3. #3

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    The battery is leaked and you can see some board damage. images provided
    IMG_20190114_184602.jpg
    IMG_20190114_184616_1.jpg
    IMG_20190114_184627.jpg

  4. #4

    Default

    That might be the problem. Try checking the traces to the keyboard connector for continuity. If you find one or more that are discontinuous solder a jumper across the discontinuous area(s). See if that helps.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  5. #5

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    Is it possible to desolder the Battery?

  6. #6
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    Not only possible, but recommended. If necessary, you can clip the leads at the board--that will make desoldering easier. Look around the board for a 4-pin header (usually missing one pin) for attaching an external battery (after you've got the corroded traces patched). If those are present, you don't even need to remove the clipped-off battery leads.

  7. #7
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    Is the square metal shield on the front of keyboard connector still attached to the motherboard or have the 2 legs broken? You need that ground intact.
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  8. #8
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    I have the same motherboard, and used it for the diagram at [here].

    Per the diagram, after you have removed the leaking 'internal' battery, and repaired any damage, fit an appropriate 'external' battery to the 'BCON1' connector, and change the 'INT/EXT' jumper to the 'EXT' setting.

    For an idea of what can be fitted to the 'BCON1' connector, see the options at [here].


    The 'gunk' from the leaking battery can get into all kinds of places, so look carefully. An example photo is at [here].


    Quote Originally Posted by ZapdoZ View Post
    ... but i still always get the Keyboard interface error or just a keyboard error.
    I will look for my motherboard and see what the error message is for:
    1. Keyboard controller removed (simulating non-responsive keyboard controller, or its poor connection to motherboard); and
    2. No keyboard (kind of simulating broken traces, etc. in the path from controller to keyboard socket)

    Because different BIOS' can give different error messages/codes, I will also provide details of the particular BIOS fitted to my motherboard.

  9. #9
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    Quote Originally Posted by modem7 View Post
    I will look for my motherboard and see ...
    I cannot find the motherboard.

  10. #10

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    Thank you all so much!

    I found three broken traces and set a jumper to replace all of them.

    Now I can finally get into the system BIOS and the keyboard errors is gone!

    IMG_20190118_163050.jpg

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