Polar 78ES - Replaced display - Only backlight working - no imageset

Discussion in 'Cutters and Trimmers' started by Marlini, Jul 22, 2022.

  1. Marlini

    Marlini New Member

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    Jul 2022
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    South Africa
    Good Day,
    Please can you help. I replaced the Toshiba TLX-1741-C3m display with a new Hitachi TLX-1741-C3m. Based on the specs, the board I purchased is a replacement for the Toshiba. I connected it yesterday. The backlight comes on, but no imageset on the display, everything else works on the guillotine. It did give a few beeps on startup. Can anyone suggest any fixes. The IDC connectors on the board were a bit of a different orientation so I had to make a new ribbon cable to connect from display to the driver board but I checked this wiring and all seems to be as the old board.
    Thanks
     
  2. CHOCK

    CHOCK Senior Member

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    Dec 2016
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    Location:
    Managua,Nicaragua
    Possible the Display is NOT compatible.

    2) However Backlight is o.k

    3) Review +5Vdc +9Vdc in the board of POLAR, if there are in Tolerance 0.7% up or down, otherwise replace or repair.

    4) IF after everything is o.k, Display NOT compatible.
     
  3. Marlini

    Marlini New Member

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    Jul 2022
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    South Africa
    Good Day Chock.

    Thanks so much for the response. I will check the tolerance levels as advised.
    Hoping I can get something.
    Will let you know what the outcome has been.
    Thanks so much
     
  4. CHOCK

    CHOCK Senior Member

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    ok sir
     

  5. Marlini

    Marlini New Member

    Joined:
    Jul 2022
    Messages:
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    Location:
    South Africa
    Good Day, just to give you feedback. The replacement display is working. The new display came with a surface mount potentiometer which needed to be tuned to get the correct contrast. This was done and voila!

    Thanks for the assistance.
     
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