Polar 92 E Backlight from TFT Screen defect

Discussion in 'Cutters and Trimmers' started by grafische, Sep 5, 2018.

  1. grafische

    grafische Member

    Joined:
    Mar 2015
    Messages:
    22
    Location:
    Austria/Vienna
    We have the Problem that the backlight from the TFT screen is defect.
    There is an small inverter card beside the screen where we saw that the blue ceramic capacitor, 22pF 3kV, was blown. We changed the capacitor against a new one but we had no success. The light was a short moment in function and than the capacitor was blown again.

    The Problem is that we don't want to Change the whole screen concerning this fault which could Maybe fixed.

    Any ideas
     
  2. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    1,064
    Location:
    Managua,Nicaragua
    Hi, sir you must test the power supply for the inverter if is o.k, see his schematic diagrams
    2) after you must test some Transistors, diode, or brige rectifier if there are in Short circuit
    and replace.
    2a) if you do not have the experience and knowledge in electronic, Go:
    3) Any Tech TV, can do that, that is normal in LCD TV, Monitors, i recommend you that you take your whole
    TFT screen and go to the repair shop, since they are skill to handle the level components.
    Let me know.
    Blessing
    superchock@yandex.com
    cell+WhatsApp: +505 88611441
     
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