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    CF-19 MK4 Keyboard issues

    Discussion in 'Panasonic' started by rickster21, Apr 3, 2014.

  1. rickster21

    rickster21 Newbie

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    Hey everyone, first post here...
    OK so two weeks ago, I bought a CF19 MK4 at a flea market (i know, took the risk!) and it appears everything is in working order except for the keyboard. The enter, right shift and delete keys do not work. I attached a USB keyboard and the keys do work fine off that. Also, I tried in the bios setup screen and the enter key doesnt work there either.
    I went on ebay and bought another keyboard for about $30 and the exact same problem is there.
    I think it's safe to assume the problem is with the connector or possibly a keyboard controller on the motherboard?
    Anyway, I'm curious if anyone has seen this before and can give me some ideas what to try next or if I should just sell the toughbook.
    Thanks!
     
    rickster21, Apr 3, 2014
    #1
  2. SHEEPMAN!

    SHEEPMAN! Freelance

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    Odd.

    The guy with a duplicate of this machine is in Canada...and will be checking in. Hey, Morgan.

    Sometimes problems are caused by caplock, numlock......but that would be evident in extra green lights.

    Check connections on the keyboard pcb....'specially since two keyboards reacted the same. It would be connections between the mobo and keyboard pcb since two KB's are involved.

    Good luck.
     
    SHEEPMAN!, Apr 3, 2014
    #2
  3. unclemack

    unclemack Notebook Evangelist

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    I'd guess resolder connections on the motherboard socket.
    Good luck with it :)
     
    unclemack, Apr 4, 2014
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    onirakkiss likes this.
  4. onirakkiss

    onirakkiss Notebook Deity

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    ^^ correct .Sometimes invisible breaks at the solderpoint.
    Also I want to mention, the problem could also be inside the connector (CN18?) for the flatbed cable. A pin could be corroded or dusty.
    It looks like there is only one row out of order. The keyboard is a matrix of rows and columns.
    How good is ur knowledge about electronic and how good is ur equipment? U can just check the resistance (pull the battery and power first!) between solder point and connector contact (should be near zero), or better: if u really know how to use an oscilloscope u can check the square wave signals at the pins of the connector and behind, also if u press a key. Have a look into the schematic. There should be 16 lines, where u will see a square wave signal also without pressing a key and 8 lines, where u only c a signal, if u press a key.
     
    onirakkiss, Apr 4, 2014
    #4